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A kind of preparation method of tuff cementitious material

A technology of cementing materials and tuff, which is applied in the field of preparation of cementing materials, can solve problems such as the decline in mechanical properties of gelled and solidified specimens, high content of glass debris and crystal debris, and disturbance of expected construction effects, so as to shorten the curing cycle , High compressive strength, strong frost resistance

Active Publication Date: 2021-11-26
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are certain differences in the physical and chemical properties of mineral admixtures from different mineral origins, which will disturb the expected construction effect and lead to a decline in the mechanical properties of the gelled and cured specimens
[0003] Tuff is rich in mineral resources and low in price. It is a pozzolanic material with certain potential gelling properties and can replace cement as a cementitious material for concrete. However, the high content of glass debris and crystal debris in tuff will hinder its release of gelling activity

Method used

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  • A kind of preparation method of tuff cementitious material
  • A kind of preparation method of tuff cementitious material
  • A kind of preparation method of tuff cementitious material

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Experimental program
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Effect test

Embodiment 1

[0021] Effect of mass ratio of sodium hydroxide to tuff powder on activity of tuff cementitious material

[0022] Such as figure 1 Shown is the preparation process of tuff cementitious material.

[0023] Preparation of the tuff cementitious material: weighing a certain amount of tuff, crushing, grinding, and passing through a 100-mesh sieve to obtain tuff powder. Quantitative calcium carbide slag was weighed, crushed, ground, and passed through a 100-mesh sieve to obtain calcium carbide slag powder. According to the mass ratio of sodium hydroxide to tuff powder, it is 0.035:1, 0.04:1, 0.045:1, 0.05:1, 0.075:1, 0.1:1, 0.125:1, 0.15:1, 0.155:1, 0.16:1, Weigh the sodium hydroxide powder at 0.165:1 respectively, and weigh the carbide slag powder according to the mass ratio of carbide slag powder and tuff powder at 0.5:1. Mix the weighed tuff powder, sodium hydroxide powder, and carbide slag powder evenly, and activate at 400°C for 4 hours to obtain the alkali-activated tuff mix...

Embodiment 2

[0031] Effect of mass ratio of carbide slag powder to tuff powder on the activity of tuff cementitious material

[0032] Preparation of tuff cementitious material: weighing quantitative tuff, crushing, grinding, and passing through a 200-mesh sieve to obtain tuff powder. Quantitative calcium carbide slag was weighed, crushed, ground, and passed through a 200-mesh sieve to obtain calcium carbide slag powder. Sodium hydroxide powder is weighed according to the mass ratio of sodium hydroxide and tuff powder 0.1:1, and the mass ratio of carbide slag powder and tuff powder is 0.35:1, 0.4:1, 0.45:1, 0.5:1, 0.75:1, 1.0: 1. 1.25:1, 1.5:1, 1.55:1, 1.6:1, 1.65:1, weigh carbide slag powder respectively. Mix the weighed tuff powder, sodium hydroxide powder, and carbide slag powder evenly, and activate at 500°C for 3 hours to obtain the alkali-activated tuff mixed powder. The alkali-activated tuff mixed powder, phosphogypsum powder, and diatomaceous earth were weighed and mixed according...

Embodiment 3

[0038] Effect of alkali-activated tuff mixed powder, phosphogypsum powder and diatomite mass ratio on activity of tuff cementitious material

[0039] Preparation of tuff cementitious material: weighing quantitative tuff, crushing, grinding, and passing through a 300-mesh sieve to obtain tuff powder. Quantitative calcium carbide slag was weighed, crushed, ground, and passed through a 300-mesh sieve to obtain calcium carbide slag powder. Weigh the sodium hydroxide powder according to the mass ratio of sodium hydroxide and tuff powder of 0.1:1, and weigh the carbide slag powder according to the mass ratio of carbide slag powder and tuff powder of 1.0:1. Mix the weighed tuff powder, sodium hydroxide powder, and carbide slag powder evenly, and activate at 600°C for 2 hours to obtain the alkali-activated tuff mixed powder. The alkali-activated tuff mixed powder, phosphogypsum powder, and diatomaceous earth are respectively according to the mass ratio of 1:0.07:0.07, 1:0.08:0.08, 1:...

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Abstract

The invention discloses a preparation method of a tuff cementitious material, which comprises the following steps: (1) pulverizing, grinding and sieving the tuff to obtain tuff powder; pulverizing, grinding and sieving the carbide slag to obtain the carbide slag powder; Tuff powder, calcium carbide slag powder and sodium hydroxide powder are mixed and then activated at high temperature to obtain alkali-activated tuff mixed powder; (2) Alkali-activated tuff mixed powder, phosphogypsum powder and diatomaceous earth are mixed and ball milled to obtain tuff gelled Material. The preparation method of the present invention is simple, the raw materials used are cheap, and the preparation cost is low; compared with the cement cementitious material, the tuff cementitious material of the present invention not only effectively shortens the curing period of the solidified body test piece, but also shows obvious quick-setting characteristics , and the prepared solidified body specimen has high compressive strength and strong frost resistance.

Description

technical field [0001] The invention relates to a preparation method of a cementitious material, in particular to a preparation method of a tuff cementitious material. Background technique [0002] With the vigorous development of large-scale infrastructure construction, the total number of buildings has increased year by year, and the requirements for the curing and gelling properties of materials and manufacturing processes have also gradually increased. Traditional cement concrete has long curing periods, late expansion of solidified bodies, and poor anti-thawing performance. Stability and other issues have gradually become unsuitable for infrastructure projects with high mechanical performance requirements. The national standard "Mineral Admixtures for High-Strength and High-Performance Concrete" (GB-T 18736-2017) introduces several mineral admixtures for concrete such as fly ash, finely ground slag, silica fume, natural zeolite, and metakaolin. To a certain extent, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B111/20
Inventor 黄涛宋东平周璐璐陶骏骏姚嘉杰
Owner CHANGSHU INSTITUTE OF TECHNOLOGY