CN111393065A - Construction solid waste regeneration composite roadbed filler and preparation method thereof - Google Patents
Construction solid waste regeneration composite roadbed filler and preparation method thereof Download PDFInfo
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- CN111393065A CN111393065A CN202010263108.5A CN202010263108A CN111393065A CN 111393065 A CN111393065 A CN 111393065A CN 202010263108 A CN202010263108 A CN 202010263108A CN 111393065 A CN111393065 A CN 111393065A
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- solid waste
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Abstract
The invention relates to a construction solid waste regeneration composite roadbed filler and a preparation method thereof, wherein the roadbed filler comprises, by mass, 5-70% of brick-concrete recycled aggregate, 5-75% of mud cake filler, 1-10% of hydrated lime, 1-10% of fly ash, 0.5-4% of HEC and 10-20% of water. The regenerated composite roadbed filling material for the building solid waste has high strength and small drying shrinkage, realizes the resource utilization of the building solid waste such as waste clay bricks, waste concrete, mud cakes and the like, solves the pollution problem of the building solid waste landfill disposal and the damage of natural filling material exploitation to the environment, and relieves the current situation of the shortage of natural resources.
Description
Technical Field
The invention relates to a construction solid waste regeneration composite roadbed filling material and a preparation method thereof, belonging to the technical field of roadbed filling.
Background
The urbanization process of China is in an acceleration stage, and a large amount of building solid waste is generated while urban transformation and infrastructure construction are rapidly developed, wherein the building solid waste mainly comprises concrete, clay bricks, building slurry and the like. The traditional treatment mode of building solid waste is mostly landfill or open-air stacking, not only can cause serious pollution to the environment in the process of transportation and dumping, but also can cause continuous influence to surrounding soil and water sources after landfill.
On the other hand, the demand of the road construction in the urban reconstruction process for high-quality natural fillers such as soil and stone is increasing continuously. The price of the natural filler is greatly increased, the phenomena of disorderly mining and random excavation are frequently forbidden, and environmental problems such as water loss, soil erosion, ecological damage and the like are frequent. Relevant laws and regulations are issued by governments at all levels to limit the mountain mining and soil taking, requirements are put on the modification and utilization of low-quality fillers and the recycling of wastes, and the current situation of natural resource shortage is preferably relieved.
Patent CN106012736A discloses a preparation method of crushed stone-doped laterite granules, which is characterized in that natural laterite granules with poor gradation are improved by doping crushed stones in a specific proportion, so as to obtain roadbed filler with high bearing capacity; patent CN106638196A improves natural expansive soil through polyaluminium chloride or hydrated lime, and the expansibility of the expansive soil is obviously improved and stable; patent CN102162241A discloses a method for improving expansive soil roadbed filler by using waste carbide slag, which takes carbide slag as curing agent to improve expansive soil. The method improves the low-quality filler, so that the current situation of resource shortage is relieved to a certain extent. However, the filler is mainly natural filler, and the problems of damage to the ecological environment caused by natural filler exploitation and disposal of solid waste of the building cannot be solved; and the filler has long transportation distance and high cost due to the road construction engineering of urban transformation.
The construction solid waste regeneration composite roadbed filler is prepared by using the brick-concrete recycled aggregate, the mud cake filler, the hydrated lime, the fly ash, the HEC and water, so that the problem of damage to the ecological environment caused by construction solid waste landfill treatment and natural filler exploitation is effectively solved, and the current situation of resource shortage of natural fillers is relieved; meanwhile, the brick-concrete recycled aggregate and the mud cake filler are processed from the building solid wastes generated in the urban reconstruction process, so that the brick-concrete recycled aggregate and the mud cake filler are shorter in transportation distance when being applied to urban road engineering, and the pressure and the construction cost brought to the urban traffic environment in the transportation process are favorably reduced.
Disclosure of Invention
The technical problem is as follows: the invention aims to solve the technical problem of providing a construction solid waste regeneration composite roadbed filler, which is prepared by solidifying brick-concrete regeneration aggregate and mud cake filler by using hydrated lime, fly ash and HEC (high-strength concrete admixture), and solves the problems of land occupation and environment pollution caused by the landfill treatment of the brick-concrete regeneration aggregate and the mud cake, and the problem of shortage of natural filler.
The technical scheme is as follows: in order to achieve the aim, the building solid waste regeneration composite roadbed filling material comprises the following raw materials in percentage by mass:
the brick-concrete recycled aggregate is obtained by crushing building solid wastes which are generated in the processes of construction, removal and the like and take clay bricks and concrete as main components; the maximum particle size is not more than 37.5mm, the mass ratio of particles with the particle size of more than 4.75mm is 40-60%, the mass ratio of particles with the particle size of less than 0.075mm is less than 5%, and the non-uniformity coefficient is more than 10; the content of clay bricks in the brick-concrete recycled aggregate is more than 80%, and the content of impurities in bamboo, wood, plastics and heat-insulating materials is not more than 1%.
The mud cake filler is obtained by dewatering, consolidating and crushing building mud; the maximum particle size is not more than 19.0mm, the mass proportion of particles with the particle size of more than 4.75mm is 45-65%, the mass proportion of particles with the particle size of less than 0.075mm is less than 5%, and the non-uniformity coefficient is more than 10; the liquid limit is not more than 45%, the plasticity index is 10-20, and the organic matter content is not more than 5%.
The hydrated lime, the fly ash and the high-Strength high-water-resistance soil consolidation agent HEC (high Strength and Waterstability Earth consolidator) are used as consolidation materials.
The HEC is a high-strength waterproof consolidation agent, has the characteristics of high early strength and stable development of later strength, and the addition amount is lower than that of cement without reducing the consolidation strength.
The slaked lime should meet the requirements of II-grade and above-grade lime in CJJ 1-2008 & Regulation of urban road engineering construction and quality acceptance, and the particle size of the slaked lime is not more than 4.75 mm.
In the fly ash, SiO2、Al2O3And Fe2O3The total amount is preferably more than 70 percent, and the burning vector at 700 ℃ is preferably not more than 10 percent; the fineness of the powder can meet the requirement that 90% of the powder passes through a 0.3mm sieve pore and 70% of the powder passes through a 0.075mm sieve pore, and the specific surface area is preferably more than 2500cm2/g。
The preparation method of the building solid waste regeneration composite roadbed filler comprises the following steps:
the method comprises the following steps: preparing building solid waste which takes clay bricks and concrete as main components into aggregate through crushing and screening, and uniformly stirring brick-concrete recycled aggregate, crushed mud cake filler, hydrated lime, fly ash and HEC according to mass percentage;
step two: determining the maximum dry density and the optimal water content of the mixture in the first step according to a heavy compaction test in standard JTG E40-2007 Highway soil engineering test regulations;
step three: carrying out a bearing ratio test on the mixture in the step one according to a standard JTG E40-2007 road soil engineering test regulation, wherein the bearing ratio of the mixture meets the requirement of a standard CJJ 194-2013 urban road subgrade design specification on the minimum strength of the subgrade filler, and the mixture can be used as the municipal road subgrade filler;
step four: testing the 7d unconfined compressive strength of the mixture in the first step according to a standard JTG E51-2009 test procedure for inorganic binder stabilizing materials for highway engineering, wherein the 7d unconfined compressive strength of the mixture meets the requirements of a standard CJJ169-2012 design Specification for urban road pavement for the subbase filler, and can be used as the municipal road subbase filler;
step five: uniformly mixing the mixture obtained in the step one according to the optimal water content determined in the step two, wherein the water content after mixing is Womc-1% -Womc + 0.5%, and Womc is the optimal water content;
step six: spreading and leveling the construction solid waste regeneration composite roadbed filler of the fifth step on the full section by adopting an occupancy method, rolling from two sides of the roadbed to the middle, longitudinally parallel to each other once to the end, overlapping 40-50 cm between transverse rows, and compacting the thickness not more than 0.3 m;
step seven: and after the filling of the building solid waste regeneration composite roadbed filler is finished, carrying out construction quality detection, wherein the detection contents comprise appearance, geometric dimension, flatness, compactness, deflection, bearing capacity and post-construction settlement deformation.
Has the advantages that: compared with the prior art, the composite roadbed filler prepared by the invention has the technical advantages that:
1. the clay brick is sintered at high temperature, so that the clay brick has certain volcanic ash activity, the construction solid waste regeneration composite roadbed filling material takes hydrated lime as one of consolidation materials, and the volcanic ash reaction between the hydrated lime and the clay brick is utilized to improve the strength of the construction solid waste regeneration composite roadbed filling material.
2. In the process of producing the mud cakes by dehydrating the building mud, a flocculating agent and a solidifying agent are required to be added, and the solidifying agent in the mud cake filler continuously plays a solidifying role in the building solid waste regeneration composite roadbed filler so as to improve the pavement performance of the roadbed filler.
3. When the brick-concrete recycled aggregate and the mud cake filler are applied, the proportion of the brick-concrete recycled aggregate and the mud cake filler in the building solid waste recycled composite roadbed filler can be reasonably adjusted on the premise of meeting the performance index requirement, and the complete utilization of the brick-concrete recycled aggregate and the mud cake filler is realized.
4. The solidifying agent of the construction solid waste regeneration composite roadbed filler is hydrated lime, fly ash and HEC, the addition amount of the hydrated lime, the fly ash and the HEC can be reasonably adjusted according to the performance requirement of the practical application environment on the construction solid waste regeneration composite roadbed filler, and the cost can be reasonably controlled while the performance of the construction solid waste regeneration composite roadbed filler is ensured to meet the requirement.
5. The brick-concrete recycled aggregate and the mud cake filler are used for preparing the building solid waste recycled composite roadbed filler and are applied to municipal road engineering on site, so that the problem of damage of building solid waste landfill treatment and natural filler mining to the ecological environment is effectively solved, the current situation of natural filler resource shortage is relieved, and the pressure and the construction cost brought to the urban traffic environment in the transportation process are reduced.
Detailed Description
Example 1:
the construction solid waste regeneration composite roadbed filling material comprises the following materials in percentage by mass: 66.2 percent of brick-concrete recycled aggregate, 7.4 percent of mud cake filler, 1.8 percent of grade II calcium hydrated lime, 8.8 percent of grade II fly ash, 3.5 percent of HEC and 12.3 percent of water; the mass percentage of water is determined by the heavy duty compaction test according to standard JTG E40-2007 highway geotechnical test code, the same applies below.
Example 2:
the construction solid waste regeneration composite roadbed filling material comprises the following materials in percentage by mass: 22.0 percent of brick-concrete recycled aggregate, 51.4 percent of mud cake filler, 4.3 percent of II-grade calcium hydrated lime, 8.1 percent of second-grade fly ash, 0.5 percent of HEC and 13.7 percent of water.
Example 3:
the construction solid waste regeneration composite roadbed filling material comprises the following materials in percentage by mass: 7.8 percent of brick-concrete recycled aggregate, 70.3 percent of mud cake filler, 1 percent of grade II calcium hydrated lime, 4.2 percent of grade II fly ash, 2.6 percent of HEC and 14.1 percent of water.
Example 4:
the construction solid waste regeneration composite roadbed filling material comprises the following materials in percentage by mass: 51.8% of brick-concrete recycled aggregate, 22.2% of mud cake filler, 4.4% of grade II calcium hydrated lime, 8.2% of grade II fly ash, 0.5% of HEC and 12.9% of water.
Comparative example 1: the common lime stable soil roadbed filler comprises the following materials in percentage by mass: clay 80.0%, level II calcium hydrated lime 5.1% and water 14.9%.
Comparative example 2: the common lime fly ash stabilized soil roadbed filler comprises the following materials in percentage by mass: 58.9 percent of clay, 8.4 percent of II-grade calcium hydrated lime, 16.8 percent of second-grade fly ash and 15.9 percent of water.
Comparative example 3: the common cement stabilized macadam subbase filler comprises the following materials in percentage by mass: 90.1 percent of graded broken stone, 3.8 percent of P.O 42.5 cement and 6.1 percent of water.
And (3) performance detection:
the roadbed fillers of the above examples and comparative examples were tested for maximum dry density, load bearing ratio (CBR), 7d unconfined compressive strength, and drying shrinkage according to the standard JTG E40-2007 specification for road geotechnical test and JTG E51-2009 specification for road engineering inorganic binder stabilizing material test, with the test results as given in table 1.
TABLE 1 test results
According to the invention, hydrated lime is used as one of consolidation materials, and the strength of the composite roadbed filling is improved by utilizing the volcanic ash reaction between the sintered clay bricks and the hydrated lime. In the preparation process of the building solid waste regenerated composite roadbed filling, the cost is reasonably controlled while the regenerated composite roadbed filling with the performance meeting the design requirement is obtained by reasonably selecting the mass percentages of the hydrated lime, the fly ash and the HEC. The brick-concrete recycled aggregate and the mud cake filler are processed from the building solid wastes generated in the urban reconstruction process, and when the building solid wastes recycled composite roadbed filler is applied, the proportion of the brick-concrete recycled aggregate and the mud cake filler in the building solid wastes recycled composite roadbed filler can be reasonably adjusted according to the requirements of relevant standards, so that the brick-concrete recycled aggregate and the mud cake filler are completely utilized. The development and application of the construction solid waste regenerated composite roadbed filling material have important significance for solving the influence of Chinese solid waste stacking and landfill disposal on the environment, reducing the damage of natural material exploitation on the ecological environment and relieving the current situation of Chinese resource shortage.
The technical means disclosed in the scheme of the invention are not limited to the technical means disclosed in the above embodiments, but also include the technical means formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (8)
1. The construction solid waste regeneration composite roadbed filler is characterized by comprising the following raw materials in percentage by mass:
2. the construction solid waste recycling composite roadbed filling material of claim 1, characterized in that the brick-concrete recycled aggregate is obtained by crushing construction solid waste which is generated in the construction and removal processes and takes clay bricks and concrete as main components; the maximum particle size is not more than 37.5mm, the mass ratio of particles with the particle size of more than 4.75mm is 40-60%, the mass ratio of particles with the particle size of less than 0.075mm is less than 5%, and the non-uniformity coefficient is more than 10; the content of clay bricks in the brick-concrete recycled aggregate is more than 80%, and the content of impurities in bamboo, wood, plastics and heat-insulating materials is not more than 1%.
3. The building solid waste recycling composite roadbed filling material of claim 1, wherein the mud cake filling material is obtained by dewatering, consolidating and crushing building mud; the maximum particle size is not more than 19.0mm, the mass proportion of particles with the particle size of more than 4.75mm is 45-65%, the mass proportion of particles with the particle size of less than 0.075mm is less than 5%, and the non-uniformity coefficient is more than 10; the liquid limit is not more than 45%, the plasticity index is 10-20, and the organic matter content is not more than 5%.
4. The construction solid waste recycling composite roadbed filler according to claim 1, wherein the hydrated lime, the fly ash and the HEC are consolidation materials.
5. The building solid waste recycling composite roadbed filling of claim 4, wherein the HEC is a high-strength waterproof consolidating agent, has the characteristics of high early strength and stable development of later strength, and the addition amount is lower than the cement addition amount without reducing the consolidation strength.
6. The construction solid waste recycling composite roadbed filler according to claim 4, wherein the hydrated lime meets the requirements of level II and above lime in CJJ 1-2008 & Specification for construction and quality acceptance of urban road engineering, and the particle size of the hydrated lime is not more than 4.75 mm.
7. The building solid waste recycling composite roadbed filler according to claim 4, wherein in the fly ash, SiO is contained2、Al2O3And Fe2O3The total amount is preferably more than 70 percent, and the burning vector at 700 ℃ is preferably not more than 10 percent; the fineness of the powder can meet the requirement that 90 percent of the powder passes through a sieve pore of 0.3mm and 70 percent of the powder passes through 0.075mm sieve pores, the specific surface area is preferably more than 2500cm2/g。
8. The preparation method of the construction solid waste recycling composite roadbed filling material according to claim 1, characterized by comprising the following steps:
the method comprises the following steps: preparing building solid waste which takes clay bricks and concrete as main components into aggregate through crushing and screening, and uniformly stirring brick-concrete recycled aggregate, crushed mud cake filler, hydrated lime, fly ash and HEC according to mass percentage;
step two: determining the maximum dry density and the optimal water content of the mixture in the first step according to a heavy compaction test in standard JTG E40-2007 Highway soil engineering test regulations;
step three: carrying out a bearing ratio test on the mixture in the step one according to a standard JTG E40-2007 road soil engineering test regulation, wherein the bearing ratio of the mixture meets the requirement of a standard CJJ 194-2013 urban road subgrade design specification on the minimum strength of the subgrade filler, and the mixture can be used as the municipal road subgrade filler;
step four: testing the 7d unconfined compressive strength of the mixture in the first step according to a standard JTG E51-2009 test procedure for inorganic binder stabilizing materials for highway engineering, wherein the 7d unconfined compressive strength of the mixture meets the requirements of a standard CJJ169-2012 specification for urban road pavement design on the subbase filler, and can be used as the municipal road subbase filler;
step five: uniformly mixing the mixture obtained in the step one according to the optimal water content determined in the step two, wherein the water content after mixing is Womc-1% -Womc + 0.5%; womc is the optimal water content;
step six: spreading and leveling the construction solid waste regeneration composite roadbed filler of the fifth step on the full section by adopting an occupancy method, rolling from two sides of the roadbed to the middle, longitudinally parallel to each other once to the end, overlapping 40-50 cm between transverse rows, and compacting the thickness not more than 0.3 m;
step seven: and after the filling of the building solid waste regeneration composite roadbed filler is finished, carrying out construction quality detection, wherein the detection contents comprise appearance, geometric dimension, flatness, compactness, deflection, bearing capacity and post-construction settlement deformation.
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