CN107805018B - Self-compacting road backfill material produced by stone saw mud and construction method thereof - Google Patents

Self-compacting road backfill material produced by stone saw mud and construction method thereof Download PDF

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CN107805018B
CN107805018B CN201711028844.7A CN201711028844A CN107805018B CN 107805018 B CN107805018 B CN 107805018B CN 201711028844 A CN201711028844 A CN 201711028844A CN 107805018 B CN107805018 B CN 107805018B
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stone
backfill material
mud
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CN107805018A (en
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张金喜
王美霞
王琳
王建刚
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Beijing University of Technology
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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
    • C04B28/02—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 hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/18—Making embankments, e.g. dikes, dams
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials

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  • Chemical & Material Sciences (AREA)
  • Mining & Mineral Resources (AREA)
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  • Ceramic Engineering (AREA)
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  • Inorganic Chemistry (AREA)
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  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a self-compacting road backfill material produced by stone saw mud and a construction method thereof. Through the performance analysis of raw materials, the characteristic of smooth surface of the self-compacting backfill material is known and fully utilized, the bleeding rate is not increased under the same water consumption, the fluidity is enhanced, and the working workability of the self-compacting backfill material is met. The hardened compressive strength meets the construction requirements, the strength is between 0.34MPa and 0.45MPa in 1 day, the strength is between 1.0MPa and 1.8MPa in 7 days, and the strength is between 2.4MPa and 3.6MPa in 28 days. The invention is suitable for the engineering that the vibration compaction construction can not be carried out by large-scale machinery in the narrow area of the highway and the municipal engineering.

Description

Self-compacting road backfill material produced by stone saw mud and construction method thereof
Technical Field
The invention relates to a road engineering material, in particular to a low-strength self-compacting road backfill material produced by replacing fly ash with stone saw mud, which is suitable for the engineering that the vibration compaction construction can not be carried out by large-scale machinery or narrow areas in the highway and municipal engineering.
Background
In recent years, with the rapid development of economy in China, the production quantity, the import and export quantity and the consumption quantity of stone resources are obviously increased, abundant mine resources drive the development of economy and society in regions, but a large amount of solid powdery wastes are generated in the stone processing production process, different stone processing technologies and different stone processing products generate different types of wastes, but the initial state is a mixture of micro stone powder and water and is similar to a sludge state, so the stone saw mud is commonly called as stone saw mud. The stone industry is a resource processing type industry, and about half of stone raw materials become waste from raw material processing to finished products. According to related data, the stone processing factory in one town of sunshine city in Shandong province reaches more than 190, the stone sawing mud generation amount reaches hundreds of thousands of cubic meters per year, six large waste storage yards are formed, a large amount of land resources are occupied, certain potential safety hazards exist, and the phenomena of flowing, collapse, landslide and the like are easy to generate. According to related reports, about 230 million tons of stone sawing mud are generated by a certain group in Taiyuan city of Shanxi province each year since the ore mining and processing process, the stone sawing mud is stacked in a large scale, serious environmental pollution is caused, and water sources, atmosphere, soil and the like are damaged.
Meanwhile, various exploration researches on the recycling of the stone sawn mud are carried out at home and abroad, and the stone sawn mud is used as a raw material for producing ceramics, heat-insulating walls and the like, and although good effects are obtained, the stone sawn mud has low market demand and is not remarkable in popularization effect. In order to meet the requirements of energy conservation and environmental protection, granite is mainly used at home and abroad, and relevant application of the granite in the field of concrete is researched, for example, granite is used for replacing sandstone in concrete ingredients, so that hollow bricks meeting performance requirements can be produced, and the demand pressure of the building material market on mineral admixtures is relieved. In recent years, great progress has been made at home and abroad in the aspect of recycling granite powder, but the production cost is higher, the production technology is complex, and the application range is not very wide. The utilization and the exertion of the value of the stone saw mud not only can improve the environment of corresponding areas and promote the industrial transformation of the areas, but also can be used for road engineering, thereby facilitating the local materials of related construction units, saving the material cost, the transportation cost and the like, and having more reasonable economic and social values.
Disclosure of Invention
Aiming at the problems, the invention recycles solid powdery wastes such as stone saw mud and the like generated in the processing process of stone plates. The selected stone sawing mud is taken from a stone sawing mud stacking field which is subjected to environment-friendly treatment and then is stacked in the open air. The invention aims to: 1. the invention relates to a self-compacting backfill material produced by using stone saw mud, which widens a new way for recycling the stone saw mud; 2. the bleeding problem of common materials in the self-compacting backfill material is improved. 3. The situation of stacking a large amount of stone saw mud is improved, effective resources are fully utilized, and unnecessary waste of the stone saw mud is reduced.
In order to achieve the purpose, the invention adopts the technical scheme that the self-compacting road backfill material is produced by using stone saw mud, and the backfill material is prepared by mixing and stirring the stone saw mud, cement, an admixture and water. Through the performance analysis of raw materials, the characteristic of smooth surface of the self-compacting backfill material is known and fully utilized, the bleeding rate is not increased under the same water consumption, the fluidity is enhanced, and the working workability of the self-compacting backfill material is met. The hardened compressive strength meets the construction requirements, the strength is between 0.34MPa and 0.45MPa in 1 day, the strength is between 1.0MPa and 1.8MPa in 7 days, and the strength is between 2.4MPa and 3.6MPa in 28 days.
The backfill material comprises the following components in percentage by weight, and the guidance range is shown in table 1:
TABLE 1 guidance range of each component and its amount of self-compacting backfill material produced by stone saw mud
Figure GDA0002403660800000021
Note: the fine aggregate is machine-made sand, and the construction waste is suitable for regenerating fine aggregate, sand and the like in engineering application; the mixing amount is the percentage of the fine aggregate.
The cement is PC42.5 composite Portland cement, and the cement dosage is reasonably selected according to construction level, design indexes and the like.
The fine aggregate is machine-made sand.
The stone sawing mud is an industrial byproduct which is generated by processing stone and is piled in the open after being subjected to environmental protection treatment. The mineral composition is quartz (SiO)2) Phlogopite (KMg)3(Si3Al)O10(OH)2) And feldspar minerals; the feldspar mineral includes CaO and Na2O、SiO2、AL2O3Potassium feldspar (KAlSi)3O8) Etc., quartz, phlogopite, (Ca, Na) O2And potassium feldspar accounting for 33.1%, 21.6%, 23.8%, 12.6% and the like respectively. The main chemical component is SiO2And AL2O3，SiO2、AL2O3The mass percentages are 67.3 percent and 15.6 percent respectively. The stone sawing mud has low water content, fineness of 24.8%, particle size of 80 μm, angular shape, smooth surface, and same appearance characteristics as crushed stone particles.
The backfill materials are all dry in mass.
The water is drinkable tap water.
The invention provides a specific measuring instrument device and a measuring method for a self-compacting backfill material produced by using stone saw mud, which comprises the following steps: the workability and mechanical properties of the mixtures were measured in the road engineering aggregate test procedure (JTGE42-2005) and in the road engineering cement and cement concrete test procedure (JTGE 30-2005).
The working workability evaluation criteria of the self-compacting backfill material produced by using the stone sawn mud provided by the invention are shown in the attached table 2.
The self-compacting backfill material produced by using the stone saw mud can be prepared by the following method:
s1, measuring the fluidity of the flowable backfill material: reference is made to the test method established by ASTM in the united states for CLSM flowability. The test method is as follows: selecting a hollow cylinder rigid test mold with the diameter of 76 +/-3 mm and the height of 150 +/-3 mm, wiping water drops on the test mold by using a wet towel, placing the test mold on a glass plate, pouring a newly mixed mixture into the test mold, tapping the outer wall of the test mold, scraping the test mold along the upper edge of the test mold by using a scraper, quickly lifting the test mold, measuring the maximum slump expansion diameter and the vertical slump expansion diameter of the test mold, and taking the average value of the maximum slump expansion diameter and the vertical slump expansion diameter as the fluidity of the mixture.
S2, measuring the bleeding rate of the backfill material: the test was carried out with reference to "Standard test method for bleeding of Cement concrete mixture" (ASTMC 232/C232M-09). The test method is that a volumetric cylinder with the volume of 1L is adopted for testing, and the bleeding rate is equal to the ratio of the accumulated total bleeding amount to the water content of the mixture in the volumetric cylinder.
S3, measuring the compression strength of the flowable backfill material: refer to the cube compression strength test method in the building mortar basic performance test method Standard (JGJ/T70-2009). And (3) adopting a cube test mold with 70.7mm, injecting a flowing backfill material into the test mold, and lightly knocking the wall of the test mold to fully fill the mixture. After 24 hours, the mold is removed, and the sample is placed into a standard curing room for curing. The compression strength of the mix was tested at a standard age.
S4, determining the mixing ratio of the raw materials to the mixture:
after the raw materials are determined, the laboratory mix proportion design of the self-compacting backfill material produced by using the stone saw mud is carried out according to the following steps:
(1) determining the compressive strength F of the backfill material of the stone sawn mud roadcuThe unit is MPa and the unit of fluidity L is mm control index;
(2) drawing up the mass M of the fine aggregate in the stone sawn mud road backfill material, wherein the unit is kg;
(3) backfilling material according to stone mud sawing roadDetermining the ratio of lime to sand, and drawing up the cement consumption Q in the backfill material of the stone sawn mud roadcIn units of Kg/m3；
(4) Determining the doping amount C of the stone sawing mud according to a maximum stacking density method, wherein the unit is kg;
(5) determining the water-solid ratio according to the workability requirement of the backfill material of the stone sawn mud road, and calculating the water consumption W of the backfill material, wherein the unit is kg/m3；
(6) And trial mixing of the backfill material is carried out, and the workability and the strength of the backfill material are tested.
(7) And selecting the mixing proportion which meets the test requirements in work workability and strength as the final mixing proportion of the backfill material.
S6, converting the construction mixing ratio according to the mixing ratio of the laboratory:
(1) calculating the actual fine aggregate dosage: m1＝Mⅹ(1+a)；
(2) Calculating the actual stone sawing mud dosage: c1＝Cⅹ(1+b)；
(3) Calculating the actual water consumption: w1＝W-(M1-M)-(C1-C)
(4) Calculating the dosage of cement;
wherein: m1The actual amount of fines in kg/m3；
M-the amount of fine materials in the mixing ratio, the unit is kg/M3；
C1The actual amount of stone sawing mud is kg/m3；
C-the dosage of the stone sawing mud in the mixing proportion is kg/m3；
a, actually measuring the water content percent of the fine materials;
b, actually measuring the water content percent of the stone sawing mud;
W1the actual water consumption is in kg/m3；
W-the amount of water in the mixing ratio, in kg/m3。
And S7, pouring the weighed fine materials, cement and stone sawing mud into a stirring pot in sequence, and dry-mixing for 30S.
S8, adding 80% of water, and stirring for about 1min to ensure that the mixture is fully contacted with the water.
And S9, adding the rest water into the mixture, and stirring for 3-5 minutes again to obtain the road backfill material produced by the stone saw mud.
The construction method of the road backfill material produced by using the stone saw mud provided by the invention comprises the following steps:
the first step is as follows: and selecting a construction part. Different construction parts are suitable for different fluidity, and the working workability evaluation standard of the self-compacting backfill material produced by using the stone saw mud is shown in the attached table 2.
The second step is that: preparing the road backfill material produced by using the stone saw mud. The proper fluidity is determined according to specific construction parts, the dosage is calculated according to the construction mix proportion, and the preparation is carried out nearby a construction site, so that the construction can be finished within half an hour.
The third step: pouring and maintaining. Cleaning the pipe trench or any narrow part needing to be refilled. Pumping or pouring the mixed stone saw mud backfill material into a preparation position, and then covering a straw felt for maintenance for more than 24 hours. No rolling is required during curing.
Compared with the existing backfill material, the invention has the following beneficial effects:
1. is economical and environment-friendly. The stone sawing mud is solid waste which is difficult to treat and has great influence on the environment, and the regeneration rate is low. The method provided by the invention can be used for using a large amount of stone sawing mud, and opens up a new way for recycling the stone sawing mud.
2. The performance is good. The stone saw mud has the functions of improving the fluidity of backfill materials and reducing the bleeding rate of mixed materials due to the formation mechanism of the stone saw mud, can be combined with various fine materials for use, and ensures better tensile strength and compressive strength.
3. Simple construction and wide application range. The application effect of the stone saw mud in the flowing backfill material is equal to or even higher than that of the fly ash, and the stone saw mud can be used for replacing the fly ash in the backfill material. The stone sawing mud has simple construction process, can be used for various backfill projects, and has wider application range. The method is suitable for the structural backfilling of various municipal public pipe ditches and the backfilling of three backs of bridge abutment, culvert abutment and retaining wall in highway engineering.
The workability of the self-compacting backfill material produced by using the stone saw mud applied to different engineering types can meet the requirements of the table 2.
TABLE 2 evaluation criteria for workability of self-compacting backfill materials produced with stone saw mud
Workability of work Fluidity/mm Application scope
Low workability 100＜，≤150 Backfilling engineering of pipe ditches, roadbeds and the like in larger space
General workability 150＜，≤200 General backfill engineering
Good workability >200 Backfill engineering with narrow operation space or dead angle
The present invention will be further described with reference to the following embodiments.
Detailed Description
Example 1
The non-motor vehicle lane of a certain urban road is collapsed, and large compaction machinery cannot be used for compaction due to narrow space. The concrete implementation mode of the road backfill material produced by using the stone saw mud provided by the invention is as follows:
construction materials: the cement is ZUAN brand PC42.5R composite portland cement; the backfilling fine material is machine-made sand, the stone sawing mud is taken from an open-air stacking yard, and the water content is 0.6%; the water is potable tap water.
The construction process comprises the following steps:
1. and cleaning the impurities such as the virtual slag, the garbage and the like around the drainage well.
2. And determining the construction mixing ratio. 146kg/m cement3219kg/m stone saw mud31462kg/m machine-made sand3328kg/m of water3。
3. Mixing on site. The backfill material for stone sawn mud road is mixed by a small concrete mixer, and the mixing amount is about 0.2m each time3And the stirring process conforms to the preparation flow of the road backfill material.
4. And pouring the mixed stone and saw mud mixture into the chute and flowing into the gap around the drainage well.
5. After pouring is finished, spraying a proper amount of water for curing when the surface layer is hardened (about 6h), and forbidding vehicles and pedestrians to pass through during curing. And (5) after curing is finished (about 1d), performing construction of procedures such as sealing and the like.
The construction effect is as follows: during construction, the fluidity of the material provided by the invention reaches 140mm, no segregation and no bleeding occur, the 1d strength reaches 0.44MPa, the 28-day strength reaches 2.8MPa, and the requirement on the strength of the backfill around the drainage well is met. After one year of construction, the road surface at the construction position is intact, and the phenomena of settlement, cracking, uneven settlement and the like do not occur.
Example 2
The periphery of a drainage well of a certain urban road is sunk, and because the space is narrow, a large-scale compaction machine cannot be used for compaction. The concrete implementation mode of the road backfill material produced by using the stone saw mud provided by the invention is as follows:
construction materials: the cement is ZUAN brand PC32.5R composite portland cement; the backfill fine material is a construction waste fine aggregate, and the water content is 0.06%; the stone sawing mud is taken from an open-air stacking yard, and the water content is 0.6%; the water is potable tap water.
The construction process comprises the following steps:
1. and cleaning the impurities such as the virtual slag, the garbage and the like around the drainage well.
2. And determining the construction mixing ratio. 145kg/m cement3290kg/m stone sawing mud31449kg/m of recycled building waste coarse material3527kg/m of water3。
3. Mixing on site. The backfill material for stone sawn mud road is mixed by a small concrete mixer, and the mixing amount is about 0.2m each time3And the stirring process conforms to the preparation flow of the road backfill material.
4. And pouring the mixed stone and saw mud mixture into the chute, and allowing the mixed stone and saw mud mixture to flow into gaps around the collapse area.
5. After pouring is finished, spraying a proper amount of water for curing when the surface layer is hardened (about 6h), and forbidding vehicles and pedestrians to pass through during curing. And (5) after curing is finished (about 1d), performing construction of procedures such as sealing and the like.
The construction effect is as follows: in the construction process, the fluidity of the material provided by the invention reaches 190mm, the material is not isolated and has small bleeding, the 1d strength reaches 0.36MPa, the 28-day strength reaches 2.4MPa, and the backfill strength requirement is met. After one year of construction, the road surface at the construction position is intact, and the phenomena of settlement, cracking, uneven settlement and the like do not occur.
Embodiment 3
The concrete implementation mode of the road backfill material produced by using the stone saw mud provided by the invention is as follows:
construction materials: the cement is ZUAN brand PC42.5R composite portland cement; the backfill fine material is a construction waste fine material, and the water content is 0.5%; the stone sawing mud is taken from an open-air stacking yard, and the water content is 0.6%; the water is potable tap water.
The construction process comprises the following steps:
1. and cleaning the impurities such as the virtual slag, the garbage and the like around the bridge abutment back.
2. And determining the construction mixing ratio. 143kg/m cement3214kg/m stone saw mud3Machine-made sand 1425kg/m3374kg/m of water3。
3. Mixing on site. The backfill material for stone sawn mud road is mixed by a small concrete mixer, and the mixing amount is about 0.2m each time3And the stirring process conforms to the preparation flow of the road backfill material.
4. And pouring the mixed stone and saw mud mixture into the chute and flowing into the gap at the periphery of the table back.
5. After pouring is finished, spraying a proper amount of water for curing when the surface layer is hardened (about 6h), and forbidding vehicles and pedestrians to pass through during curing. And (5) after curing is finished (about 1d), performing construction of procedures such as sealing and the like.
The construction effect is as follows: in the construction process, the fluidity of the material provided by the invention reaches 190mm, the material is not isolated and has small bleeding, the 1d strength reaches 0.36MPa, the 28-day strength reaches 2.53MPa, and the requirement on the strength of the backfill around the abutment back is met. After one year of construction, the road surface at the construction position is intact, and the phenomena of settlement, cracking, uneven settlement and the like do not occur.

Claims (8)

1. Utilize self-compaction road backfill material of stone material saw mud production, its characterized in that: the backfill material is prepared by mixing stone sawn mud, cement, fine aggregate and water; the stone sawing mud has the characteristic of smooth surface, and meets the working workability of a self-compacting backfill material; the hardened compressive strength meets the construction requirements, the strength is between 0.34MPa and 0.45MPa in 1 day, the strength is between 1.0MPa and 1.8MPa in 7 days, and the strength is between 2.4MPa and 3.6MPa in 28 days;
the backfill material comprises the following components in percentage by weight, and the guidance range is shown in table 1:
TABLE 1 table of the components and dosage ranges of the self-compacting backfill material produced by using stone saw mud
Figure FDA0002729730550000011
Note: the fine aggregate is sand, and the mixing amount is the percentage of the fine aggregate.
2. The self-compacting road backfill material produced by using stone sawn mud as claimed in claim 1, characterized in that: the cement is PC42.5 composite Portland cement, and the cement dosage is reasonably selected according to the construction level and the design index.
3. The self-compacting road backfill material produced by using stone sawn mud as claimed in claim 1, characterized in that: the fine aggregate is machine-made sand.
4. The self-compacting road backfill material produced by using stone sawn mud as claimed in claim 1, characterized in that: the stone sawing mud is an industrial byproduct which is generated by stone processing and is piled in the open air after being subjected to environmental protection treatment; the stone saw mud has the particle size of 80 microns, and the particles are angular, smooth in surface and have the same appearance characteristics as the broken stone particles.
5. The self-compacting road backfill material produced by using stone sawn mud as claimed in claim 1, characterized in that: the backfill materials are all dry in mass.
6. The self-compacting road backfill material produced by using stone sawn mud as claimed in claim 1, characterized in that: the water is drinkable tap water.
7. The self-compacting road backfill material produced by using stone saw mud as claimed in claim 1, characterized in that: the preparation method of the backfill material comprises the following steps,
s1, measuring the fluidity of the flowable backfill material: selecting a hollow cylinder rigid test mold with the diameter of 76 +/-3 mm and the height of 150 +/-3 mm, wiping water drops on the test mold by using a wet towel, placing the test mold on a glass plate, pouring a newly mixed mixture into the test mold, tapping the outer wall of the test mold, scraping the test mold along the upper edge of the test mold by using a scraper, quickly lifting the test mold, measuring the maximum slump expansion diameter and the vertical slump expansion diameter of the test mold, and taking the average value of the maximum slump expansion diameter and the vertical slump expansion diameter as the fluidity of the mixture;
s2, measuring the bleeding rate of the backfill material: a volumetric cylinder with the volume of 1L is adopted for testing, and the bleeding rate is equal to the ratio of the accumulated total bleeding amount to the water content of the mixture in the volumetric cylinder;
s3, measuring the compression strength of the flowable backfill material: adopting a cube test mold with 70.7mm, injecting a flowable backfill material into the test mold, knocking the wall of the test mold, and fully filling the mixture; removing the mold after 24 hours, and then putting the sample into a standard curing room for curing; testing the compressive strength of the mixture at a standard age;
s4, determining the mixing ratio of the raw materials to the mixture:
after the raw materials are determined, the laboratory mix proportion design of the self-compacting backfill material produced by using the stone saw mud is carried out according to the following steps:
(1) determining the compressive strength F of the backfill material of the stone sawn mud roadcuThe unit is MPa and the unit of fluidity L is mm control index;
(2) drawing up the mass M of the fine aggregate in the stone sawn mud road backfill material, wherein the unit is kg;
(3) determining the ratio of lime to sand according to the strength requirement of the stone sawn-mud road backfill material, and drawing up the cement dosage Q in the stone sawn-mud road backfill materialcIn units of kg/m3；
(4) Determining the doping amount C of the stone sawing mud according to a maximum stacking density method, wherein the unit is kg;
(5) determining the water-solid ratio according to the workability requirement of the backfill material of the stone sawn mud road, and calculating the water consumption W of the backfill material, wherein the unit is kg/m3；
(6) Trial mixing of the backfill material is carried out, and the work workability and the strength of the backfill material are tested;
(7) selecting a mixing proportion with work workability and strength meeting the test requirements as a final mixing proportion of the backfill material;
s6, converting the construction mixing ratio according to the mixing ratio of the laboratory:
(1) calculating the actual fine aggregate dosage: m1＝M×(1+a)；
(2) Calculating the actual stone sawing mud dosage: c1＝C×(1+b)；
(3) Calculating the actual water consumption: w1＝W-(M1-M)-(C1-C)
(4) Calculating the dosage of cement;
wherein: m1The actual amount of fine aggregate is kg/m3；
M-the dosage of the fine aggregate in the mixing proportion, and the unit is kg/M3；
C1The actual amount of stone sawing mud is kg/m3；
C-the dosage of the stone sawing mud in the mixing proportion is kg/m3；
a, actually measuring the water content percent of the fine aggregate;
b, actually measuring the water content percent of the stone sawing mud;
W1the actual water consumption is in kg/m3；
W-the amount of water in the mixing ratio, in kg/m3；
S7, pouring the weighed fine aggregate, cement and stone sawing mud into a stirring pot in sequence, and dry-mixing for 30S;
s8, adding 80% of water, and stirring for 1min to ensure that the mixture is fully contacted with the water;
and S9, adding the rest water into the mixture, and stirring for 3-5 minutes again to obtain the road backfill material produced by the stone saw mud.
8. The construction method of the backfill material according to claim 1, characterized by: the construction method comprises the following steps of,
the first step is as follows: selecting a construction part; different construction parts are suitable for different fluidity, and the workability of the self-compacting backfill material produced by the stone saw mud is used as an evaluation standard;
the second step is that: preparing a road backfill material produced by using stone saw mud; determining proper fluidity according to specific construction parts, calculating the using amount according to the construction mixing proportion, and preparing nearby in a construction site to ensure that construction is finished within half an hour;
the third step: pouring and maintaining; cleaning a pipe ditch or any narrow part needing to be backfilled; pumping the mixed stone saw mud backfill material to a designated position, and then covering a grass felt for maintenance for more than 24 hours; no rolling is required during curing.
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