Alkali slag foamed concrete sound absorption material and preparation method thereof

A kind of alkali slag foaming concrete sound absorbing material and its preparation method

Technical field

[0001] The present invention relates to the field of building materials and relates to sound absorbing materials, and more particularly to an alkali slag foaming concrete sound absorbing material and a method for producing the same.

Background technique

At present, noise pollution has become one of the major environmental problems of urban residents' complaints. To reduce the impact of noise on the surrounding environment and human beings, sound absorption is one of the important measures to improve indoor sound quality and control noise. According to the difference of sound absorption mechanism, sound-absorbing material can be divided into porous sound-absorbing material and resonant sound-absorbing structure (perforated plate) two categories. Porous sound-absorbing material is mainly mineral wool, glass wool, blankets, wood wire sound-absorbing panels, etc., has a good high-frequency absorption, production is simple, but its fire, moisture and poor corrosion resistance. The resonant sound absorption structure (perforated plate) is generally made of gypsum board, FC board (fiber cement board), metal plate, wood, polyester fiberboard and other materials, these sound-absorbing materials such as gypsum board is easy to lead to poor durability, Metal plate high cost, difficult to control the process conditions and easy to corrosion, wood and polyester fiberboard fire performance is poor, easy to aging, not only a lot of waste of raw materials, but also pollute the environment, endangering health. Therefore, the development of a green and low cost, high durability of the sound-absorbing material for the railway, subway, highway separation, sound-absorbing wall, great market space.

[0003] Alkali slag foaming concrete is based on alkali metal compounds and ground water quenched blast furnace slag as a main component of a hydraulic cementitious material, is also recognized at home and abroad the twenty-first century the most development potential of the cement one. Alkali slag cementitious material is easy to obtain high strength and the late strength of steady growth, hardening fast, early strong, excellent pore structure, water resistance, anti-freeze-thaw and other characteristics. Id age strength of up to 40MPa ~ 70MPa; its hydration heat is only ordinary Portland cement 1/2 ~ 1/3; mortar wear resistance than ordinary cement mortar twice; good insulation, impermeability 4. OMPa, frost resistance of 300 ~ 1000 times freeze-thaw cycle, immersed in 2% magnesium sulfate solution after two years of strength growth, to meet the industrial and civil construction, roads, bridges, harbor, military and nuclear radiation protection Construction needs.

[0004] Compared with the commonly used foam concrete Portland cement sound-absorbing material, alkali slag cementitious material to granulation blast furnace slag, iron slag, phosphorus slag, lithium slag, fly ash and other industrial waste and by-products as the main raw material , Accounting for more than 85% of its total quality. Foam concrete Portland cement sound-absorbing material production can be summarized as "two grinding a burning" process, mainly in three steps, first solidified raw materials into raw materials, followed by high temperature calcined raw material raw materials, and finally clinker mill Fine into the provisions of the fineness, unit production and high energy consumption, and the preparation process is complex. In recent years, with the implementation of national energy conservation policies, energy and resource constraints, environmental problems become increasingly prominent today, the development of alkali slag cementitious materials potential application is more meaningful.

The contents of the invention

[0005] The present invention provides a green, low cost and durable alkali slag foaming concrete sound absorbing material in view of the shortcomings and shortcomings of the prior art.

[0006] Another object of the present invention is to study a process for the preparation of a sound absorptive material to provide a low energy consumption and environment-friendly method for preparing a radioactive material for alkali slag foaming concrete.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A kind of alkali slag foaming concrete sound absorbing material comprising granulated blast furnace slag, alkali activator, foaming agent, catalyst, foam stabilizer and cleavage agent, wherein each component is by weight percentage: granulation Blast furnace mine _ 57. 16 ~ 60. 76%: alkali activator 14. 42 ~ 21.54%: foaming agent 0.35 ~ 1.26%

[0009] Catalyst 0.03 to 0.06% Blowing agent 0.69 to 0.73% Cracking agent Θ~1, 16%

Wherein the alkali residue slag gel component is granulated blast furnace slag, the alkali activator is one of water glass and sodium hydroxide, or the sodium carbonate is in the range of 500 kg / m3 to 930 kg / m3, Wherein the foaming agent is hydrogen peroxide, the catalyst is potassium permanganate, the foam stabilizer is calcium stearate, and the inhibitor is one of polypropylene fiber and polyvinyl alcohol fiber Or two combinations; and, during the production, add 18.5% to 23.57% by weight of water.

[0011] Further, the weight ratio of the water glass and sodium hydroxide composition is water glass: sodium hydroxide = 1: 5-10.

[0012] Further, each component of the alkali-slag foamed concrete sound absorbing material is, by weight percentage, granulated as blast furnace slag 58.88%, sodium hydroxide 18.46%, water 21.53%, hydrogen peroxide 0.35% Potassium 0.06%, calcium stearate 0.71%, polypropylene fiber 0.01%; and the alkali slag foam concrete has a bulk density of 928 kg / m3.

Further, the specific surface area of ​​the granulated blast furnace slag is 452 m3 / kg, the density is 2.91 g / cm3, the basicity coefficient Mo = 1, the activity coefficient Ma = O. 45, the mass coefficient Mk = 1.76; The chemical composition is as follows: Si02 is 32.71, Al2O3 is 14.69, Fe2O3 is 0.76, MgO is 10.77, CaO is 36.22, Na2O is 0.56, K2O is 0.26, The burn loss is 1.36.

[0014] The preparation method of the alkali-slag foamed concrete sound-absorbing material comprises the following steps:

[0015] SI, the granulated blast furnace slag and the foam stabilizer are stirred into the mixer for 2-3 minutes, and the granulated blast furnace slag is 57.16 to 60.76% by weight, and the foam stabilizer is Calcium carbonate and 0.69 to 0.73% by weight; the specific surface area of ​​the granulated blast furnace slag is 452 m3 / kg, the density is 2.91 g / cm3, the basicity coefficient M0 = 1, the activity coefficient 1 = 0.45, the mass The coefficient is Mk = 1.76; the chemical composition is as follows: SiO2 is 32.71, Al2O3 is 14.69, Fe2O3 is 0.76, MgO is 10.77, CaO is 36.22, Na2O is 0.56, K2O is 0 26, the loss of ignition is 1.36;

[0016] S2, the base activator, the catalyst and the water are mixed in a ratio and stirred to form a solution, and the resulting solution is poured into the powder obtained in step Sl and sufficiently stirred for 45 seconds to prepare a slurry. The alkali activator is Water glass, and sodium hydroxide in an amount of 14.42 to 21.54% by weight, the catalyst being potassium permanganate and 0.03 to 0.06% by weight, the water being, by weight, 18.05 to 23.57%;

[0017] S3, the slurry obtained in the step S2 is mixed with the slurry obtained in Step S2 for 15 seconds, and then the foaming agent is added and the IOs are thoroughly stirred to prepare a foamed slurry. The cleavage agent is polypropylene fiber and polyvinyl alcohol One or both of the fibers in the range of 0 to 1.16% by weight, said blowing agent being hydrogen peroxide and 0.35 to 1.26% by weight,

[0018] S4, the foaming slurry was prepared by pouring the foaming slurry into the test mold and the mold was released for 24 hours. The mold release was put into a standard curing room for 28 days;

[0019] S5, the test piece completed in step S4 was perforated, wherein the hole depth was 10-15 mm, the pore size was 5 to 10 mm, the hole pitch was 15 mm, the perforation rate was 6.25-25%, and the material thickness was 20-60 mm The alkaline earth slag foaming concrete sound absorbing material.

[0020] Further, in the step Sl, the granulated blast furnace slag is 58.88% by weight and the calcium stearate is 0.71% by weight; in the step S2, the sodium hydroxide is, by weight, 18.46%, potassium citrate 0.06%, water 21.53%; in step S3, 0.01% by weight of polypropylene fibers and 0.35% of hydrogen peroxide in percent by weight; and the alkali slag foaming concrete Bulk capacity of 928kg / m3.

[0021] Further, the blowing agent time in step S3 is controlled within 5 s.

The invention has the advantages of the beneficial technical effect of the invention: 1) The invention adopts the alkali slag foaming concrete as the sound absorbing material to solve the problem that the common portland cement is used as the acoustic material in the production process; the production process of the alkali slag material Greenhouse gas is only about 10% of the traditional cement building materials, low carbon and environmental protection; alkali slag cement environmental comprehensive evaluation results show that the comprehensive performance of alkali slag is 19.8% of the silicate, in the production and application of the environment has a good Of the coordination; the same time, a wide range of raw materials, low prices, suitable for research and development and promotion. 2) The low-carbon production process of the invention can effectively utilize industrial by-products without generating new pollution. Compared with the traditional two-burn-one process of traditional silicate cement sound-absorbing material, the production process of the invention is mainly "A mill", that is, solid-state dispersed phase grinding, no longer high-temperature calcination of the high energy consumption process, the unit production of energy consumption is only about 30% of the traditional, simple process, low energy consumption, and greenhouse gas emissions, Has great economic value and social benefits, in line with the requirements of economic sustainable development. 3) alkali slag foaming concrete is a porous lightweight material, there are a large number of closed pores, is not conducive to noise absorption, the invention to meet the requirements of mechanical properties of the material made of perforated perforated plate, so that sound absorption better The 4) The product of the invention is prepared by chemical foaming technology. Compared with the traditional physical foaming and aerated concrete, the technology can make the foam in the obtained foam concrete even more uniform and the stomatal continuity is good. 5) The preparation method of the invention has the advantages of short mold removal time and high utilization rate of template, and the sample can not be cured by high temperature and high pressure steam, which simplifies the molding process and reduces the cost.

Description of the drawings

[0023] Fig. 1 is a flow chart showing the preparation process of the alkali-slag foamed concrete sound-absorbing material of the present invention.

detailed description

[0024] The present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0025] Example 1:

[0026] - a kind of alkali slag foaming concrete sound absorbing material, in which the components by weight percentage: granulated blast furnace slag 60.76%, water glass 14.7%, water 23.28%, hydrogen peroxide 0.36%, high acid potassium 0.06% , 0.73% of calcium stearate, 0.11% of polypropylene fiber;

[0027] wherein the alkali slag foamed concrete has a bulk density of 894 kg / m3.

[0028] A method for preparing an alkali-slag-foamed concrete sound-absorbing material, comprising the steps of:

[0029] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 3min, mixed evenly;

[S230] S2, the water glass, potassium permanganate and water were mixed in a ratio, and the mixture was stirred to form a solution. The resulting solution was poured into the powder obtained in step Sl and stirred for 45 seconds to prepare a slurry.

[0031] S3, the polypropylene fiber and the slurry obtained in step S2 were mixed and stirred for 15 seconds, and then the mixture was stirred for 10 seconds by adding hydrogen peroxide in 5 seconds to prepare a foaming slurry;

[0032] S4, the foaming slurry was prepared by pouring the foaming slurry in step S3, and the mold was released for 24 hours after molding. The mold was put into a standard curing room for 28 days.

(Hole depth: 10 mm, pore size: 8 mm, hole pitch: 15 mm, punching ratio: 16%, material thickness: 60 mm), that is, the earthmaking slag, the foamed concrete, material.

[0034] Example 2:

[0035] An alkali-slag-foamed concrete sound-absorbing material in which the components are expressed by weight percent of blast furnace slag 59.39%, water glass and sodium hydroxide 18.1%, water 20.94%, hydrogen peroxide 0.36% Potassium chloride 0.06%, calcium stearate 0.71%, polypropylene fiber 0.44%;

Wherein the weight ratio of the water glass and the sodium hydroxide composition is water glass: sodium hydroxide = 1: 8, and the bulk density of the alkali slag foamed concrete is 928 kg / m3.

[0037] A method for preparing an alkali-slag-foamed concrete sound-absorbing material, comprising the steps of:

[0038] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 3min, mixed evenly;

[S239] S2, water glass and sodium hydroxide, potassium permanganate and water were mixed according to the ratio, and the mixture was stirred to form a solution. The resulting solution was poured into the powder obtained in step Sl and stirred for 45 seconds to prepare a slurry.

[0040] S3, the polypropylene fiber and the slurry obtained in step S2 were mixed and stirred for 15 seconds, and then the hydrogenated water was stirred for 10 seconds, and then the foaming slurry was made.

[0041] S4, the foaming slurry was prepared by pouring the foaming slurry into the test mold, and the mold was released for 24 hours after the molding. The mold release was placed in a standard curing room for 28 days;

(Hole depth: 10 mm, pore size: 8 mm, hole pitch: 15 mm, perforation ratio: 16%, material thickness: 60 mm) was measured, that is, the test piece of the clay material.

[0043] Example 3:

[0044] - A kind of alkali slag foaming concrete sound absorbing material, wherein each component is divided into by weight percentage of granulated blast furnace slag 58.88%, sodium hydroxide 18.46%, water 21.53%, hydrogen peroxide 0.35% %, Calcium stearate 0.71%, polypropylene fiber 0.01%;

[0045] wherein the alkali slag foamed concrete has a bulk density of 928 kg / m3.

[0046] A method for preparing a raw material of a soda ash slag concrete, comprising the steps of:

[0047] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 3min, mixed evenly;

[S248] S2, sodium hydroxide, potassium permanganate and water were mixed in a ratio, stirred to form a solution, and the resulting solution was poured into the powder obtained in step Sl and sufficiently stirred for 45 seconds to prepare a :

[0049] S3, the polypropylene fiber and the slurry obtained in step S2 were mixed and stirred for 15 seconds, and then the hydrogen peroxide was stirred for 5 seconds to make the foaming slurry.

[0050] S4, the foaming slurry was prepared by pouring the foaming slurry into the test mold, and the mold was released for 24 hours after the molding. The mold was placed in a standard curing room for 28 days;

(Hole depth: 10 mm, pore size: 8 mm, hole pitch: 15 mm, punching ratio: 16%, material thickness: 60 mm) was measured, that is, the test piece of the clay material.

[0052] Example 4:

[0053] An alkali-slag-foamed concrete sound-absorbing material in which the components are, by weight percentage, granulated blast furnace slag 58.62%, sodium hydroxide 21.44%, water 18.39%, hydrogen peroxide 0.35% %, Calcium stearate 0.7%, polypropylene fiber 0.44%;

[0054] wherein the bulk slag foam concrete has a bulk density of 930 kg / m3.

[0055] A method for preparing a sound absorbing material of a soda ash slag concrete comprises the following steps:

[0056] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 3min, mixed evenly;

[S257] S2, mixing sodium hydroxide, potassium permanganate and water in a ratio, mixing and forming a solution, and then pouring the resulting solution into the powder obtained in step SI for 45 seconds to prepare a :

[0058] S3, the polypropylene fiber was mixed with the slurry obtained in Step S2 for 15 seconds, and then 10S was thoroughly stirred by adding hydrogen peroxide in 5 seconds to prepare a foaming slurry;

[0059] S4, the foaming slurry was prepared by pouring the foaming slurry in step S3, and the mold was released for 24 hours after molding. The mold was put into a standard curing room for 28 days.

(Hole depth: 10 mm, pore size: 8 mm, hole pitch: 15 mm, perforation ratio: 16%, material thickness: 60 mm) was measured, and the test piece was subjected to drilling (step 6) material.

[0061] Example 5:

[0062] An alkali slag foaming concrete sound absorbing material in which the components are by weight percentage: granulated blast furnace slag 58.70%, water glass 21.47%, water 18.17%, hydrogen peroxide 0.65%, high acid potassium 0.03% , Calcium stearate 0.7%, polyvinyl alcohol fiber 0.28%;

Wherein the bulk density of the alkali slag foamed concrete is 737 kg / m3.

[0064] The preparation method of the alkali-slag-foamed concrete sound-absorbing material comprises the following steps:

[0065] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 2min, mixed evenly;

[0066] S2, the water glass, potassium permanganate and water by mixing ratio, stirring evenly after the formation of the solution, and then the solution into the step Sl the powder was stirred for 45s, made of slurry;

[0067] S3, the polyvinyl alcohol fiber was mixed with the slurry obtained in Step S2 for 15 seconds, and then 10S was stirred by adding hydrogen peroxide in 5 seconds to prepare a foaming slurry;

[0068] S4, the foaming slurry was prepared by pouring the foaming slurry in step S3, and the mold was released for 24 hours after molding. The mold was put into a standard curing room for 28 days;

(Hole depth: 10 mm, pore size: 8 mm, hole pitch: 15 mm, perforation ratio: 16%, material thickness: 60 mm) was measured, that is, the sample of the alkaline earth slag, the foamed concrete, material.

[0070] Example 6:

[0071] - A kind of alkali slag foaming concrete sound absorbing material, wherein each component is 60.41% by weight of granulated slag, 14.73% of sodium hydroxide, 23.22% of water, 0.6% of hydrogen peroxide and 0.44 %, 0.72% calcium stearate, 0.28% of polypropylene fiber;

[0072] wherein the alkali slag foam concrete has a bulk density of 732 kg / m3.

[0073] A method for preparing an alkali-slag-foamed concrete sound-absorbing material, comprising the steps of:

[0074] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 2min, mixed evenly;

[S275] S2, sodium hydroxide, potassium permanganate and water were mixed in a ratio and stirred to form a solution. The resulting solution was poured into the powder obtained in step Sl and stirred for 45 seconds to prepare a :

[0076] S3, the polypropylene fiber and the slurry obtained in step S2 were mixed and stirred for 15 seconds in accordance with the ratio. After adding the hydrogen peroxide in 5 s, the mixture was stirred for 10 seconds to prepare a foaming slurry.

[0077] S4, the foaming slurry was prepared by pouring the foaming slurry into the test mold, and the mold was released after the molding for 24 hours. The mold release was placed in a standard curing room for 28 days;

(Hole depth 10 mm, pore size 10 mm, hole pitch 15 mm, perforation rate 25%, material thickness 30 mm), that is, the soil of the alkaline earth slag foamed concrete, material.

[0079] Example 7:

[0080] An alkali-slag-foamed concrete sound-absorbing material in which the components are, by weight percentage, granulated blast furnace slag 58.87%, sodium hydroxide 17.94%, water 20.97%, hydrogen peroxide 0.65% %, 0.71% calcium stearate, 0.83% of polypropylene fiber;

[0081] The bulk density of the alkali slag foamed concrete is 740 kg / m3.

[0082] A method for preparing an alkali-slag-foamed concrete sound-absorbing material, comprising the steps of:

[0083] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 2min, mixed evenly;

[S284] S2, sodium hydroxide, potassium permanganate and water were mixed in a ratio, stirred to form a solution, and the resulting solution was poured into the powder obtained in step Sl and sufficiently stirred for 45 seconds to prepare a :

[0085] S3, the polypropylene fiber and the slurry obtained in step S2 were mixed and stirred for 15 seconds, and then the hydrogenated water was stirred for 10 seconds, and then the foaming slurry was made.

[0086] S4, the foaming slurry was prepared by pouring the foaming slurry in step S3, and the mold was released for 24 hours after molding. The mold was put into a standard curing room for 28 days.

(Hole depth: 10 mm, pore size: 8 mm, hole pitch: 15 mm, perforation ratio: 16%, material thickness: 30 mm) was measured, that is, the test piece of the clay material.

[0088] Example 8:

[0089] A kind of alkali slag foaming concrete sound absorbing material, wherein each component is composed of 58.54% of granulated blast furnace slag, 21.41% of sodium hydroxide, 18.11% of water, 0.64% of hydrogen peroxide, %, Calcium stearate 0.7%, polypropylene fiber 0.57%;

[0090] wherein the alkali residue slag concrete has a bulk density of 739 kg / m3.

[0091] The preparation method of the alkali-slag foamed concrete sound-absorbing material comprises the following steps:

[0092] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 2min, mixed evenly;

[S293] S2, mixing sodium hydroxide, potassium permanganate and water in a ratio, mixing to form a solution, and then pouring the resulting solution into the powder obtained in step Sl for 45 seconds to prepare a :

[0094] S3, the polypropylene fiber and the slurry obtained in step S2 were mixed and stirred for 15 seconds, and then the hydrogen peroxide was stirred for 5 seconds to make the foaming slurry.

[0095] S4, the foaming slurry was prepared by pouring the foaming slurry into the test mold, and the mold was released after the molding for 24 hours. The mold release was put into the standard curing room for 28 days;

(Hole depth: 10 mm, pore size: 8 mm, hole pitch: 15 mm, perforation ratio: 16%, material thickness: 30 mm) was measured, and the test piece was subjected to drilling (step depth) material.

[0097] Example 9:

[0098] An alkali-slag-foamed concrete sound-absorbing material in which the components are expressed by weight percent of blast furnace slag 59.82%, sodium hydroxide 14.59%, water 23.57%, hydrogen peroxide 1.26%, high acid potassium 0.04 %, Calcium stearate 0.72%;

Wherein the alkali residue slag concrete has a bulk density of 504 kg / m3.

[0100] A method for preparing an alkali-slag-foamed concrete sound-absorbing material, comprising the steps of:

[0101] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 2min, mixed evenly;

[0102] S2, sodium hydroxide, potassium permanganate and water were mixed in a ratio, and the mixture was stirred to form a solution. The resulting solution was poured into the powder obtained in step Sl and sufficiently stirred for 45 seconds to prepare a :

[S33] S3, and the mixture was stirred for 5 seconds by adding hydrogen peroxide in the slurry obtained in step S2 at a ratio of 5 seconds to prepare a foaming slurry;

[0104] S4, the foaming slurry was prepared by pouring the foaming slurry in step S3, and the mold was released for 24 hours after molding. The mold was put into a standard curing room for 28 days;

(Hole depth: 10 mm, pore size: 8 mm, hole pitch: 15 mm, perforation ratio: 16%, material thickness: 20 mm), that is, the earthmaking slag, the foamed concrete, material.

[0106] Example 10:

[0107] An alkali slag foaming concrete sound absorbing material in which the components are expressed by weight percent of blast furnace slag 59.61%, sodium hydroxide 14.53%, water 23.47%, hydrogen peroxide 1.25%, high acid potassium 0.04 %, Calcium stearate 0.72%, polypropylene fiber 0.38%;

[0108] wherein the alkali slag foam concrete has a bulk density of 521 kg / m3.

[0109] The preparation method of the alkali-slag foamed concrete sound-absorbing material comprises the following steps:

[0110] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 3min, mixed evenly;

[0111] S2, the sodium hydroxide, potassium permanganate and water by mixing ratio, stirring evenly after the formation of the solution, and then the solution into the step Sl the powder was fully stirred for 45s, made : material;

[S312] S3, the polypropylene fiber and the slurry obtained in step S2 were mixed and stirred for 15 seconds, and then the hydrogen peroxide was stirred for 10 seconds, and the foaming slurry was made.

[0113] S4, the foaming slurry was prepared by pouring the foaming slurry into the test mold, and the mold was released after the molding for 24 hours. The mold release was put into the standard curing room for 28 days;

(Hole depth 10 mm, pore size 10 mm, hole pitch 15 mm, perforation rate 25%, material thickness 20 mm), that is, the alkaline earth slag, the foamed concrete, was subjected to punching (step 10) material.

[0115] Example 11:

[0116] - A kind of alkali slag foaming concrete sound absorbing material, in which the components are divided into percentage by weight: granulated blast furnace slag 59.15%, sodium hydroxide 14.42%, water 23.3%, hydrogen peroxide 1.24%, high acid potassium 0.04 %, 0.71% calcium stearate, 1.14% of polypropylene fiber;

[0117] wherein the bulk slag foam concrete has a bulk density of 543 kg / m3.

[0118] A method for preparing an alkali-slag-foamed concrete sound-absorbing material, comprising the steps of:

[0119] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 3min, mixed evenly;

[2120] S2, the sodium hydroxide, potassium permanganate and water by mixing ratio, stirring evenly after the formation of the solution, and then the solution into the step Sl powder in the full mixing 45s, made : material;

[0121] S3, the polypropylene fiber and the slurry obtained in step S2 were mixed and stirred for 15 seconds, and then the hydrogen peroxide was stirred for 5 seconds, and the foaming slurry was made.

[0122] S4, the foaming slurry was prepared by pouring the foaming slurry into the test machine, and the mold was released for 24 hours after the molding was carried out for 24 days.

(Hole depth: 10 mm, pore size: 5 mm, hole pitch: 15 mm, perforation ratio: 6.25%, material thickness: 30 mm) was measured, that is, the soil material.

[0124] Example 12:

[0125] An alkali slag foaming concrete sound absorbing material, wherein each component is divided into by weight percentage of granulated blast furnace slag 57.16%, sodium hydroxide 20.91%, water 18.96%, hydrogen peroxide 1.09% %, Calcium stearate 0.69%, polypropylene fiber 1.16%;

[0126] The bulk density of the alkali slag foamed concrete is 558 kg / m3.

[0127] A method for preparing an alkali-slag-foamed concrete sound-absorbing material, comprising the steps of:

[0128] SI, according to the proportion of granulated blast furnace slag and calcium stearate powder into the mixer for 3min, mixed evenly;

[S2139] S2, mixing sodium hydroxide, potassium permanganate and water in a ratio, mixing to form a solution, and then pouring the resulting solution into the powder obtained in step Sl for 45 seconds to prepare a :

[0130] S3, according to the ratio of polypropylene fiber and the slurry obtained in step S2 mixed for 15s, after 5 seconds by adding hydrogen peroxide to fully stir l0s, made of foam slurry;

[0131] S4, the foaming slurry was prepared by pouring the foaming slurry into the test mold, and the mold was released for 24 hours. The mold release was put into a standard curing room for 28 days.

(Hole depth: 10 mm, pore size: 8 mm, hole pitch: 15 mm, perforation ratio: 16%, material thickness: 60 mm), that is, the earthmaking slag, the foamed concrete, material.

[0133] In the above embodiments:

[0134] The granulated blast furnace slag is from XX company with a specific surface area of ​​452 m3 / kg, a density of 2.91 g / cm3, a basicity coefficient Mo = I, an activity coefficient of Ma = 0.45, and a mass coefficient Mk = , Chemical composition in Table 1.

[0135] Table 1 granulated blast furnace slag chemical composition (by weight percentage)

[0136]

[0137] The performance test of the alkali-slag foamed concrete sound-absorbing material obtained in Examples 1 to 12 was carried out. The results are shown in Table 2:

[0138] Table 2 The main properties of the alkali-slag foamed concrete sound absorbing material obtained in each of the examples

[0140] Conclusion: It can be seen from Table 2 that the alkali-slag foamed concrete sound-absorbing material prepared by the invention has high compressive strength at different dry apparent densities and has good sound absorption effect, especially in the middle and low frequency range High sound absorption performance, and the current urban environment, there are a large number of low-frequency noise source, so the material can be used for the improvement of urban sound environment, especially the improvement of traffic noise.

[0141] It is to be noted that the dry gauge density and compressive strength test of the present invention is based on the determination of the JG / T266-2011 "foam concrete" and the sound absorption coefficient according to "GB / T18696.2-2002 Acoustic impedance tube Measurement of sound absorption and acoustic impedance Part II: Transfer function method ", the test frequency range of 50Hz-1600Hz, take the frequency range of the sound absorption coefficient of the mean.

[0142] It is to be understood that the above preferred embodiments are merely illustrative of the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail by way of the above-described preferred embodiments, those skilled in the art will appreciate that the Various changes in form and detail are made without departing from the scope of the invention as defined by the appended claims.