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A modified glass tailings cement-based auxiliary cementitious material and its preparation method

A technology of cement-based materials and glass tailings, which is applied in the field of cement-based materials and glass tailings to prepare cement-based auxiliary cementitious materials. performance, overcoming low activity, and improving durability

Active Publication Date: 2016-01-20
WEST ANHUI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these inventions are methods for preparing cement-based auxiliary cementitious materials, neither of which involves glass tailings, and the ingredients of the alteration agent mentioned in the invention are relatively complicated; The material method is relatively simple, and there are certain difficulties in actual production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put the glass tailings in a ball mill and grind them mechanically for about 45 minutes until the particle size is 10wt% ± 2wt% after sieving through a square hole sieve with a particle size of 80 μm to obtain the modified glass tailings cement-based auxiliary cementitious material.

[0022] The stability of the cement slurry mixed with 30wt% modified glass tailings was tested according to GB175-2007 "General Portland Cement", and the stability result was qualified. Conduct related experiments on the strength and shrinkage deformation test of cement-based materials mixed with modified glass tailings. Strength test: adopt GB / T17671-1999 "Cement Mortar Strength Test Method (ISO Method)" standard; self-shrinkage test: device Plastic corrugated pipe with a mold size of φ25mm×300mm is used, tested with a dial indicator; drying shrinkage test: the device uses a 25mm×25mm×280mm triple test mold, with a stainless steel probe embedded in the end, and the test is performed with a r...

Embodiment 2

[0024] Take glass tailings and calcium carbide slag according to the mass percentage of 80:20, put them in a mixer, and carry out hydrothermal treatment after the dry materials are stirred. The surface modified glass tailings were obtained after the bulk material was dried. The stability of the cement slurry mixed with 30% modified glass tailings was tested according to GB175-2007 "General Portland Cement", and the stability result was qualified. Through the strength and shrinkage deformation test method described in Example 1, 30wt% unmodified glass tailings and modified hydrothermal treatment modified surface glass tailings were added instead of cement, and the obtained surface modified glass tailings composite cement Compared with the 28d compressive strength of unmodified glass tailings, the 28d strength of the slurry increased by 11.2%, and the autogenous shrinkage and drying shrinkage decreased by 5.9% and 11.3%, respectively.

Embodiment 3

[0026] According to the mass percentage of 90:10, take glass tailing sand and calcium carbide slag, put them in a mixer, stir the dry materials evenly, and then carry out low-temperature calcination treatment. The calcination temperature in the muffle furnace is 850 ° C, and the holding time is 1 hour. , The obtained surface modified glass tailings were quenched in air. The stability of the composite cement slurry mixed with 30wt% modified glass tailings was tested according to GB175-2007 "General Portland Cement", and the stability result was qualified. Through the strength and shrinkage deformation testing method described in Example 1, 30wt% of unmodified glass tailings and modified surface glass tailings treated with modified low-temperature calcination were added instead of cement, and the obtained surface modified glass tailings were composited. Compared with the 28d compressive strength of unmodified glass tailings, the 28d strength of the cement paste increased by 13.2...

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Abstract

The invention discloses a modified glass tailings cement based auxiliary gelling material and a preparation method thereof. The material comprises glass tailings and modified auxiliary in the weight ratio of 70-100:0-30 materials; the modified auxiliary is a calcareous material or calcium magnesium material or a mixture of the two in any mass ratio. All the materials are mixed and treated by one method selected from mechanical grinding, hydrothermal treatment, low temperature calcination and hydrothermal-calcination. The invention conducts surface modification on the glass tailings to improve the surface gelling property of the glass tailings, reduce the shrinkage deformation of the cement based material and improve the early mechanical properties. The invention makes full use of industrial wastes of glass tailings, calcium carbide slag and magnesite tailings to develop a novel cement based auxiliary gelling material, which can reduce the dosage of cement clinker, prolong the service life of cement based material, indirectly reduce the energy consumption for cement production, and reduce carbon dioxide emission. The invention has important meaning to energy saving, emission reduction and the sustainable development of cement concrete industry.

Description

technical field [0001] The invention belongs to the field of building materials and relates to cement-based materials, in particular to a method for preparing cement-based auxiliary gelling materials by using glass tailings. Background technique [0002] In 2013, China's cement output reached 2.41 billion tons, which is widely used in engineering construction such as industry, agriculture, national defense, urban construction, water conservancy and ocean development, which strongly supports the rapid development of my country's economy and society. However, the cement industry is my country's It is one of the industries with the largest consumption of energy resources, accounting for about 5% of the country's total energy consumption, and particulate matter emissions account for about 30% of the total industrial emissions, which further intensifies the pressure on my country's industrial energy, resources and environmental protection. The cement industry affected by high ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24
CPCY02P40/10
Inventor 郝成伟邓敏陈登钱红梅姜蕾
Owner WEST ANHUI UNIV
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