CN103193448B - Straw fiber reinforcement air-entrained concrete and preparation method thereof - Google Patents

Straw fiber reinforcement air-entrained concrete and preparation method thereof Download PDF

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CN103193448B
CN103193448B CN201310088714.8A CN201310088714A CN103193448B CN 103193448 B CN103193448 B CN 103193448B CN 201310088714 A CN201310088714 A CN 201310088714A CN 103193448 B CN103193448 B CN 103193448B
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water
rice
base
straw fibre
straw
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CN103193448A (en
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李方贤
韦江雄
余其俊
胡捷
徐志辉
陈阳
高品海
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South China University of Technology SCUT
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Abstract

The invention discloses straw fiber reinforcement air-entrained concrete which comprises a base material, an aluminum powder paste, a straw fiber, an additive and water, wherein the doping amount of the aluminum powder paste accounts for 0.06%-0.09% of the dry weight of the base material; the doping amount of the additive accounts for 0.5%-0.8% of the dry weight of the base material; the doping amount of the straw fiber accounts for 2%-10% of the dry weight of the base material; and the mass ratio of the water and the base material is 0.52-0.60, The invention also discloses a preparation method of the straw fiber reinforcement air-entrained concrete. The straw fiber reinforcement air-entrained concrete disclosed by the invention reduces the shrinkage cracking and production cost of air-entrained concrete and solves the problems of straw resource waste, ceramic waste treatment and environmental pollution to a certain degree.

Description

A kind of rice-straw fibre strengthens gas concrete and preparation method thereof
Technical field
The present invention relates to Novel light wall body material of construction, particularly a kind of rice-straw fibre strengthens gas concrete and preparation method thereof.
Background technology
Air-entrained concrete building block is the New Building Materials of a kind of less energy-consumption, environment-friendly type, has lightweight, the advantage such as thermal and insulating performance good, intensity is high, anti-seismic performance is good, good processability, high temperature resistant, sound-proofing properties is good.Gas concrete mainly contains serial two kinds of fly ashlime series and sand-lime.The calcareous material of existing aerated concrete products is cement, lime and blast-furnace slag etc., and siliceous material has flyash, sand, tuff, mine tailing etc., and except flyash, other siliceous material all requires SiO 2content is greater than 75%, and requires quartzy state SiO 2content more high better, strengthen toughening material be mainly synthon, as polypropylene fibre, mix fiber and can effectively reduce aerated concrete masonry shrinkage cracking.And flyash is as active mineral Additive, in building material, obtain using widely, flyash is fewer and feweri in the future as the starting material of producing gas concrete; River Sha China is valuable natural resource, utilizes it to produce gas concrete also impossible in China's large-scale popularization application; Synthon are expensive, limited its widespread use in gas concrete.Thereby it is very important and urgent to find starting material production gas concrete novel wall material that is new, cheap, abundant amount.
Shi Ge large agricultural country of China, have abundant rice straw resource, these remaining rice straws are used as feed, fertilizer, paper etc. except minority, and other major part is all field on-site incineration, this has not only wasted a large amount of resources, also physical environment has been caused to serious pollution.In recent years, along with the minimizing gradually of ploughing, water resources and the energy day by day in short supply, and the frequent appearance of straw and wheat straw phenomenon is burned in rural area, various places in a large number, the comprehensive utilization of strengthening the stalks such as straw not only becomes an important process content of various places governments at all levels, also becomes the popular domain of the industrial community market developments such as scientific and technological circle's technological development in recent years and agricultural, the energy, building materials, chemical industry.But at present the comprehensive utilization of straw is also totally rested in the use-pattern of single use and simple coarse, as the straw as cement based strongthener in recent years, the natural plant fibres such as wheat straw, using more is only through roughing or a unprocessed raw material, straw, the vegetable fibres such as wheat straw carry out refinforced cement goods, the development that can effectively suppress cement products (especially thin plate cement products) shrinkage crack the same as organic polymer fiber, but there is outstanding long durability problem in rough machined vegetable fibre, the intensity of its matrix material and toughness all extend in time and have decline by a relatively large margin, thereby industrial production and the widespread use of vegetable fibre mass-producing are affected.Therefore, explore the deep process technology of the vegetable fibres such as straw, wheat straw, improve its utility value at building materials field, significant.
Since reform and opening-up, China's ceramic industry has obtained fast development, as floor tile, snitaryware, industrial ceramics and domestic ceramics equal yield line all account for the more than 60% of Gross World Product, but also with annual more than 30% speed increment.Although ceramic industry is to advance China's economic construction to make certain contribution, but, along with the negative impact that the development of ceramic industry brings to physical environment is also more and more outstanding, overexploitation and irrational utilization etc. of resource are directly affected to the Sustainable development of industry self.Particularly, in recent years along with the increase of ceramic yield, the ceramic waste material of the formation particularly waste material of polished tile gets more and more.At present, these waste residues mainly adopt landfill disposal.This processing mode labor intensive material resources, polluted underground water matter, also takies a large amount of land resources.How turning waste into wealth, change waste material is resource, has become the focus of research.
Summary of the invention
In order to overcome the above-mentioned shortcoming and deficiency of prior art, the object of the present invention is to provide a kind of rice-straw fibre to strengthen gas concrete and preparation method thereof, the present invention has reduced gas concrete shrinkage cracking and production cost, has solved to a certain extent the problems such as straw resource waste and environmental pollution.
Object of the present invention is achieved through the following technical solutions:
A kind of rice-straw fibre strengthens gas concrete, comprises base-material, aluminium powder cream, rice-straw fibre, admixture and water, and the incorporation of described aluminium powder cream is 0.06%~0.09% of base-material dry mass; The incorporation of described admixture is 0.5%~0.8% of base-material dry mass; The incorporation of described rice-straw fibre is 2%~10% of base-material dry mass; The mass ratio of described water and base-material is 0.52~0.60.
Described base-material comprises cement, lime, ceramic waste material, flyash and gypsum; The mass ratio of described cement, lime, ceramic waste material, flyash and gypsum is 15~20: 15~20: 0~40:0~65:2~5.
Described admixture is water reducer and trolamine or alkali salt is composite forms; Described water reducer is polycarboxylate water-reducer or naphthalene water reducer.Add appropriate admixture, be controlled at 140~180mm with the divergence that ensures slurry.
Described ceramic waste material, the mass percent of its chemical composition is: SiO 268%~78%; Al 2o 315%~20%; Fe 2o 30.5%~1.5%; MgO0.5%~1.0%; CaO0.5~1.0%; Na 2o1.0%~2.0%; K 2o1.0%~2.0%; The loss on ignition of described ceramic waste material is 3.0%~6.0%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 10%.
The mass percent of the chemical composition of described flyash is: SiO 245%~55%; Al 2o 330.0%~40.0%; Fe 2o 32.0%~5.0%; MgO0.5%~1.0%; CaO3.0%~6.0%; Na 2o0.1%~0.5%; K 2o0.5%~1.0%; The loss on ignition of described flyash is 3.0%~5.0%; Described fineness of pulverized-coal ash requirement 0.08mm square hole sieve tails over and is less than 15%.
In described lime, CaO content is greater than 80%, and its fineness requirement 0.08mm square hole sieve tails over and is less than 15%.
Described gypsum is desulfurated plaster, and its crystal water is greater than 7%, SO 3content is for being greater than 45%.
Above-mentioned rice-straw fibre strengthens the preparation method of gas concrete, comprises the following steps:
(1) taking base-material and mix, is 0.52~0.60 to take water consumption by the mass percent of water and base-material, and water temperature is controlled to 50~60 DEG C, moisture is become to two parts: a water mixes with admixture, and admixture mixes by 0.5%~0.8% of base-material dry mass; A water mixes with rice-straw fibre, and rice-straw fibre is disperseed in water, and rice-straw fibre mixes by 2%~10% of base-material dry mass;
(2) water mixing with admixture is joined in base-material, stir 30~60s, then add the water that is dispersed with rice-straw fibre, stir again 30~60s, the aluminium powder finally adding by 0.06%~0.09% of base-material dry mass, stirs 30~60s, the slip that obtains mixing; Insulation is set in whipping process, and the molding temperature while ensureing slip casting is at 45~50 DEG C;
(3) the slip Quick pouring stirring step (2) being obtained enters to be warming up in advance in the mould of 50 DEG C~60 DEG C gets angry 20~30 minutes, precuring 2~4 hours at 50~60 DEG C of temperature after having got angry, after blank strength reaches 0.7~1.0MPa, specification is as required cut;
(4) the complete base substrate of cutting is delivered to and in autoclave, carried out steam-curedly, the method for maintenance is: heats up and reach 0.8~1.2MPa to normal atmosphere in 2~3 hours, and constant temperature and pressure 5~7 hours, then decrease temperature and pressure arrives normal temperature in 2~3 hours, gets product.
Described rice-straw fibre is made up of following methods;
Straw raw material is carried out to separating of leaf, bar and fringe, leaf, bar and fringe are cut to 2~5cm, with 50 DEG C~90 DEG C hot-water soaks 10~24 hours, after processing with alkaline solution, calcium salt soln and mould inhibitor, carry out defibrination, refining concentration is about 10%~15%, after slurry is filtered dry, obtains rice-straw fibre.
Step takes base-material and mixes described in (1), is specially:
Be cement in mass ratio: lime: ceramic waste material: flyash: gypsum=15~20: 15~20: cement, lime, ceramic waste material, flyash and gypsum are got in 0~40:0~65:2~5, and batch mixing is to even.
Compared with prior art, the present invention has the following advantages and beneficial effect:
1, the present invention adopts the rice-straw fibre the processed strongthener as gas concrete, and the gas concrete drying shrinkage value of preparation is little, and resistance to cleavage is good, and performance meets GB requirement.
2, the present invention adopts and utilizes industry and agricultural waste as raw material, has reduced the pollution of waste material to surrounding enviroment, and realization is turned waste into wealth, and makes resource obtain maximum using.
3, the building block unit weight that prepared by the present invention is at 700kg/m 3left and right, intensity is high, and drying shrinkage is little, and technique is simple.
4, the gas concrete thermal and insulating performance that prepared by the present invention is good, can serve as the lagging material of bearing wall, and energy-saving effect is obvious.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1
(1) take base-material: be cement in mass ratio: lime: ceramic waste material: flyash: gypsum=18: 15: 34:30:3 takes cement, lime, ceramic waste material, flyash and gypsum and carries out batch mixing to even; Take water consumption by ratio of water to material 0.58, water temperature is controlled to 50 DEG C, moisture is become to two parts: a water mixes with admixture, admixture mixes by 0.5% of base-material dry mass; A water mixes with rice-straw fibre, and rice-straw fibre is disperseed in water, and rice-straw fibre mixes by 3% of base-material dry mass;
Described admixture is polycarboxylate water-reducer and trolamine is composite forms;
Described ceramic waste material, the mass percent of its chemical composition is: SiO 270.3%; Al 2o 316.5%; Fe 2o 31.1%; MgO1.1%; CaO0.6%; Na 2o3.0%; K 2o2.1%; The loss on ignition of described ceramic waste material is 5.3%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 10%;
The mass percent of described its chemical composition of flyash is: SiO 247.5%; Al 2o 336.8%; Fe 2o 34.5%; MgO0.6%; CaO5.4%; Na 2o0.4%; K 2o0.7%; The loss on ignition of described ceramic waste material is 4.1%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 15%.
Described gypsum is desulfurated plaster, and its crystal water is greater than 7%, SO 3content is for being greater than 45%;
(2) water mixing with admixture is joined in the base-material mixing, stir 60s, again the water that is dispersed with rice-straw fibre is joined in the uniform slip of mix, stir again 60s, finally add 0.06% aluminium powder of base-material dry mass to stir 30s, the slip that obtains mixing, molding temperature when slip casting is 45 DEG C;
(3) slip Quick pouring being entered to temperature is to get angry 25 minutes in the mould of 50 DEG C, and after having got angry, precuring 3 hours at 50 DEG C of temperature is cut after blank strength reaches 0.7~1.0MPa;
(4) the complete base substrate of cutting is delivered to and in autoclave, carried out steam-curedly, the method for maintenance is: heats up and reach 1MPa to normal atmosphere in 3 hours, and constant temperature and pressure 6 hours, then decrease temperature and pressure arrives normal temperature in 2 hours, obtains finished product, its performance index are as shown in table 1.
The performance index of gas concrete prepared by table 1
Performance Over dry volume density (kg/m 3) Over dry ultimate compression strength (MPa) Dry shrinkage (mm/m) Water-intake rate
Index 723 6.6 0.38 37.5%
Embodiment 2
(1) take base-material: be cement in mass ratio: lime: ceramic waste material: flyash: gypsum=15: 20: 35:28:2 takes cement, lime, ceramic waste material, flyash and gypsum and carries out batch mixing to even; Take water consumption by ratio of water to material 0.55, water temperature is controlled to 50 DEG C, moisture is become to two parts: a water mixes with admixture, admixture mixes by 0.6% of base-material dry mass; A water mixes with rice-straw fibre, and rice-straw fibre is disperseed in water, and rice-straw fibre mixes by 5% of base-material dry mass;
Described admixture or by naphthalene water reducer and trolamine is composite forms;
Described ceramic waste material, the mass percent of its chemical composition is: SiO 270.3%; Al 2o 316.5%; Fe 2o 31.1%; MgO1.1%; CaO0.6%; Na 2o3.0%; K 2o2.1%; The loss on ignition of described ceramic waste material is 5.3%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 10%;
The mass percent of described its chemical composition of flyash is: SiO 247.5%; Al 2o 336.8%; Fe 2o 34.5%; MgO0.6%; CaO5.4%; Na 2o0.4%; K 2o0.7%; The loss on ignition of described ceramic waste material is 4.1%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 15%.
Described gypsum is desulfurated plaster, and its crystal water is greater than 7%, SO 3content is for being greater than 45%;
(2) water mixing with admixture is joined in the base-material mixing, stir 60s, again the water that is dispersed with rice-straw fibre is joined in the uniform slip of mix, stir again 60s, finally add 0.07% aluminium powder of base-material dry mass to stir 30s, the slip that obtains mixing, molding temperature when slip casting is 50 DEG C;
(3) slip Quick pouring being entered to temperature is to get angry 25 minutes in the mould of 50 DEG C, and after having got angry, precuring 3 hours at 50 DEG C of temperature is cut after blank strength reaches 0.7~1.0MPa;
(4) the complete base substrate of cutting is delivered to and in autoclave, carried out steam-curedly, the method for maintenance is: heats up and reach 1MPa to normal atmosphere in 3 hours, and constant temperature and pressure 6 hours, then decrease temperature and pressure arrives normal temperature in 2 hours, obtains finished product, its performance index are as shown in table 2.
The performance index of gas concrete prepared by table 2
Performance Over dry volume density (kg/m 3) Over dry ultimate compression strength (MPa) Dry shrinkage (mm/m) Water-intake rate
Index 715 6.1 0.37 35.2%
Embodiment 3
(1) take base-material: be cement in mass ratio: lime: ceramic waste material: flyash: gypsum=15: 17: 39:27:2 takes cement, lime, ceramic waste material, flyash and gypsum and carries out batch mixing to even; Take water consumption by ratio of water to material 0.53, water temperature is controlled to 55 DEG C, moisture is become to two parts: a water mixes with admixture, admixture mixes by 0.7% of base-material dry mass; A water mixes with rice-straw fibre, and rice-straw fibre is disperseed in water, and rice-straw fibre mixes by 5% of base-material dry mass;
Described admixture is polycarboxylate water-reducer and alkali salt is composite forms;
Described ceramic waste material, the mass percent of its chemical composition is: SiO 270.3%; Al 2o 316.5%; Fe 2o 31.1%; MgO1.1%; CaO0.6%; Na 2o3.0%; K 2o2.1%; The loss on ignition of described ceramic waste material is 5.3%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 10%;
The mass percent of described its chemical composition of flyash is: SiO 247.5%; Al 2o 336.8%; Fe 2o 34.5%; MgO0.6%; CaO5.4%; Na 2o0.4%; K 2o0.7%; The loss on ignition of described ceramic waste material is 4.1%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 15%.
Described gypsum is desulfurated plaster, and its crystal water is greater than 7%, SO 3content is for being greater than 45%;
In described lime, CaO content is greater than 80%, and its fineness requirement 0.08mm square hole sieve tails over and is less than 15%.
Described cement is the silicate cement of 42.5 grades.
(2) water mixing with admixture is joined in the base-material mixing, stir 60s, again the water that is dispersed with rice-straw fibre is joined in the uniform slip of mix, stir again 60s, finally add 0.075% aluminium powder of base-material dry mass to stir 30s, the slip that obtains mixing, molding temperature when slip casting is 50 DEG C.
(3) slip Quick pouring being entered to temperature is to get angry 30 minutes in the mould of 50 DEG C, and after having got angry, precuring 3 hours at 50 DEG C of temperature is cut after blank strength reaches 0.7~1.0MPa; Described admixture is formed in alkali salt is composite by naphthalene water reducer.
(4) the complete base substrate of cutting is delivered to and in autoclave, carried out steam-curedly, the method for maintenance is: heats up and reach 1MPa to normal atmosphere in 3 hours, and constant temperature and pressure 6 hours, then decrease temperature and pressure arrives normal temperature in 2 hours, obtains finished product, its performance index are as shown in table 3.
The performance index of gas concrete prepared by table 3
Performance Over dry volume density (kg/m 3) Over dry ultimate compression strength (MPa) Dry shrinkage (mm/m) Water-intake rate
Index 708 6.2 0.36 38.7%
Embodiment 4
(1) take base-material: be cement in mass ratio: lime: ceramic waste material: flyash: gypsum=20: 15: 35:28:2 takes cement, lime, ceramic waste material, flyash and gypsum and carries out batch mixing to even; Take water consumption by ratio of water to material 0.52, water temperature is controlled to 55 DEG C, moisture is become to two parts: a water mixes with admixture, admixture mixes by 0.8% of base-material dry mass; A water mixes with rice-straw fibre, and rice-straw fibre is disperseed in water, and rice-straw fibre mixes by 5% of base-material dry mass;
Described admixture is naphthalene water reducer and alkali salt is composite forms;
Described ceramic waste material, the mass percent of its chemical composition is: SiO 271.5%; Al 2o 315%; Fe 2o 31.5%; MgO1.0%; CaO1.0%; Na 2o2.0%; K 2o2.0%; The loss on ignition of described ceramic waste material is 6%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 10%;
The mass percent of described its chemical composition of flyash is: SiO 245%; Al 2o 340%; Fe 2o 32.5%; MgO1.0%; CaO5.0%; Na 2o0.5%; K 2o1.0%; The loss on ignition of described ceramic waste material is 5.0%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 15%.
Described rice-straw fibre is made up of following methods; Straw raw material is carried out to leaf, bar and fringe and separate, leaf, bar and fringe are cut to 4cm, with 70 DEG C of hot-water soaks 18 hours, after processing, carry out defibrination with alkaline solution, calcium salt soln and mould inhibitor, refining concentration is about 12%, after slurry is filtered dry, obtains rice-straw fibre;
(2) water mixing with admixture is joined in the base-material mixing, stir 60s, again the water that is dispersed with rice-straw fibre is joined in the uniform slip of mix, stir again 60s, finally add 0.08% aluminium powder of base-material dry mass to stir 30s, the slip that obtains mixing, molding temperature when slip casting is 50 DEG C; Described admixture is formed in alkali salt is composite by naphthalene water reducer;
(3) slip Quick pouring being entered to temperature is to get angry 30 minutes in the mould of 50 DEG C, and after having got angry, precuring 3 hours at 50 DEG C of temperature is cut after blank strength reaches 0.7~1.0MPa;
(4) the complete base substrate of cutting is delivered to and in autoclave, carried out steam-curedly, the method for maintenance is: heats up and reach 1MPa to normal atmosphere in 3 hours, and constant temperature and pressure 6 hours, then decrease temperature and pressure arrives normal temperature in 2 hours, obtains finished product, its performance index are as shown in table 4.
The performance index of gas concrete prepared by table 4
Performance Over dry volume density (kg/m 3) Over dry ultimate compression strength (MPa) Dry shrinkage (mm/m) Water-intake rate
Index 695 5.4 0.34 36.4%
Embodiment 5
(1) take base-material: be cement in mass ratio: lime: flyash: gypsum=20: 15: 65:2 takes cement, lime, flyash and gypsum and carries out batch mixing to even; Take water consumption by ratio of water to material 0.8, water temperature is controlled to 55 DEG C, moisture is become to two parts: a water mixes with admixture, admixture mixes by 0.8% of base-material dry mass; A water mixes with rice-straw fibre, and rice-straw fibre is disperseed in water, and rice-straw fibre mixes by 10% of base-material dry mass;
Described admixture is naphthalene water reducer and alkali salt is composite forms;
Described ceramic waste material, the mass percent of its chemical composition is: SiO 278%; Al 2o 315%; Fe 2o 30.5%; MgO0.5%; CaO0.5%; Na 2o1.0%; K 2o1.0%; The loss on ignition of described ceramic waste material is 3.5%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 10%;
The mass percent of described its chemical composition of flyash is: SiO 255%; Al 2o 335.9%; Fe 2o 32.0%; MgO0.5%; CaO3.0%; Na 2o0.1%; K 2o0.5%; The loss on ignition of described ceramic waste material is 3%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 15%.
Described rice-straw fibre is made up of following methods; Straw raw material is carried out to leaf, bar and fringe and separate, leaf, bar and fringe are cut to 2cm, with 50 DEG C of hot-water soaks 10 hours, after processing, carry out defibrination with alkaline solution, calcium salt soln and mould inhibitor, refining concentration is about 10%, after slurry is filtered dry, obtains rice-straw fibre;
(2) water mixing with admixture is joined in the base-material mixing, stir 30s, again the water that is dispersed with rice-straw fibre is joined in the uniform slip of mix, stir again 30s, finally add 0.08% aluminium powder of base-material dry mass to stir 30s, the slip that obtains mixing, molding temperature when slip casting is 50 DEG C; Described admixture is formed in alkali salt is composite by naphthalene water reducer;
(3) the slip Quick pouring stirring step (2) being obtained enters in the mould that is warming up in advance 50 DEG C to get angry 20 minutes, precuring 2 hours at 50 DEG C of temperature after having got angry, after blank strength reaches 0.7~1.0MPa, specification is as required cut;
(4) the complete base substrate of cutting is delivered to and in autoclave, carried out steam-curedly, the method for maintenance is: heats up and reach 0.8MPa to normal atmosphere in 2 hours, and constant temperature and pressure 5 hours, then decrease temperature and pressure arrives normal temperature in 2 hours, gets product, its performance index are as shown in table 5.
The performance index of gas concrete prepared by table 5
Performance Over dry volume density (kg/m 3) Over dry ultimate compression strength (MPa) Dry shrinkage (mm/m) Water-intake rate
Index 711 5.8 0.33 36.8%
Embodiment 6
(1) take base-material: be cement in mass ratio: lime: ceramic waste material: gypsum=20: 15: 35:5 takes cement, lime, ceramic waste material and gypsum and carries out batch mixing to even; Take water consumption by ratio of water to material 0.7, water temperature is controlled to 50 DEG C, moisture is become to two parts: a water mixes with admixture, admixture mixes by 0.8% of base-material dry mass; A water mixes with rice-straw fibre, and rice-straw fibre is disperseed in water, and rice-straw fibre mixes by 5% of base-material dry mass;
Described admixture is naphthalene water reducer and alkali salt is composite forms;
Described ceramic waste material, the mass percent of its chemical composition is: SiO 268%; Al 2o 320%; Fe 2o 30.5%; MgO0.5%; CaO1.0%; Na 2o2.0%; K 2o2.0%; The loss on ignition of described ceramic waste material is 6%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 10%;
The mass percent of described its chemical composition of flyash is: SiO 251.5%; Al 2o 330%; Fe 2o 35%; MgO1%; CaO6%; Na 2o0.5%; K 2o1%; The loss on ignition of described ceramic waste material is 5%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 15%.
Described rice-straw fibre is made up of following methods; Straw raw material is carried out to leaf, bar and fringe and separate, leaf, bar and fringe are cut to 5cm, with 90 DEG C of hot-water soaks 24 hours, after processing, carry out defibrination with alkaline solution, calcium salt soln and mould inhibitor, refining concentration is about 15%, after slurry is filtered dry, obtains rice-straw fibre;
(2) water mixing with admixture is joined in the base-material mixing, stir 30s, again the water that is dispersed with rice-straw fibre is joined in the uniform slip of mix, stir again 60s, finally add 0.08% aluminium powder of base-material dry mass to stir 30s, the slip that obtains mixing, molding temperature when slip casting is 40 DEG C;
(3) the slip Quick pouring stirring step (2) being obtained enters in the mould that is warming up in advance 60 DEG C to get angry 30 minutes, precuring 4 hours at 60 DEG C of temperature after having got angry, after blank strength reaches 0.7~1.0MPa, specification is as required cut;
(4) the complete base substrate of cutting is delivered to and in autoclave, carried out steam-curedly, the method for maintenance is: heats up and reach 1.2MPa to normal atmosphere in 3 hours, and constant temperature and pressure 7 hours, then decrease temperature and pressure arrives normal temperature in 3 hours, gets product, its performance index are as shown in table 6.
The performance index of gas concrete prepared by table 6
Performance Over dry volume density (kg/m 3) Over dry ultimate compression strength (MPa) Dry shrinkage (mm/m) Water-intake rate
Index 721 6.1 0.34 34.2%
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under spirit of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.

Claims (6)

1. rice-straw fibre strengthens the preparation method of gas concrete, it is characterized in that, comprises the following steps:
(1) take base-material and mix, be 0.52~0.60 to take water consumption by the mass percent of water and base-material, water temperature is controlled to 50~60 DEG C, moisture is become to two parts: a water mixes with admixture, admixture mixes by 0.5%~0.8% of base-material dry mass; A water mixes with rice-straw fibre, and rice-straw fibre is disperseed in water, and rice-straw fibre mixes by 2%~10% of base-material dry mass;
Described rice-straw fibre is made up of following methods; Straw raw material is carried out to separating of leaf, bar and fringe, leaf, bar and fringe are cut to 2~5cm, with 50 DEG C~90 DEG C hot-water soaks 10~24 hours, after processing with alkaline solution, calcium salt soln and mould inhibitor, carry out defibrination, refining concentration is about 10%~15%, after slurry is filtered dry, obtains rice-straw fibre;
Described admixture is water reducer and trolamine or alkali salt is composite forms; Described water reducer is polycarboxylate water-reducer or naphthalene water reducer;
(2) water mixing with admixture is joined in base-material, stir 30~60s, then add the water that is dispersed with rice-straw fibre, stir again 30~60s, the aluminium powder finally adding by 0.06%~0.09% of base-material dry mass, stirs 30~60s, the slip that obtains mixing; Insulation is set in whipping process, and the molding temperature while ensureing slip casting is at 45~50 DEG C;
(3) the slip Quick pouring stirring step (2) being obtained enters to be warming up in advance in the mould of 50 DEG C~60 DEG C gets angry 20~30 minutes, precuring 2~4 hours at 50~60 DEG C of temperature after having got angry, after blank strength reaches 0.7~1.0MPa, specification is as required cut;
(4) the complete base substrate of cutting is delivered to and in autoclave, carried out steam-curedly, the method for maintenance is: heats up and reach 0.8~1.2MPa to normal atmosphere in 2~3 hours, and constant temperature and pressure 5~7 hours, then decrease temperature and pressure arrives normal temperature in 2~3 hours, gets product.
2. rice-straw fibre according to claim 1 strengthens the preparation method of gas concrete, it is characterized in that, step takes base-material and mixes described in (1), is specially:
Be cement in mass ratio: lime: ceramic waste material: flyash: gypsum=15~20: 15~20: cement, lime, ceramic waste material, flyash and gypsum are got in 0~40:0~65:2~5, and batch mixing is to even.
3. rice-straw fibre according to claim 2 strengthens the preparation method of gas concrete, it is characterized in that, and described ceramic waste material, the mass percent of its chemical composition is: SiO 268%~78%; Al 2o 315%~20%; Fe 2o 30.5%~1.5%; MgO 0.5%~1.0%; CaO 0.5~1.0%; Na 2o 1.0%~2.0%; K 2o 1.0%~2.0%; The loss on ignition of described ceramic waste material is 3.0%~6.0%; Described ceramic waste material fineness requirement 0.08mm square hole sieve tails over and is less than 10%.
4. rice-straw fibre according to claim 2 strengthens the preparation method of gas concrete, it is characterized in that, the mass percent of the chemical composition of described flyash is: SiO 245%~55%; Al 2o 330.0%~40.0%; Fe 2o 32.0%~5.0%; MgO 0.5%~1.0%; CaO 3.0%~6.0%; Na 2o 0.1%~0.5%; K 2o 0.5%~1.0%; The loss on ignition of described flyash is 3.0%~5.0%; Described fineness of pulverized-coal ash requirement 0.08mm square hole sieve tails over and is less than 15%.
5. rice-straw fibre according to claim 2 strengthens the preparation method of gas concrete, it is characterized in that, in described lime, CaO content is greater than 80%, and its fineness requirement 0.08mm square hole sieve tails over and is less than 15%.
6. rice-straw fibre according to claim 2 strengthens the preparation method of gas concrete, it is characterized in that, described gypsum is desulfurated plaster, and its crystal water is greater than 7%, SO 3content is for being greater than 45%.
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