A kind of preparation method of ecological concrete and its concrete products prepared by sintering micropowder of construction waste soil

A technology of ecological concrete and construction spoil, applied in the direction of manufacturing tools, auxiliary molding equipment, ceramic molding machines, etc., can solve the problem of not meeting the green and sustainable development concept of the construction industry, insufficient supply of auxiliary cementitious materials, and increasing supply gaps and other problems, to achieve the effect of speeding up resource disposal efficiency, optimizing spoil sintering mechanism and supporting grinding mechanism, and reducing cement usage

Active Publication Date: 2021-12-31
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Concrete materials and their products are widely used in the construction industry, and the main raw material for preparing concrete is cement, so the construction industry has a serious dependence on the cement industry, but the traditional cement industry has high energy consumption and high CO 2 emissions and other characteristics, which do not meet the green and sustainable development concept of the construction industry; at the same time, with the increasing demand for traditional auxiliary cementitious materials such as fly ash in the concrete industry, the supply of traditional auxiliary cementitious materials is slightly insufficient, and the supply gap will increase. increasing year by year

Method used

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  • A kind of preparation method of ecological concrete and its concrete products prepared by sintering micropowder of construction waste soil
  • A kind of preparation method of ecological concrete and its concrete products prepared by sintering micropowder of construction waste soil
  • A kind of preparation method of ecological concrete and its concrete products prepared by sintering micropowder of construction waste soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Spoil sintered micro-powder concrete specimen: Weigh the raw materials according to the concrete formula, and measure the first group of materials: 100 parts of cement, 50 parts of spoil sintered micro-powder (maximum particle size 0.15mm), 200 parts of natural sand, natural coarse aggregate 300 parts, Nano CaCO 3 1 part, 5 parts of sodium hydroxide activator, 2 parts of regenerated PET fiber (6mm), and slowly stir the first group of materials for 1 minute. Then measure the second group of materials, 50 parts of water, and 0.7 parts of polycarboxylate superplasticizer. Mix the second group of materials and add them to the first group of materials in 3 times. During this process, use rapid stirring for 2 minutes , obtain the spoil sintered micro-powder concrete mixture, and pour the obtained concrete mixture into shape, after 24 hours of forming, it is demoulded and placed in a standard curing room for curing for 28 days. The standard compressive strength of the spoil s...

Embodiment 2

[0095] Spoil sintered micro-powder concrete specimen: Weigh the raw materials according to the concrete formula, and measure the first group of materials: 100 parts of cement, 50 parts of spoil sintered micro-powder (maximum particle size 0.075mm), 200 parts of natural sand, natural coarse aggregate 300 parts, Nano CaCO 3 1 part, 5 parts of sodium hydroxide activator, 2 parts of regenerated PET fiber (6mm), and slowly stir the first group of materials for 1 minute. Then measure the second group of materials, 50 parts of water, 0.8 parts of polycarboxylate superplasticizer, mix the second group of materials and add them to the first group of materials in 3 times. During this process, use rapid stirring for 2 minutes , obtain the spoil sintered micro-powder concrete mixture, and pour the obtained concrete mixture into shape, after 24 hours of forming, it is demoulded and placed in a standard curing room for curing for 28 days. The measured standard compressive strength of the s...

Embodiment 3

[0097] Spoil sintered micro-powder concrete specimen: Weigh the raw materials according to the concrete formula, and measure the first group of materials: 100 parts of cement, 50 parts of spoil sintered micro-powder (maximum particle size 0.042mm), 200 parts of natural sand, natural coarse aggregate 300 parts, Nano CaCO 3 1 part, 5 parts of sodium hydroxide activator, 2 parts of regenerated PET fiber (6mm), and slowly stir the first group of materials for 1-2 minutes. Then measure the second group of materials, 50 parts of water, 1.0 parts of polycarboxylate superplasticizer, mix the second group of materials and add them to the first group of materials in 3 times. During this process, use rapid stirring for 2 minutes , obtain the spoil sintered micro-powder concrete mixture, and pour the obtained concrete mixture into shape, after 24 hours of forming, it is demoulded and placed in a standard curing room for curing for 28 days. The measured standard compressive strength of th...

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Abstract

The invention relates to a method for preparing ecological concrete and its concrete products prepared by utilizing building spoil sintered micropowder. The ecological concrete includes 100 parts of cement, 5-100 parts of sintered spoil micropowder, 200-1200 parts of natural sand, and natural coarse aggregate 200‑2000 parts, nano CaCO 3 0.1-5 parts, 0.01-10 parts of regenerated PET fiber, 0.01-20 parts of activator, 0.1-5 parts of water reducing agent, 30-150 parts of water; the preparation method is to first grind, sieve and mix the construction spoil with water , followed by aging, sintering and solidification, grinding, and then mixing with other components, and finally pouring molding, demoulding, and curing processes to obtain concrete products. Compared with the prior art, the present invention not only realizes high-efficiency and high-value-added resource utilization of construction spoils, but also reduces the demand for cement, fly ash and other cementitious materials, and is a green and sustainable building material.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and relates to a method for preparing ecological concrete and concrete products prepared by sintering micropowder of construction waste soil Background technique [0002] With the rapid development of my country's economy and the advancement of urbanization, a large amount of construction waste is generated in the process of new construction and demolition of buildings, and the discharge of construction waste is increasing year by year. The disposal of traditional construction waste is mainly based on stacking and landfilling. This extensive construction waste disposal method inevitably produces a series of environmental and social problems; recovery and reuse of chemical products. At present, the resource disposal technology of construction waste in my country is mainly to crush and sieve waste concrete and waste bricks in construction waste to prepare recycled aggregates an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/06B28B17/02
CPCC04B28/04C04B28/06B28B17/02C04B2201/50C04B2111/00017C04B14/06C04B14/02C04B14/28C04B22/062C04B18/16C04B16/0683
Inventor 肖建庄马志鸣段珍华郝潞岑
Owner TONGJI UNIV
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