C30 regenerated aggregate concrete and preparation method thereof

A recycled aggregate and concrete technology, applied in the field of building materials, can solve problems such as poor workability, large concrete slump loss, and large porosity, and achieve the effects of reducing interaction force, promoting environmental protection, and improving activity

Inactive Publication Date: 2020-03-31
青岛汇鑫混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A large amount of iron tailings are mixed into the existing concrete, because the water absorption rate of iron tailings is relatively high, the surface is rough, and the porosity is large, so when the amount is large, the iron tailings are easy to absorb more water in the concrete. Free water causes greater slump loss of concrete, poor workability, easy dispersion, and low strength
[0006] When the concrete mixing station pro

Method used

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  • C30 regenerated aggregate concrete and preparation method thereof
  • C30 regenerated aggregate concrete and preparation method thereof
  • C30 regenerated aggregate concrete and preparation method thereof

Examples

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Effect test

preparation example 1

[0044] Preparation Example 1: (1) Dry the iron tailings and red mud at 100°C for 2.5 hours. The composition analysis of the iron tailings and red mud is shown in Table 1; Add sodium silicate and diatomaceous earth to tailings sand and red mud, wet grind at 67% concentration for 20 minutes, dry at 100°C after wet grinding, then calcinate at 600°C for 2 hours, dry grind for 10 minutes, and pass through 200 mesh Sieve to obtain activated iron tailings, the mass ratio of iron tailings sand to red mud is 2:0.9, and the mass ratio of iron tailings sand to sodium silicate and diatomite is 1:0.3:0.5.

[0045] The main chemical composition of iron tailings sand and red mud in table 1 preparation example 1-3

[0046] Element Fe 2 o 3

preparation example 2

[0047] Preparation Example 2: (1) Dry the iron tailings and red mud at 105°C for 2.3 hours. The composition analysis of the iron tailings and red mud is shown in Table 1; Add sodium silicate and diatomaceous earth to tailings sand and red mud, wet grind at 68% concentration for 15 minutes, dry at 110°C after wet grinding, then calcinate at 650°C for 1.5h, dry grind for 15 minutes, pass 200 mesh sieve to obtain activated iron tailings, the mass ratio of iron tailings sand to red mud is 2:1, and the mass ratio of iron tailings sand to sodium silicate and diatomite is 1:0.4:0.6.

preparation example 3

[0048] Preparation Example 3: (1) Dry the iron tailings and red mud at 110°C for 2 hours, and the composition analysis of the iron tailings and red mud is shown in Table 1; (2) add the iron tailings prepared in step (1) Add sodium silicate and diatomite to the ore sand and red mud, wet grind at 70% concentration for 10 minutes, dry at 120°C after wet grinding, then calcinate at 700°C for 1 hour, dry grind for 20 minutes, and pass through a 200-mesh sieve , to prepare activated iron tailings, the mass ratio of iron tailings sand to red mud is 2:1.1, and the mass ratio of iron tailings sand to sodium silicate and diatomite is 1:0.5:0.8.

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Abstract

The invention discloses a C30 regenerated aggregate concrete and a preparation method thereof. The C30 regenerated aggregate concrete includes the following components: cement, mineral powder, fly ash, sand, cobble, water, an additive, and regenerated aggregate comprising activated iron tailing and waste slurry by the mass ratio of 1:0.3-0.6. The activated iron tailing is prepared through steps of: 1) drying iron tailing sand and red mud at 100-110 DEG C for 2-2.5 h; 2) adding sodium silicate and diatomite to the iron tailing sand and red mud, wet-milling the mixture for 10-20 min, drying themixture, calcining the mixture at 600-700 DEG C for 1-2 h, dry-milling the mixture for 10-15 min, and screening the mixture through a 200-mesh sieve to prepare the activated iron tailing. The C30 regenerated aggregate concrete is high in compressive strength, can reduce environmental pollution of the iron tailing and concrete waste slurry, saves resources and protects environment.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a C30 recycled aggregate concrete and a preparation method thereof. Background technique [0002] Concrete is one of the most important civil engineering materials in the contemporary era. It has the characteristics of abundant raw materials, low price, and simple production process, so its consumption is increasing. At the same time, concrete also has high compressive strength, good durability, and a range of strength grades. Therefore, concrete is also an important material in the fields of shipbuilding, machinery industry, marine development, and geothermal engineering. [0003] Tailings are the waste after beneficiation and the main component of industrial solid waste. A large amount of tailings sand not only occupies land, but also produces dust that will pollute the environment. At present, the comprehensive utilization rate of tailings in my country is only 7%. ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/04C04B18/02C04B24/26C04B18/16C04B111/20
CPCC04B18/021C04B20/04C04B28/04C04B40/0039C04B2111/20C04B2111/2015C04B2201/50C04B18/12C04B18/0409C04B14/08C04B24/122C04B24/126C04B24/2652C04B2103/302C04B18/16C04B18/08C04B14/06C04B14/02C04B22/0046Y02W30/91
Inventor 任军卫陈永杰牛光杰赵明廷任君峰
Owner 青岛汇鑫混凝土有限公司
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