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Method for activating waste slag from stone washing in quarry, cement-based activated waste slag concrete, and preparation method of the concrete

A cement-based, concrete technology, which is applied in the preparation of the concrete, the activation of the waste slag made from stone washing in the quarry, and the field of cement-based activated waste slag concrete, which can solve the problems of increased water demand, decreased strength, and low activity of waste slag in concrete. , to achieve the effect of maximizing resource utilization, increasing compressive strength, and solving disposal difficulties

Active Publication Date: 2021-02-02
上海百奥恒新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mud produced during the flushing process is huge and difficult to dispose of. It is estimated that 4 tons of mud will be produced for every ton of gravel produced. The direct discharge of mud will cause pollution and damage to the local environment, and landfill will occupy land resources. Air pollution is caused by dust after dust, so how to effectively deal with these mud residues is an urgent problem to be solved
The traditional method dries the mud to obtain waste residue, which is directly added to cement concrete for resource disposal. Due to the low activity and irregular shape of the waste residue, the water demand of concrete will increase and the strength will drop sharply

Method used

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  • Method for activating waste slag from stone washing in quarry, cement-based activated waste slag concrete, and preparation method of the concrete
  • Method for activating waste slag from stone washing in quarry, cement-based activated waste slag concrete, and preparation method of the concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After the waste residue is dried in an oven at 100°C, it is dry-screened through a 32-micron screen, the undersize is stored and retained, and the oversize is further crushed and powdered for sieving; all sieved waste undersize is collected and placed in a Calcined at 900°C for 30 minutes in a high-temperature furnace, and after cooling to room temperature, grind the ashes in a ball mill;

[0026] Collect the activated waste slag after grinding to prepare cement-based activated waste slag concrete, using ordinary 42.5 cement. 192 parts of raw material, 128 parts of fine aggregate, and 1 part of high-efficiency polycarboxylate superplasticizer.

[0027] Put cement, activated waste slag, sand and aggregate into the mixer for mixing by weight. The mixing time for dry powder is 1.5min. After mixing evenly, add water and water reducer for 3min. After mixing evenly, transfer The mold was subjected to vibration molding, and the sample was cured in a standard curing box (20° C...

Embodiment 2

[0029] After the waste residue is dried in an oven at 80°C, it is dry-screened through a 20-micron sieve, the undersize is stored and retained, and the oversize is further crushed and powdered for sieving; all sieved waste undersize is collected and placed in a Calcined at 700°C for 90 minutes in a high-temperature furnace, and after cooling to room temperature, grind the ashes in a ball mill;

[0030] Collect the activated waste slag after grinding to prepare cement-based activated waste slag concrete, using ordinary 42.5 cement, and the components are calculated by weight: 75 parts of cement, 75 parts of activated waste slag, 40 parts of water, 185 parts of sand, coarse bone 142.5 parts of material, 142.5 parts of fine aggregate.

[0031] Add cement, activated waste slag, sand and aggregate to the mixer for mixing by weight. The mixing time for dry powder is 2 minutes. After mixing evenly, add water for mixing. The mixing time is 4 minutes. After mixing evenly, transfer to t...

Embodiment 3

[0033] After the waste residue is dried in an oven at 110°C, it is dry-sieved through a 75-micron sieve, the undersize is stored and retained, and the oversize is further crushed and powdered for sieving; all sieved waste undersize is collected and placed in a Calcined in a high-temperature furnace at 800°C for 60 minutes, and after cooling to room temperature, grind the ashes in a ball mill;

[0034] Collect the activated waste slag after grinding to prepare cement-based activated waste slag concrete, using ordinary 42.5 cement. 180 parts of raw material, 150 parts of fine aggregate, and 2 parts of high-efficiency polycarboxylate superplasticizer.

[0035] Put cement, activated waste slag, sand and aggregate into the mixer by weight and mix them. The mixing time for dry powder is 1min. After mixing evenly, add water and water reducer for 2min. After mixing evenly, transfer to The mold was subjected to vibration molding, and the sample was cured in a standard curing box (20°C...

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Abstract

The invention provides a method for activating waste slag from stone washing in quarries, cement-based activated waste slag concrete, and a preparation method for the concrete. The activation method includes the following steps: calcining the waste slag at 700-900°C to obtain ash body, and The ash body is ground to obtain activated waste residue. In the present invention, the quarry waste residue is calcined and activated at a high temperature of 700-900°C, which can maximize the activity of the quarry waste residue, and the compressive strength of the cement concrete obtained after partially replacing the cement is significantly increased, which not only solves the difficulty of waste residue disposal problems, maximize the utilization of resources, and effectively reduce the cost of cement concrete. It is speculated that the reason may be that the aluminosilicate in the waste slag removes hydroxyl groups under high temperature conditions, which changes its physical and chemical properties, and obtains highly active oxides containing silicon and aluminum, which have pozzolanic activity.

Description

technical field [0001] The invention relates to concrete and a preparation method thereof, in particular to a method for activating waste slag produced by washing stones in quarries. Further, it relates to a cement-based activated waste slag concrete, and correspondingly, it also relates to a preparation method of the concrete. Background technique [0002] Natural sand is the main constituent material of concrete and mortar widely used in civil engineering. It not only plays an important role in bearing the skeleton and improving the performance of the mixture, but also consumes a huge amount, accounting for about 25% of the total weight of concrete products and about 80% of the total weight of mortar. With the continuous development of social economy and industrial production, the market demand for stone is increasing. Sandstone is the most widely used stone by human beings. It mainly contains silicon, calcium, clay, etc. Sandstone is light pollution, no radiation, and no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B2201/50C04B18/023C04B14/06C04B14/02C04B2103/302
Inventor 张祖华
Owner 上海百奥恒新材料有限公司
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