Auxiliary cementing material as well as preparation method and application thereof

A gelling material and an auxiliary technology, applied in the field of preparation of the auxiliary gelling material, can solve the problems of unstable expansion in the later stage, difficult to control expansion rate and the like, and achieve simple processing and manufacturing process, easy control of expansion rate, and raw material resources easy-to-get effect

Active Publication Date: 2017-09-22
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the defects of the existing expansive cement and cement expansive agent, such as difficulty in controlling the expansion rate and unstable expansion in the later stage, an auxiliary cementitious material with excellent anti-shrinkage performance can be prepared by reasonably adjusting the calcination temperature and holding time

Method used

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  • Auxiliary cementing material as well as preparation method and application thereof
  • Auxiliary cementing material as well as preparation method and application thereof
  • Auxiliary cementing material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The dolomite used in the test was taken from Hexian County, Anhui Province, with a very low impurity content of 1.22%. The main components are shown in Table 1. The cement is P·II 52.5 Portland cement produced by Jiangnan Onoda Cement Co., Ltd., and its physical properties are shown in Table 2. The sand is river sand with a fineness modulus of 2.1.

[0027] Table 1

[0028] raw material

w(MgO)

w(CaO)

w(SiO 2 )

w(Al 2 o 3 )

w(Fe 2 o 3 )

Loss on ignition

sum

dolomites

21.01

30.39

0.21

0.61

0.39

46.17

98.78

[0029] Table 2

[0030]

[0031] Prepare the auxiliary cementitious material, that is, dolomite powder according to the following method: a) Mining dolomite, washing, drying and crushing; the crushed dolomite is screened through a 5mm sieve, and the remainder of the screen is continued to be crushed until all pass through 5mm sieve;

[0032] b) The crushed dolomite pellets are natur...

Embodiment 2

[0035] The calcination temperature is 800° C., the holding time is 2 hours, and the rest of the methods are the same as in Example 1.

Embodiment 3

[0037] The calcination temperature is 850° C., the holding time is 1 h, and the rest of the methods are the same as in Example 1.

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Abstract

The invention relates to an auxiliary cementing material as well as a preparation method and application thereof. The preparation method of the auxiliary cementing material comprises the following steps: (1) crushing dolomite; (2) piling the crushed dolomite, and performing calcining in calcining equipment, and keeping the temperature, wherein the calcining temperature is 800-900 DEG C, and the temperature keeping time is 1-2 hours; and (3) cooling a calcining product, and grinding into powder. The auxiliary cementing material can replace 10-30% of cement in an equal mass in mortar or concrete preparation. By adopting the auxiliary cementing material, the amount of cement is greatly reduced, and great economic effects are achieved.

Description

technical field [0001] The invention relates to an auxiliary gelling material, and also relates to a preparation method and application of the auxiliary gelling material. Background technique [0002] Nowadays, auxiliary cementitious materials are widely used in the field of cement concrete. Some are used as admixtures to prepare mixed Portland cement, and others are directly added to concrete as admixtures. The main purpose is to improve the performance of concrete and reduce the amount of cement. . Concrete admixtures mainly include industrial solid waste and natural minerals, such as fly ash, granulated blast furnace slag, silica fume and limestone powder. However, with the continuous improvement of construction technology and design level, the scale of concrete structures is getting larger and larger, and the engineering accidents of large-volume concrete cracking caused by changes in temperature and moisture inside cement-based materials are also increasing. The conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06C04B22/10C04B28/04
CPCC04B28/04C04B40/0042C04B2111/00017C04B2201/50C04B22/066C04B22/10C04B22/064C04B14/06
Inventor 邓敏恽进进莫立武徐玲玲黄晓军江飞飞黄蓓
Owner NANJING UNIV OF TECH
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