CN-121974605-A - Preparation method of mixture of low-carbon solid waste-based cementing material stable brick-concrete regenerated fine aggregate and mixture

CN121974605ACN 121974605 ACN121974605 ACN 121974605ACN-121974605-A

Abstract

The invention discloses a preparation method of a mixture of a low-carbon solid waste-based cementing material stabilized brick-concrete regenerated fine aggregate and the mixture, which comprises the steps of testing fineness, setting time, stability and sand strength of the low-carbon solid waste-based cementing material, and testing particle distribution, soil content, water content, light matter content and organic matter content in the brick-concrete regenerated fine aggregate; adding the low-carbon solid waste-based cementing material and the brick-concrete regenerated fine aggregate into a stirrer according to a proportion, stirring uniformly, adding water, stirring continuously until slurry wraps clay brick and tile particles, adding water for the first time to be 2/3~3/4 of the total water consumption, and dissolving the stabilizer into the residual water, and stirring continuously until the mixture is uniform. The invention uses the construction waste to replace natural sand and stone raw materials, solves the pressure required by road engineering on natural sand and stone materials, adopts low-carbon gelling materials produced by industrial solid waste to replace calcined traditional cement, reduces the carbon emission and further reduces the engineering cost.

Inventors

LI HONGBIN
YANG MINGJING
LIU YAXUAN
WANG CHAOYANG
WANG CHENGHAO
Niu Shuchang
XING JINGPU
YIN JIALE

Assignees

河北农业大学

Dates

Publication Date: 20260505
Application Date: 20260123

Claims (10)

1. The preparation method of the mixture of the low-carbon solid waste-based cementing material stable brick-concrete regenerated fine aggregate is characterized by comprising the following steps: S1, testing fineness, setting time, stability and mortar strength of a low-carbon solid waste-based cementing material, and testing particle distribution, soil content, water content, light matter content and organic matter content in a brick-concrete regenerated fine aggregate to ensure that indexes of the materials are in a specified range; S2, adding the low-carbon solid waste-based cementing material and the brick-concrete regenerated fine aggregate into a stirrer according to a proportion, and carrying out dry stirring uniformly, and adding water to continuously stir until slurry wraps clay brick and tile particles, wherein the primary water adding amount is 2/3~3/4 of the total water consumption; and S3, dissolving the stabilizer by using the residual water, and adding the dissolved stabilizer into a stirrer to continuously stir until the stabilizer is uniformly mixed.
2. The preparation method of the composite material, according to claim 1, is characterized in that the raw materials are 4-7 parts of low-carbon solid waste-based cementing material, 90-110 parts of brick-concrete regenerated fine aggregate and 15-19 parts of water, and the stabilizer is 0.2-0.6% of the solid material.
3. The preparation method according to claim 1, wherein in the step S1, the low-carbon solid waste-based cementing material is of GC42.5 grade, the fineness is not more than 12% of screen residue by a 45 μm square hole screen, the initial setting time is not less than 45min, the final setting time is not more than 600min, and the sand strength is that under the condition of 3d, the flexural strength is not less than 3MPa, the compressive strength is not less than 15MPa, and under the condition of 28d, the flexural strength is not less than 7.5MPa, and the compressive strength is not less than 42.5MPa.
4. The method according to claim 1, wherein in step S1, the low-carbon solid waste-based cementing material is tested for stability by a boiling method, a steaming method and a soaking method, and if the boiling method and the soaking method are qualified, the steaming method expansion rate is not more than 0.5%, the material is qualified, otherwise, the material is not qualified.
5. The method according to claim 1, wherein in step S1, the brick-concrete regenerated fine aggregate is subjected to a particle composition analysis by an analysis method test, wherein the light matter content is less than 1% and the organic matter content is less than 2%.
6. The preparation method of claim 1, wherein in the step S2, the dry mixing time is 1-2 min until the color of the mixture of the low-carbon solid waste-based cementing material and the brick-concrete regenerated fine aggregate is consistent.
7. The preparation method according to claim 1, wherein in step S2, stirring is performed for 1 to 2 minutes after adding water.
8. The preparation method according to claim 1, wherein in step S3, the stabilizer is added and stirred for 2 to 3 minutes.
9. The method of claim 1, wherein the stabilizer is an ionic liquid stabilizer.
10. A mixture of low carbon solid waste based binder stabilized brick-concrete recycled fine aggregate for town road base, characterized in that it is prepared by the preparation method of any one of claims 1-9.

Description

Preparation method of mixture of low-carbon solid waste-based cementing material stable brick-concrete regenerated fine aggregate and mixture Technical Field The invention relates to the technical field of road pavement base materials, in particular to a preparation method of a mixture of a low-carbon solid waste-based cementing material stable brick-concrete regenerated fine aggregate and the mixture. Background The treatment mode of the construction waste is mainly traditional landfill and open-air stacking, and the recycling utilization rate is long-term loitering at a low level. The building rubbish is huge, not only occupies a large amount of land, but also pollutes the environment, and becomes a heavy burden and potential safety hazard of urban ecological civilization. From 50 s of the last century to about 2010, industrial and civil buildings mainly adopt a brick-concrete structure, the local residence ratio of villages and towns is higher, and the wall materials mainly adopt sintered clay bricks. Therefore, the main components of the brick-concrete type construction waste are waste clay bricks and tiles, waste concrete blocks, waste mortar, ceramic and glass fragments, miscellaneous soil and a small amount of light substances, and the recycled coarse aggregate and the recycled fine aggregate can be processed by crushing and screening, wherein the fine aggregate is more than 50%. The regenerated aggregate of brick-concrete building rubbish is characterized by miscellaneous components, more impurities, large soil content, low strength, large water absorption and poor recycling quality. In the processing process, the brick-concrete construction waste with low strength and serious wind generation is easily broken into fragments, and a large amount of redundant fine powder is generated. Therefore, although the recycled fine aggregate with the grain size smaller than 4.75mm is called as brick-concrete, the proportion of the components with the grain size smaller than 0.30mm is generally 40% -60%, the content of fine particles and soil with the grain size smaller than 0.15mm is often more than 30%, and mortar, glass, ceramic tiles, wood and fragments of heat insulation materials are mixed. Because of the restriction of production cost, the construction waste disposal enterprises generally do not separate dregs from particles, so that the particle grading and the soil content of the brick-concrete regenerated fine aggregate do not meet the quality requirement of road engineering on recycled II-level regenerated aggregates, and the brick-concrete regenerated fine aggregate can only be reused for producing construction materials such as regenerated mortar, fluid filling materials, bricks, building blocks and the like, and the construction waste recycling utilization rate is seriously influenced because a large amount of consumed engineering application scenes are difficult to find. Because the engineering quantity of road engineering construction is large, the materials for road base layers are large, but the requirements on performances such as strength and the like are not high, the brick-concrete regenerated aggregate can be prepared into a mixture, and the mixture is widely applied to the road base layers and the subbase layers. At present, most of the existing research and invention patents utilize concrete regenerated broken stone and brick-mixed regenerated coarse aggregate to fully or partially replace natural broken stone to prepare water-stable mixture, but the research and application of the road use of the brick-mixed fine aggregate are few, the quality of the brick-mixed fine aggregate is generally considered to be poor, the road engineering requirement is hardly met, and the broken stone or broken brick coarse aggregate is also required to be mixed for use even if the brick-mixed fine aggregate is used. At present, the research on the road application of the regenerated aggregate of the construction waste mainly takes the regenerated aggregate to replace natural aggregate as a main research body, and the road performance of the inorganic mixture of the regenerated aggregate is researched by replacing the natural aggregate with different proportions. The existing research results show that the performance of the regenerated aggregate inorganic mixture can meet the regulation and application requirements of road application, so that the road application of the regenerated aggregate mixture is feasible. However, the existing researches and inventions are mostly aimed at the concrete type construction waste regenerated aggregates, and the application research of the concrete type construction waste regenerated aggregates is less after the waste concrete regenerated aggregates or the regenerated aggregates and the brick-concrete regenerated coarse aggregates are mixed in proportion to replace the natural aggregates to prepare the pavement base layer mixture. In particular to the application technical