CN112456952A - Raw soil building material based on waste pit mud and preparation method and application thereof - Google Patents
Raw soil building material based on waste pit mud and preparation method and application thereof Download PDFInfo
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- CN112456952A CN112456952A CN202011360000.4A CN202011360000A CN112456952A CN 112456952 A CN112456952 A CN 112456952A CN 202011360000 A CN202011360000 A CN 202011360000A CN 112456952 A CN112456952 A CN 112456952A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical Kinetics & Catalysis (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the field of environment-friendly building materials, and particularly discloses a raw soil building material based on waste pit mud, a preparation method and application thereof, wherein the raw soil building material based on the waste pit mud takes the waste pit mud, an additive and the like as raw materials, and the additive consisting of slag powder, cement, calcium lignosulphonate, sodium carbonate, potassium silicate powder, calcium sulphate dihydrate, polyvinyl alcohol rubber powder and sodium sulphate is added after the waste pit mud is pretreated, so that the raw soil building material can be prepared for building a raw soil building, and the problems that the waste pit mud cannot be reasonably recycled in a large scale and the environmental pollution is easily caused due to improper treatment in the prior art are solved; the provided preparation method is simple, the prepared raw soil building material based on the waste pit mud is high in strength, good in durability and mechanical property, and capable of effectively saving clay resources, meanwhile, the water resistance and freezing resistance can be greatly improved through the additive, the strength and the structure are greatly increased, and the market prospect is wide.
Description
Technical Field
The invention relates to the field of environment-friendly building materials, in particular to a raw soil building material based on waste pit mud and a preparation method and application thereof.
Background
The pit mud is used as clay for sealing the pit and manufacturing the pit bottom, and has important significance for brewing white spirit. The quality of the cellar mud directly determines the quality of the wine. The waste pit mud is industrial waste of wine brewing enterprises, which is discarded after the pit mud used in sealed fermentation of the wine brewing enterprises is used for multiple times. As the cellar mud is enriched with anaerobic functional bacteria, clostridium allergosomians and the like related to aroma generation, the anaerobic bacteria are more and more accumulated in the cellar mud along with the increase of fermentation production time. Therefore, the old pit mud needs to be replaced regularly in the white spirit production to promote the improvement of the high-quality product rate of the fermented wine, and the replaced pit mud is the waste pit mud and needs to be safely disposed.
At present, the abandoned pit mud is not uniformly treated, and basically all the abandoned pit mud is stacked in the open air. Because the main components of the waste pit mud are the mixture of red clay, chaff, fermented grains and the like, the waste pit mud has the moisture content of 20-35 wt% and is easy to mildew and smell, and the environment pollution is easily caused by improper treatment. The method is characterized in that 8-10 ten thousand tons of waste pit mud are produced in a certain city of Guizhou province in an example year, most of the waste pit mud are stacked in the open air at present, odor and mosquitoes are easily produced, certain influence is caused on the ecological environment, and the waste pit mud is discharged into a water body along with surface runoff in rainy days, so that the water body environment is threatened. Domestic documents on resource treatment of the waste pit mud are few and do not see related patents, basically, the existing method for treating the waste pit mud only adopts a process for producing organic fertilizer through fermentation, the use amount of the organic fertilizer is small, the market is very low, and the treatment amount of the organic fertilizer can not meet the production amount of the waste pit mud.
Therefore, the above technical solutions have the following disadvantages in practical use: in the prior art, the waste pit mud cannot be reasonably utilized in a large-scale resource manner, and the problem of environmental pollution caused by improper treatment exists. Therefore, the application field is enlarged, the treatment is reasonably and cautiously carried out, and the harmless and resource utilization becomes the urgent priority for solving the problem.
Disclosure of Invention
The embodiment of the invention aims to provide a raw soil building material based on waste pit mud, and aims to solve the problems that the waste pit mud in the prior art provided by the background art cannot be reasonably utilized in a large-scale resource manner, and is inappropriate to treat, so that the environmental pollution is easily caused.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the raw soil building material based on the waste pit mud comprises the following raw materials: additive and pit mud material; the pit mud soil material is a material with the water content of below 5wt% obtained by pretreating waste pit mud; the raw materials of the additive comprise slag powder, cement, calcium lignosulphonate, sodium carbonate, potassium silicate powder, calcium sulphate dihydrate, polyvinyl alcohol rubber powder and sodium sulphate.
As a further scheme of the invention: the pretreatment is to sterilize, deodorize, dry and crush the waste pit mud to obtain a material with the water content controlled below 5wt% and the particle size smaller than 5 mm.
As a still further scheme of the invention: the additive comprises the following raw materials in parts by weight: 40-50 parts of slag powder, 10-15 parts of cement, 10-15 parts of calcium lignosulphonate, 10-15 parts of sodium carbonate, 10-15 parts of potassium silicate powder, 10-15 parts of calcium sulfate dihydrate, 5-10 parts of polyvinyl alcohol rubber powder and 5-8 parts of sodium sulfate.
Another object of the embodiments of the present invention is to provide a method for preparing raw soil building material based on waste pit mud, which comprises the following steps:
and weighing an additive and pit mud materials according to the proportion, and uniformly mixing to obtain the raw soil building material based on the waste pit mud.
The embodiment of the invention also aims to provide the raw soil building material based on the waste pit mud, which is prepared by the preparation method of the raw soil building material based on the waste pit mud.
The embodiment of the invention also aims to provide application of the raw soil building material based on the waste pit mud in building construction.
Compared with the prior art, the invention has the beneficial effects that:
the raw soil building material based on the waste pit mud provided by the invention takes the waste pit mud, an additive and the like as raw materials, the waste pit mud is pretreated, and then the additive consisting of slag powder, cement, calcium lignosulphonate, sodium carbonate, potassium silicate powder, calcium sulfate dihydrate, polyvinyl alcohol rubber powder and sodium sulfate is added, so that the raw soil building material based on the waste pit mud can be prepared, and further can be used for building raw soil (rammed soil) buildings, and the problems that the waste pit mud cannot be reasonably utilized in a large-scale manner and is improper in treatment, and environmental pollution is easily caused in the prior art are solved; the prepared raw soil building material based on the waste pit mud has the advantages of high strength, good durability and mechanical property, effective saving of clay resources, protection of natural resources, good application prospect, greatly improved water and freezing resistance through the admixture, greatly increased strength and structure, and wide market prospect.
Drawings
Fig. 1 is a process circuit diagram of a preparation method of a raw soil building material based on waste pit mud according to an embodiment of the present invention.
Fig. 2 is a process circuit diagram of a method for preparing raw soil building material based on waste pit mud according to another embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The raw soil building material based on the waste pit mud provided by the embodiment of the invention comprises the following raw materials: additive and pit mud material; the pit mud soil material is a material obtained by pretreating waste pit mud and controlling the water content to be below 5 wt%; the raw materials of the additive comprise slag powder, cement, calcium lignosulphonate, sodium carbonate, potassium silicate powder, calcium sulphate dihydrate, polyvinyl alcohol rubber powder and sodium sulphate.
According to the embodiment of the invention, the pit mud soil material is obtained by pretreating the waste pit mud as a main raw material, and the additive consisting of slag powder, cement, calcium lignosulphonate, sodium carbonate, potassium silicate powder, calcium sulphate dihydrate, polyvinyl alcohol rubber powder and sodium sulphate is added, so that the raw soil building material based on the waste pit mud can be prepared, and further can be used for building raw soil (rammed soil) buildings, the problem of large-scale resource utilization of the waste pit mud is solved, and the pit mud soil material obtained after treatment has a unique environment-friendly concept as the raw soil building material rammed ecological niche.
As another preferred embodiment of the invention, the pretreatment is to sterilize, deodorize, dry and crush the waste pit mud to obtain a material with the water content controlled below 5wt% and the particle size smaller than 5 mm.
As another preferred embodiment of the invention, the sterilization is microbial sterilization treatment, namely, lime powder which accounts for 5-10wt% of the dry weight of the waste pit mud is added into the waste pit mud, the waste pit mud is uniformly mixed, and the mixture is stacked for reaction.
As another preferred embodiment of the invention, the microorganism sterilization treatment specifically comprises the steps of placing the waste pit mud with certain water content in a stacking area, adding lime powder, stirring by using a digging machine (or a turning and throwing machine) to be as uniform as possible, stacking for reaction for 24-48h, and adding the lime powder according to 5-10wt% of the dry basis weight of the waste pit mud. The lime is quicklime (CaO) powder, and the fineness of the lime is required to be more than 150 meshes.
In another preferred embodiment of the present invention, the deodorization is to treat the malodorous gas generated in the sterilization process so that the treated gas can reach the standard discharge value of the malodorous pollutant exhaust pipe and the standard value of the factory floor as specified in the discharge standard of malodorous pollutants (GB 14554-93).
Specifically, malodorous gases such as methane, ammonia gas, hydrogen sulfide and the like can be generated in the stacking reaction process, and a deodorizing system is adopted for hermetically collecting and installing the malodorous gases in the stacking area. The odor gas is conveyed to respective deodorization processing systems through stainless steel suction pipes for processing, deodorization is carried out by adopting two-stage spraying deodorization and photocatalytic oxidation integrated equipment, and the processed gas reaches an odor pollutant exhaust pipe emission standard value and a factory standard value specified in odor pollutant emission standard (GB 14554-93).
In another preferred embodiment of the invention, the drying and crushing are to crush the mixture obtained by sterilizing and deodorizing the waste pit mud to a particle size of less than 5mm, and dry the mixture until the water content is controlled to be less than 5wt% to obtain the pit mud soil material.
Specifically, the drying and crushing are to put the mixture obtained by sterilizing and deodorizing the waste pit mud into a bottomless sieve crusher, crush the mixture to a particle size smaller than 5mm, spread and dry the mixture, and dry the mixture if necessary. Controlling the water content below 5% for standby.
The raw soil building material based on the waste pit mud has the following characteristics that firstly, the quicklime is adopted to effectively kill harmful microorganisms in the waste pit mud, and the problems of excessive odor of ammonia nitrogen, methane, hydrogen sulfide and sulfur sulfide are solved by turning, stacking, installing, collecting and spraying a photocatalytic oxidation system, so that the harmless treatment is simple and effective, and the cost is low; secondly, the treated pit mud is prepared into a material for rammed earth buildings, the rammed earth buildings have the characteristics of being warm in winter and cool in summer and being dry and breathable, with the improvement of global tourism economy and consumption level, the trend of the formed trend of the raw earth buildings (rammed earth) in residences is realized, the raw earth buildings do not need to be sintered, the building speed is high, the operation is simple, the cost is low, the environment is protected, and the characteristics of innovation and resource utilization are realized.
As another preferred embodiment of the invention, the raw materials of the admixture comprise, by weight: 30-60 parts of slag powder, 8-18 parts of cement, 8-18 parts of calcium lignosulphonate, 8-18 parts of sodium carbonate, 8-18 parts of potassium silicate powder, 8-18 parts of calcium sulfate dihydrate, 2-12 parts of polyvinyl alcohol rubber powder and 2-10 parts of sodium sulfate.
As another preferred embodiment of the invention, the raw materials of the admixture comprise, by weight: 40-50 parts of slag powder, 10-15 parts of cement, 10-15 parts of calcium lignosulphonate, 10-15 parts of sodium carbonate, 10-15 parts of potassium silicate powder, 10-15 parts of calcium sulfate dihydrate, 5-10 parts of polyvinyl alcohol rubber powder and 5-8 parts of sodium sulfate.
As another preferred embodiment of the invention, the raw materials of the admixture comprise, by weight: 44-48 parts of slag powder, 12-14 parts of cement, 12-14 parts of calcium lignosulphonate, 12-14 parts of sodium carbonate, 12-14 parts of potassium silicate powder, 12-14 parts of calcium sulfate dihydrate, 6-8 parts of polyvinyl alcohol rubber powder and 6-7 parts of sodium sulfate.
As another preferred embodiment of the invention, the preparation method of the additive is that the slag powder, the calcium sulfate dihydrate, the cement, the calcium lignosulfonate, the sodium carbonate, the potassium silicate powder, the calcium sulfate dihydrate, the polyvinyl alcohol glue powder, the sodium sulfate and the like are weighed according to the proportion and are used as the excitant and the early strength agent to be mixed uniformly, so as to obtain the additive.
As another preferred embodiment of the invention, the slag powder is granulated blast furnace slag powder, which is called high-quality concrete admixture for short, and the granulated blast furnace slag meeting the GB/T203 standard is dried and ground to obtain powder with considerable fineness and meeting a considerable activity index.
Further, the slag powder is blast furnace granulated slag of smelting enterprises, is ground into S95-grade slag micro powder, and has a fine specific surface area of more than 400m2/Kg。
As another preferred embodiment of the present invention, the cement is 425 portland cement or 525 portland cement.
Preferably, the cement is 425 ordinary portland cement.
As another preferred embodiment of the present invention, the calcium sulfate dihydrate is selected from any one of natural gypsum, phosphogypsum or desulfurized gypsum; specifically, the calcium sulfate dihydrate is natural gypsum with the particle size of less than 200 meshes (the content of calcium sulfate is more than 75 percent), and can also be aged phosphogypsum or desulfurized gypsum.
As another preferred embodiment of the invention, the sodium carbonate is soda ash with the purity of not less than 99 percent and the mesh number is 80-160 meshes.
As another preferred embodiment of the invention, the polyvinyl alcohol glue powder is PVA (polyvinyl alcohol) powder with 80-160 meshes; the potassium silicate powder is cold water instant (such as RF powdery instant potassium silicate), the fineness is required to be 80-160 meshes, and the modulus is about 1.5.
As another preferred embodiment of the invention, the 28d (28 days) unconfined compressive strength of the raw soil building material based on the waste pit mud can reach 10-15 MPa.
As another preferred embodiment of the present invention, in the raw material of the raw soil building material based on the waste pit mud, the amount of the admixture is 10 to 15wt% of the mass of the pit mud material.
Another object of an embodiment of the present invention is to provide a method for preparing raw soil building material based on waste pit mud (that is, a method for preparing raw soil building material by using waste pit mud and other industrial wastes), wherein the method for preparing raw soil building material based on waste pit mud comprises the following steps: and weighing an additive and pit mud materials according to the proportion, and uniformly mixing to obtain the raw soil building material based on the waste pit mud.
Preferably, the preparation method of the raw soil building material based on the waste pit mud comprises the following steps:
putting the pit mud material obtained by pretreatment into a dry powder homogenizer through a conveying device, and adding additive powder with the proportion of 10-15wt% of the pit mud material;
stirring and homogenizing the pit mud materials and the additives at a high speed for 15-20 min;
and (5) performing damp-proof bagging by using a packaging machine to obtain the raw soil building material based on the waste pit mud, and leaving the factory as a raw soil building material finished product.
As another preferred embodiment of the present invention, the method for preparing the raw soil building material based on the waste pit mud further comprises the steps of weighing the admixture and the pit mud material according to the proportion, uniformly mixing, adding water, uniformly mixing, adding into a mold, and tamping.
As another preferred embodiment of the present invention, specifically, the method for preparing raw soil building material based on waste pit mud further comprises:
putting the raw soil building material finished product into a forced mixer, adding 15-18% of water (by weight of the raw soil building material finished product) by using a spraying device, and uniformly stirring for 10-20 min;
putting the uniformly stirred mixture into an installed mould, and generally controlling the paving thickness to be 10-15 cm;
tamping the paved soil by using rolling equipment such as a gasoline (electric) tamper, a pneumatic tamping hammer, a road roller and the like, wherein the tamping density is required to be more than 98%;
according to different engineering requirements, building waste aggregate or frameworks such as reinforcing steel bars can be added into the ramming layer;
and (4) removing the template after 2-7 days to obtain the cellar mud improved raw soil building, wherein the 28d unconfined compressive strength can reach 10-15Mpa generally.
In another preferred embodiment of the present invention, in the method for preparing the raw soil building material based on waste pit mud, the water may be any one selected from purified water, mineral water, distilled water, deionized water and soft water, and is not limited thereto and may be selected as needed, and deionized water is preferred.
The embodiment of the invention also aims to provide the raw soil building material based on the waste pit mud, which is prepared by the preparation method of the raw soil building material based on the waste pit mud.
It should be noted that the high-quality raw soil building material based on the waste pit mud obtained by the invention also has the following advantages: the invention has the uniqueness of the additive formula, increases the caking property of the waste pit mud by using polyvinyl alcohol so as to improve the compactness and the strength of the rammed earth building, improves the water resistance by using components such as potassium silicate and the like, solves the problem of water resistance of the traditional rammed earth process, improves the alkaline environment promotion strength required by hydration by using the combination of slag, cement and gypsum and by using activators such as sodium carbonate and potassium silicate and the like, improves the early strength by adding sodium sulfate so as to ensure that the rammed earth building has high strength and good structure, solves the problems of easy cracking and the like of the common rammed earth technology, and has main technical indexes completely exceeding related standards.
Moreover, the raw soil material has wide application, mainly comes from the advantages of available local materials, degradability and regeneration, simple construction, low cost, outstanding thermal performance, low energy consumption and no pollution in the processing process, and the like. However, the waste pit mud directly used for preparing raw soil building materials has the major defects in the aspects of durability, mechanical property and the like of the traditional raw soil materials, the clay resources can be effectively saved and natural resources can be protected after the waste pit mud is subjected to harmless treatment, the raw soil building materials are produced, the application prospect is good, meanwhile, the water resistance and freezing resistance of the raw soil building materials can be greatly improved through a series of additives, the strength and the structure are greatly improved, and particularly, from the perspective of current ecological sustainable development, the waste pit mud contains huge ecological application potential.
The embodiment of the invention also aims to provide application of the raw soil building material based on the waste pit mud in building construction.
As another preferred embodiment of the invention, the application can be that the paved raw soil building material based on the waste pit mud is compacted by using rolling equipment such as a gasoline (electric) tamper, a pneumatic tamper, a road roller and the like, and the compaction density is required to be more than 98%; and building waste aggregate or frameworks such as reinforcing steel bars can be added into the rammed layer according to different engineering requirements, and the template is removed after 2-7d to obtain the cellar mud-improved raw soil building, wherein the 28d unconfined compressive strength can reach 10-15Mpa generally, and the efficient resource utilization of the waste cellar mud can be promoted.
The technical effects of the raw soil building material based on waste pit mud of the present invention will be further described below by referring to specific examples. In order to verify the safety of the raw soil building material based on the waste pit mud, the waste pit mud of 10 brewing enterprises in a certain city of Guizhou is subjected to technical analysis, and leaching toxicity detection and comparison of related indexes of Integrated wastewater discharge Standard (GB 8978 one 1996) are performed by using a solid waste leaching toxicity leaching method horizontal oscillation method (HJ557-2009) and a solid waste leaching toxicity leaching method/sulfuric acid-nitric acid method (HJ299-2007), so that cadmium, lead, chromium, mercury, nickel and arsenic, which are toxic heavy metals, do not exceed pollutant standard limits, and the waste pit mud belongs to class I general industrial solid wastes. The safety of pit mud materials, namely the pit mud materials, which are used as main raw materials for preparing raw soil building materials (raw soil building materials), is ensured to a certain extent. The raw materials of the waste pit mud used in the following are red waste pit mud of the same item, and the maximum dry density of the waste pit mud is determined by a compaction test to be 1980 g/cubic centimeter, the optimum water content is 16.8 percent, and the plasticity index is 35.
Example 1
A raw soil building material based on waste pit mud is prepared by the following specific preparation method (shown in reference to fig. 1-2):
1) putting the collected waste pit mud containing certain moisture in a stacking area, adding lime powder (5 wt% of the weight of the waste pit mud dry base material), stirring by using a turner, uniformly mixing, and stacking for 48 h.
2) Malodorous gases such as methane, ammonia gas, hydrogen sulfide and the like can be generated in the stacking reaction process, and the odor in the stacking area is collected in a closed way and is provided with a deodorization system. The malodorous gas is conveyed to respective deodorization processing systems by a stainless steel suction pipe for collection, and is deodorized by adopting a two-stage spraying deodorization and photocatalytic oxidation integrated device, so that the gas after the malodorous gas treatment for eliminating methane, ammonia gas, hydrogen sulfide and the like reaches the discharge standard value of a malodorous pollutant exhaust funnel and the standard value of a factory floor specified in the malodorous pollutant discharge standard (GB 14554-93).
3) And (3) putting the mixture obtained after deodorization into a bottomless sieve crusher, crushing the mixture until the particle size is smaller than 5mm, spreading and airing, controlling the water content to be below 5wt% to obtain pit mud materials, and conveying the pit mud materials into a raw material tank for later use.
4) Preparing an additive, specifically weighing the following substances: 40 kg of slag powder, 10 kg of cement, 10 kg of calcium lignosulfonate, 10 kg of sodium carbonate, 10 kg of potassium silicate powder, 10 kg of aged phosphogypsum, 5 kg of polyvinyl alcohol rubber powder and 5 kg of sodium sulfate. Mixing the components by using a high-speed dry powder homogenizer for 20min to obtain the additive, and conveying the additive to a raw material tank for later use.
5) And (3) putting the treated pit mud material into a dry powder homogenizing machine through a conveying device, adding an additive (powder) with the pit mud material proportion of 10wt%, stirring and homogenizing at a high speed for 20min, and then carrying out damp-proof bagging by a packaging machine to obtain a raw soil building material finished product which leaves a factory, namely the raw soil building material based on the waste pit mud.
In the embodiment, when the raw soil building material based on the waste pit mud is used, the prepared raw soil building material finished product is put into a forced mixer, water is added from a spraying device (the added water amount is 18 wt% of the weight of the raw soil building material finished product), the mixture is uniformly stirred for 10min, and then the mixture is put into an installed mould, and the general paving thickness is controlled to be about 15 cm; tamping by using a gasoline (electric) tamper, wherein the tamping density is more than 98%; and (3) removing the template after 3d to obtain the cellar mud improved raw soil building, wherein the 28d unconfined compressive strength can reach 10.2 Mpa.
Example 2
A raw soil building material based on waste pit mud is prepared by the following specific preparation method (shown in reference to fig. 1-2):
1) placing the collected waste pit mud containing certain moisture in a stacking area, adding lime powder (10 wt% of the weight of the waste pit mud dry base material), stirring by using a turner, uniformly mixing, and stacking for 48 h.
2) Malodorous gases such as methane, ammonia gas, hydrogen sulfide and the like can be generated in the stacking reaction process, and the odor in the stacking area is collected in a closed way and is provided with a deodorization system. The malodorous gas is conveyed to respective deodorization processing systems by a stainless steel suction pipe for collection, and is deodorized by adopting a two-stage spraying deodorization and photocatalytic oxidation integrated device, so that the gas after the malodorous gas treatment for eliminating methane, ammonia gas, hydrogen sulfide and the like reaches the discharge standard value of a malodorous pollutant exhaust funnel and the standard value of a factory floor specified in the malodorous pollutant discharge standard (GB 14554-93).
3) And (3) putting the mixture obtained after deodorization into a bottomless sieve crusher, crushing the mixture until the particle size is smaller than 5mm, spreading and airing, controlling the water content to be below 5wt% to obtain pit mud materials, and conveying the pit mud materials into a raw material tank for later use.
4) Preparing an additive, specifically weighing the following substances: 40 kg of slag powder, 10 kg of cement, 10 kg of calcium lignosulfonate, 10 kg of sodium carbonate, 10 kg of potassium silicate powder, 10 kg of aged phosphogypsum, 5 kg of polyvinyl alcohol rubber powder and 5 kg of sodium sulfate. Mixing the components by using a high-speed dry powder homogenizer for 20min to obtain the additive, and conveying the additive to a raw material tank for later use.
5) And (3) putting the treated pit mud material into a dry powder homogenizing machine through a conveying device, adding an additive (powder) with the pit mud material proportion of 15wt%, stirring and homogenizing at a high speed for 20min, and then carrying out damp-proof bagging by a packaging machine to obtain a finished raw soil building material product, namely the raw soil building material based on the waste pit mud.
In the embodiment, when the raw soil building material based on the waste pit mud is used, the prepared raw soil building material finished product is put into a forced mixer, water is added from a spraying device (the added water amount is 18 wt% of the weight of the raw soil building material finished product), the mixture is uniformly stirred for 10min, and then the mixture is put into an installed mould, and the general paving thickness is controlled to be about 15 cm; tamping by using a gasoline (electric) tamper, wherein the tamping density is more than 98%; and (3) removing the template after 3d to obtain the cellar mud improved raw soil building, wherein the 28d unconfined compressive strength can reach 15.01 Mpa. It can be seen that when the admixture is increased by 15wt%, the compressive strength is greatly improved as compared with example 2.
Example 3
The raw soil building material based on the waste pit mud is prepared by the following specific preparation method (shown in figure 2):
1) placing the collected waste pit mud containing certain moisture in a stacking area, adding lime powder (10 wt% of the weight of the waste pit mud dry base material), stirring by using a turner, uniformly mixing, and stacking for 48 h.
2) Malodorous gases such as methane, ammonia gas, hydrogen sulfide and the like can be generated in the stacking reaction process, and the odor in the stacking area is collected in a closed way and is provided with a deodorization system. The malodorous gas is conveyed to respective deodorization processing systems by a stainless steel suction pipe for collection, and is deodorized by adopting a two-stage spraying deodorization and photocatalytic oxidation integrated device, so that the gas after the malodorous gas treatment for eliminating methane, ammonia gas, hydrogen sulfide and the like reaches the discharge standard value of a malodorous pollutant exhaust funnel and the standard value of a factory floor specified in the malodorous pollutant discharge standard (GB 14554-93).
3) And (3) putting the mixture obtained after deodorization into a bottomless sieve crusher, crushing the mixture until the particle size is smaller than 5mm, spreading and airing, controlling the water content to be below 5wt% to obtain pit mud materials, and conveying the pit mud materials into a raw material tank for later use.
4) Preparing an additive, specifically weighing the following substances: 45 kg of slag powder, 10 kg of cement, 8 kg of calcium lignosulfonate, 7 kg of sodium carbonate, 7 kg of potassium silicate powder, 15 kg of aged phosphogypsum, 5 kg of polyvinyl alcohol rubber powder and 3 kg of sodium sulfate. Mixing the components by using a high-speed dry powder homogenizer for 20min to obtain the additive, and conveying the additive to a raw material tank for later use.
5) And (3) putting the treated pit mud material into a dry powder homogenizer through a conveying device, adding an additive (powder) with the pit mud material proportion of 12 wt%, stirring and homogenizing at a high speed for 20min, and then carrying out damp-proof bagging by a packaging machine to obtain a raw soil building material finished product which leaves a factory, namely the raw soil building material based on the waste pit mud.
In the embodiment, when the raw soil building material based on the waste pit mud is used, the prepared raw soil building material finished product is put into a forced mixer, water is added from a spraying device (the added water amount is 18 wt% of the weight of the raw soil building material finished product), the mixture is uniformly stirred for 10min, and then the mixture is put into an installed mould, and the general paving thickness is controlled to be about 15 cm; tamping by using a gasoline (electric) tamper, wherein the tamping density is more than 98%; and (5) removing the template after 5d to obtain the cellar mud improved raw soil building, wherein the 28d unconfined compressive strength can reach 12.6 Mpa. Therefore, when the mixing amount of the industrial solid waste slag and the phosphogypsum in the additive is respectively increased by 5 percent, the using dosage of the additive is 12 percent by weight, the stripping time is 5 days, and the strength is also good.
Example 4
In order to increase the utilization of solid wastes, the embodiment provides a raw soil building material based on waste pit mud, and the specific preparation method is as follows (see fig. 2):
1) placing the collected waste pit mud containing certain moisture in a stacking area, adding lime powder (10 wt% of the weight of the waste pit mud dry base material), stirring by using a turner, uniformly mixing, and stacking for 48 h.
2) Malodorous gases such as methane, ammonia gas, hydrogen sulfide and the like can be generated in the stacking reaction process, and the odor in the stacking area is collected in a closed way and is provided with a deodorization system. The malodorous gas is conveyed to respective deodorization processing systems by a stainless steel suction pipe for collection, and is deodorized by adopting a two-stage spraying deodorization and photocatalytic oxidation integrated device, so that the gas after the malodorous gas treatment for eliminating methane, ammonia gas, hydrogen sulfide and the like reaches the discharge standard value of a malodorous pollutant exhaust funnel and the standard value of a factory floor specified in the malodorous pollutant discharge standard (GB 14554-93).
3) And (3) putting the mixture obtained after deodorization into a bottomless sieve crusher, crushing the mixture until the particle size is smaller than 5mm, spreading and airing, controlling the water content to be below 5wt% to obtain pit mud materials, and conveying the pit mud materials into a raw material tank for later use.
4) Preparing an additive, specifically weighing the following substances: 45 kg of slag powder, 10 kg of cement, 8 kg of calcium lignosulfonate, 7 kg of sodium carbonate, 7 kg of potassium silicate powder, 15 kg of aged phosphogypsum, 5 kg of polyvinyl alcohol rubber powder and 3 kg of sodium sulfate. Mixing the components by using a high-speed dry powder homogenizer for 20min to obtain the additive, and conveying the additive to a raw material tank for later use.
5) And (3) putting the treated pit mud material into a dry powder homogenizing machine through a conveying device, adding an additive (powder) with the pit mud material proportion of 15wt%, stirring and homogenizing at a high speed for 20min, and then carrying out damp-proof bagging by a packaging machine to obtain a finished raw soil building material product, namely the raw soil building material based on the waste pit mud.
In the embodiment, when the raw soil building material based on the waste pit mud is used, the prepared raw soil building material finished product is put into a forced mixer, water is added from a spraying device (the added water amount is 18 wt% of the weight of the raw soil building material finished product), the mixture is uniformly stirred for 10min, and then the mixture is put into an installed mould, and the general paving thickness is controlled to be about 15 cm; tamping by using a gasoline (electric) tamper, wherein the tamping density is more than 98%; and (5) removing the template after 5d to obtain the cellar mud improved raw soil building, wherein the 28d unconfined compressive strength can reach 13.9 Mpa. Therefore, when the mixing amount of the industrial solid waste slag and the phosphogypsum in the additive is respectively increased by 5 percent, the using amount of the additive is 15 percent by weight, the stripping time is 5 days, and the strength is improved by 10.3 percent compared with that of the embodiment 3.
Example 5
The raw soil building material based on the waste pit mud is prepared by the following specific preparation method (shown in figure 2):
1) placing the collected waste pit mud containing certain moisture in a stacking area, adding lime powder (10 wt% of the weight of the waste pit mud dry base material), stirring by using a turner, uniformly mixing, and stacking for 48 h.
2) Malodorous gases such as methane, ammonia gas, hydrogen sulfide and the like can be generated in the stacking reaction process, and the odor in the stacking area is collected in a closed way and is provided with a deodorization system. The malodorous gas is conveyed to respective deodorization processing systems by a stainless steel suction pipe for collection, and is deodorized by adopting a two-stage spraying deodorization and photocatalytic oxidation integrated device, so that the gas after the malodorous gas treatment for eliminating methane, ammonia gas, hydrogen sulfide and the like reaches the discharge standard value of a malodorous pollutant exhaust funnel and the standard value of a factory floor specified in the malodorous pollutant discharge standard (GB 14554-93).
3) And (3) putting the mixture obtained after deodorization into a bottomless sieve crusher, crushing the mixture until the particle size is smaller than 5mm, spreading and airing, controlling the water content to be below 5wt% to obtain pit mud materials, and conveying the pit mud materials into a raw material tank for later use.
4) Preparing an additive, specifically weighing the following substances: 40 kg of slag powder, 10 kg of cement, 10 kg of calcium lignosulphonate, 10 kg of sodium carbonate, 10 kg of potassium silicate powder, 10 kg of desulfurized gypsum, 5 kg of polyvinyl alcohol rubber powder and 5 kg of sodium sulfate. Mixing the components by using a high-speed dry powder homogenizer for 20min to obtain the additive, and conveying the additive to a raw material tank for later use.
5) And (3) putting the treated pit mud material into a dry powder homogenizing machine through a conveying device, adding an additive (powder) with the pit mud material proportion of 10wt%, stirring and homogenizing at a high speed for 20min, and then carrying out damp-proof bagging by a packaging machine to obtain a raw soil building material finished product which leaves a factory, namely the raw soil building material based on the waste pit mud.
In the embodiment, when the raw soil building material based on the waste pit mud is used, the prepared raw soil building material finished product is put into a forced mixer, water is added from a spraying device (the added water amount is 18 wt% of the weight of the raw soil building material finished product), the mixture is uniformly stirred for 10min, and then the mixture is put into an installed mould, and the general paving thickness is controlled to be about 15 cm; tamping by using a gasoline (electric) tamper, wherein the tamping density is more than 98%; and (5) removing the template after 5d to obtain the cellar mud improved raw soil building, wherein 28d unconfined compressive strength can reach 11.2 Mpa. Therefore, when the phosphogypsum is replaced by the desulfurized gypsum in the additive, the dosage of the additive is 10wt%, the demold time is 5d, and the strength is improved by 10.9% compared with that of the example 1.
Example 6
The same as example 5 was conducted except that the admixture (powder) was added in an amount of 15% by weight based on the concrete weight of the pit mud in comparison with example 5. Correspondingly, when the obtained raw soil building material based on the waste pit mud is used, the prepared raw soil building material based on the waste pit mud is put into a forced mixer, water is added from a spraying device (the water adding amount is 18 wt% of the weight of the raw soil building material based on the waste pit mud), the mixture is uniformly stirred for 10min, and then the mixture is put into an installed die, and the spreading thickness is generally controlled to be about 15 cm; tamping by using a gasoline (electric) tamper, wherein the tamping density is more than 98%; and (3) removing the template after 3d to obtain the cellar mud improved raw soil building, wherein the 28d unconfined compressive strength can reach 15.4 Mpa. Therefore, when the phosphogypsum is replaced by the desulfurized gypsum in the additive, the dosage of the additive is 15wt%, the demold time is 5d, and the strength is improved by 2.7% compared with that of the example 2.
Example 7
In this example, in order to investigate the influence of different preparation processes on the product performance, the compressive strength performance of the cellar mud improved raw soil buildings prepared in examples 1-6 was counted, and the specific results are shown in table 1.
TABLE 1 Effect of different preparation Processes on product Properties
In table 1, the main indices of the examples are: the unconfined compressive strength ratio is more than or equal to 120 percent, the water stability coefficient ratio is more than or equal to 105 percent, and the setting time influence coefficient ratio is more than or equal to 100 percent, and completely meets the main technical indexes of the solidified soil CJ/T486-2015 soil solidifying agent admixture.
Example 8
A raw soil building material based on waste pit mud is prepared by the following specific preparation method (shown in figure 1):
1) and sterilizing, deodorizing, drying and crushing the collected waste pit mud containing certain moisture to obtain a material with the water content of 4 wt% and the particle size of 4mm, namely the treated pit mud soil material, and sending the treated pit mud soil material into a raw material tank for later use.
2) Preparing an additive, specifically weighing the following substances: 40 kg of slag powder, 10 kg of cement, 10 kg of calcium lignosulfonate, 10 kg of sodium carbonate, 10 kg of potassium silicate powder, 10 kg of aged phosphogypsum, 5 kg of polyvinyl alcohol rubber powder and 5 kg of sodium sulfate. Mixing the components by using a high-speed dry powder homogenizer for 20min to obtain the additive, and conveying the additive to a raw material tank for later use.
2) And (3) putting the treated pit mud material into a dry powder homogenizing machine through a conveying device, adding an additive (powder) with the pit mud material proportion of 10wt%, stirring and homogenizing at a high speed for 20min, and then carrying out damp-proof bagging by a packaging machine to obtain a raw soil building material finished product which leaves a factory, namely the raw soil building material based on the waste pit mud.
In the embodiment, when the raw soil building material based on the waste pit mud is used, the prepared raw soil building material finished product is put into a forced mixer, water is added from a spraying device (the added water amount is 18 wt% of the weight of the raw soil building material finished product), the mixture is uniformly stirred for 10min, and then the mixture is put into an installed mould, and the general paving thickness is controlled to be about 15 cm; tamping by using a gasoline (electric) tamper, wherein the tamping density is more than 98%; and 3d, removing the template to obtain the raw soil building improved by the pit mud.
Example 9
The same as example 8 except that the water content of the pit mud material was 4.9 wt% and the particle size was 4.9mm, compared to example 8.
Example 10
The same as example 8 except that the water content of the pit soil was 3 wt% and the particle size was 3mm, compared to example 8.
Example 11
The same as example 8 except that the water content of the pit soil was 2 wt% and the particle size was 2mm, compared to example 8.
Example 12
The same as example 8 except that the water content of the pit soil was 1 wt% and the particle size was 1mm, compared to example 8.
Example 13
The same as example 8 except that the water content of the pit soil was 5wt% and the particle size was 2mm, compared to example 8.
Example 14
Compared with the embodiment 5, the method is the same as the embodiment 5 except that the addition amount of the lime powder is 5wt% of the dry weight of the waste pit mud and the stacking reaction time is 40 h.
Example 15
Compared with the example 5, the method is the same as the example 5 except that the addition amount of the lime powder is 10wt% of the dry-based weight of the waste pit mud, and the stacking reaction time is 30 h.
Example 16
Compared with the example 5, the method is the same as the example 5 except that the addition amount of the lime powder is 7 wt% of the dry-based weight of the waste pit mud, and the stacking reaction time is 24 h.
Example 17
Compared with the embodiment 5, the method is the same as the embodiment 5 except that the addition amount of the lime powder is 9 wt% of the dry weight of the waste pit mud.
Example 18
Compared with the example 5, except that the raw materials of the admixture comprise: 30 parts of slag powder, 8 parts of 425 ordinary portland cement, 8 parts of calcium lignosulfonate, 8 parts of sodium carbonate, 8 parts of potassium silicate powder, 8 parts of aged phosphogypsum, 2 parts of polyvinyl alcohol rubber powder and 2 parts of sodium sulfate. The rest is the same as in example 5.
Example 19
Compared with the example 5, except that the raw materials of the admixture comprise: 60 kg of slag powder, 18 kg of 425 ordinary portland cement, 18 kg of calcium lignosulfonate, 18 kg of sodium carbonate, 18 kg of potassium silicate powder, 18 kg of aged desulfurized gypsum, 12 kg of polyvinyl alcohol rubber powder and 10 kg of sodium sulfate. The rest is the same as in example 5.
Example 20
Compared with the example 5, except that the raw materials of the admixture comprise: 40 kg of slag powder, 10 kg of cement, 10 kg of calcium lignosulphonate, 10 kg of sodium carbonate, 10 kg of potassium silicate powder, 10 kg of natural gypsum, 5 kg of polyvinyl alcohol rubber powder and 5 kg of sodium sulfate. The rest is the same as in example 5.
Example 21
Compared with the example 5, except that the raw materials of the admixture comprise: 50 kg of slag powder, 15 kg of cement, 15 kg of calcium lignosulphonate, 15 kg of sodium carbonate, 15 kg of potassium silicate powder, 15 kg of natural gypsum, 10 kg of polyvinyl alcohol rubber powder and 8 kg of sodium sulfate. The rest is the same as in example 5.
Example 22
Compared with the example 5, except that the raw materials of the admixture comprise: 44 kg of slag powder, 12 kg of cement, 12 kg of calcium lignosulfonate, 12 kg of sodium carbonate, 12 kg of potassium silicate powder, 12 kg of aged phosphogypsum, 6 kg of polyvinyl alcohol rubber powder and 6 kg of sodium sulfate. The rest is the same as in example 5.
Example 23
Compared with the example 5, except that the raw materials of the admixture comprise: 48 kg of slag powder, 14 kg of cement, 14 kg of calcium lignosulfonate, 14 kg of sodium carbonate, 14 kg of potassium silicate powder, 14 kg of aged phosphogypsum, 8 kg of polyvinyl alcohol rubber powder and 7 kg of sodium sulfate. The rest is the same as in example 5.
Example 24
In this example, the raw soil test piece was subjected to a comparative test on the product ratio obtained by the process using different admixtures and cementitious materials and the product obtained by the method of the present invention. During testing, the used raw materials are red waste pit mud with the same item, the maximum dry density of the pit mud is measured by a compaction test to be 1980 g/cubic centimeter, the optimal water content is 16.8 percent, and the plasticity index is 35, and the test piece is formed by one-time hydraulic molding. The test block size is 50 multiplied by 50mm, the compactness is 99%, 4 groups of each process work are provided, each group comprises 6, and the total number is 24, and after the test, the detection of 7d unconfined compressive strength, 28d unconfined compressive strength, 7d water absorption and 28d 25F freeze-thaw strength loss rate is carried out to obtain an average value. The results of the specific different process ratios and the soil test piece contrast test performed by the method of the present invention are shown in table 2.
TABLE 2 comparison table of main technical indexes of products of the present invention and other processes
The data according to table 2 show that: the indexes of the method of the invention are greatly superior to those of the traditional three-in-one soil process, and particularly the method has the advantage of increasing the compressive strength. The main performance is also superior to that of common cement stabilized soil. Compared with other brands of soil curing agents (liquid and powder) as the additives, the soil curing agent has the advantages of higher strength, smaller water absorption, better freeze-thaw resistance and longer service life.
The invention can completely use the waste pit mud for raw soil building materials, thoroughly realize zero pollution, harmlessness and complete resource comprehensive utilization, the prepared raw soil building materials based on the waste pit mud have the guarantee of soil engineering performance, the industrial standardized production is adopted, the waste pit mud is selected for pretreatment and improvement, the soil materials are accurately measured according to the indexes such as particle size, liquid limit, plastic dry density, optimal water content and the like, the waste pit mud is uniformly and quickly dried, the formula and the proportion of the additive are unified, the additive and the soil materials are uniformly mixed, the problems of field water content control and the like are solved by determining the unified standard use dosage and the accurate water adding proportion, the problems that the soil cannot be quickly dried due to factors such as weather, field and the like in the original soil ramming technology (adopting field soil) and the uniform mixing cannot be realized before construction are thoroughly solved, so that the effect of the soil admixture can not be achieved and the phenomenon of unstable engineering quality occurs.
On the other hand, the raw soil building material based on the waste pit mud has construction convenience, the raw soil material is processed and packaged in a factory, the problem that the soil is difficult to take on a construction site is solved, at present, many users needing rammed soil building generally select a few soil places such as mountains, rocks, lakes and the like, and the construction period is greatly shortened by using the packaged soil material to transport to the site; moreover, the problem of large-scale recycling of the waste pit mud is solved, and the treated pit mud serving as a raw soil building material is rammed into an ecological residential building and has a unique environment-friendly concept. The general rammed earth building needs to consume 0.8-1 ton of soil per square, a rammed earth residence with a building area of 300 square needs 500 plus 800 tons, if the rammed earth building is a road, 0.4 ton of soil is consumed per square (calculated according to 20 cm), and 4000 plus 5000 tons of waste pit mud can be consumed according to 4m width of a general rural road and only one 3km road base layer; in addition, the invention is a comprehensive solution of industrial solid wastes, 40-50% of slag of smelting enterprises is consumed in the components of the additive, and 10-15% of phosphogypsum or desulfurized gypsum (non-calcined) is consumed, so that the additive has great significance for environmental protection.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. The raw soil building material based on the waste pit mud is characterized by comprising the following raw materials: additive and pit mud material; the pit mud soil material is a material with the water content of below 5wt% obtained by pretreating waste pit mud; the raw materials of the additive comprise slag powder, cement, calcium lignosulphonate, sodium carbonate, potassium silicate powder, calcium sulphate dihydrate, polyvinyl alcohol rubber powder and sodium sulphate.
2. The waste pit mud-based raw soil building material of claim 1, wherein the 28-day unconfined compressive strength of the waste pit mud-based raw soil building material is 10-15 Mpa.
3. The raw soil building material based on waste pit mud as claimed in claim 1, wherein the pretreatment comprises sterilizing, deodorizing, drying and crushing the waste pit mud to obtain a material with a water content of less than 5wt% and a particle size of less than 5 mm.
4. The raw soil building material based on the waste pit mud as claimed in claim 3, wherein the sterilization is to add lime powder which is 5-10wt% of the dry weight of the waste pit mud into the waste pit mud, to mix uniformly and to carry out stacking reaction; the deodorization is to treat the malodorous gas generated in the sterilization process; and the drying and crushing are to crush the mixture obtained by sterilizing and deodorizing the waste pit mud until the particle size is less than 5mm and dry the mixture until the water content is less than 5 wt%.
5. The raw soil building material based on waste pit mud as claimed in claim 1, wherein the raw materials of the admixture comprise, by weight: 40-50 parts of slag powder, 10-15 parts of cement, 10-15 parts of calcium lignosulphonate, 10-15 parts of sodium carbonate, 10-15 parts of potassium silicate powder, 10-15 parts of calcium sulfate dihydrate, 5-10 parts of polyvinyl alcohol rubber powder and 5-8 parts of sodium sulfate.
6. The raw soil building material based on waste pit mud as claimed in claim 1, wherein the raw materials of the admixture comprise, by weight: 44-48 parts of slag powder, 12-14 parts of cement, 12-14 parts of calcium lignosulphonate, 12-14 parts of sodium carbonate, 12-14 parts of potassium silicate powder, 12-14 parts of calcium sulfate dihydrate, 6-8 parts of polyvinyl alcohol rubber powder and 6-7 parts of sodium sulfate.
7. The raw soil building material based on waste pit mud as set forth in claim 1, wherein the calcium sulfate dihydrate is selected from any one of natural gypsum, phosphogypsum or desulfurized gypsum; the meshes of the sodium carbonate, the potassium silicate powder and the polyvinyl alcohol rubber powder are all 80-160 meshes.
8. The waste pit mud-based raw soil building material as claimed in claim 1, wherein the amount of said admixture used in the raw material of said waste pit mud-based raw soil building material is 10-15wt% based on the mass of said pit mud material.
9. A method for preparing a raw soil building material based on waste pit mud as claimed in any one of claims 1-8, comprising the steps of: and weighing an additive and pit mud materials according to the proportion, and uniformly mixing to obtain the raw soil building material based on the waste pit mud.
10. Use of the raw soil building material based on waste pit mud as claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8 in building construction.
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