A heat of hydration inhibiting concrete expansion agent and its preparation method

A technology of hydration heat suppression and expansion agent, which is applied in the field of concrete, can solve the problems of unfavorable inhibition of concrete cracking, long expansion and stable period, and short expansion and stability period, so as to prolong the initial setting and final setting time and extend the expansion and stability period , the effect of good expansion performance

Active Publication Date: 2021-10-22
TIANJIN JINSHENGYUAN SPECIAL BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The expansive agent has a short expansion and stability period, which is not conducive to inhibiting concrete cracking in the later stage
[0005] In engineering, the self-shrinkage and drying shrinkage of concrete are generally compensated by adding a certain amount of expansion agent. At present, the commonly used expansion agent in my country is still calcium expansion agent, but the calcium expansion agent hydrates quickly in the early stage and releases heat rapidly. It is not conducive to controlling the temperature rise of hydration, so it is urgent to prepare a hydration heat-inhibiting expansion agent with large early expansion energy, long expansion stability period, and suppression of hydration temperature rise to solve the above problems

Method used

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  • A heat of hydration inhibiting concrete expansion agent and its preparation method
  • A heat of hydration inhibiting concrete expansion agent and its preparation method
  • A heat of hydration inhibiting concrete expansion agent and its preparation method

Examples

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Embodiment 1

[0032] This embodiment provides a heat of hydration inhibiting concrete expansion agent, which includes the following components in weight percentage, heat of hydration inhibiting expansion clinker 70wt%, gypsum 30wt%, and the heat of hydration inhibiting expansion clinker consists of the following The raw materials prepared in parts by weight are: 67 parts of limestone, 12 parts of gypsum, 3 parts of iron slag, 17 parts of bauxite and 1 part of copper oxide.

[0033] The preparation method of described a heat of hydration inhibiting type concrete expansion agent is:

[0034] (1) Mix the raw materials for preparing the heat of hydration inhibiting expansion clinker, crush and grind, pass through a 200-mesh sieve, and the sieve residue is ≤1.5%;

[0035] (2) Calcining the above mixture at a high temperature of 1250° C., keeping it warm for 30 minutes, and cooling naturally to obtain a heat of hydration inhibited expansion clinker;

[0036] (3) Mix and grind the heat of hydrati...

Embodiment 2

[0038] This embodiment provides a heat of hydration inhibiting concrete expansion agent. Compared with Example 1, the difference is that the heat of hydration inhibiting concrete expansion agent includes the following components by weight percentage, hydration 70 wt% heat-inhibited expansion clinker, 30 wt% gypsum, the hydration heat-inhibited expansion clinker is prepared from the following raw materials in parts by weight: 66.5 parts of limestone, 12 parts of gypsum, 3 parts of iron slag, bauxite 17 parts, 1.5 parts of barium chloride.

Embodiment 3

[0040] This embodiment provides a heat of hydration inhibiting concrete expansion agent. Compared with Example 1, the difference is that the heat of hydration inhibiting concrete expansion agent includes the following components by weight percentage, hydration 70 wt% of heat-inhibited expansion clinker and 30 wt% of gypsum. The hydration heat-inhibited expansion clinker is prepared from the following raw materials: 66 parts of limestone, 12 parts of gypsum, 3 parts of iron slag, bauxite 16 parts, 3 parts of titanium oxide.

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Abstract

The invention discloses a heat of hydration inhibiting concrete expansion agent and a preparation method thereof. The heat of hydration inhibiting concrete expansion agent is compounded by heat of hydration inhibiting expansion clinker and gypsum, wherein the heat of hydration inhibiting type The expanded clinker is made from the following raw materials by weight: 50-70 parts of limestone, 5-15 parts of gypsum, 2-5 parts of iron slag, 10-20 parts of bauxite, 0.1-3.0 parts of metal ions or metal oxides , through the use of ion doping technology, high temperature firing. The preparation method of the invention is simple and easy, and can effectively reduce the calcination temperature of the expansion agent clinker.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a hydration heat inhibiting concrete expansion agent and a preparation method thereof. Background technique [0002] Due to the finer and finer cement used in modern concrete, the strength of concrete has developed rapidly, so that concrete cracks that only appear in mass concrete appear in various engineering projects. Concrete shrinkage, especially drying shrinkage and temperature shrinkage, is a major cause of early cracking and deformation of concrete. Therefore, effective control of early cracking in concrete must be considered from two aspects: reducing shrinkage and reducing heat release from hydration. [0003] Chinese Patent No. CN201110053668.9 relates to an expanded clinker, which is calcined by mixing limestone and iron powder as raw materials, wherein: in the raw material, the content of calcium carbonate calculated as CaO content is: 48-53% by weight; The content ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14C04B28/02
CPCC04B28/02C04B40/0039C04B2103/0068C04B22/143C04B14/28C04B18/142C04B14/303C04B14/309C04B22/124C04B14/305C04B18/141C04B18/12C04B14/06C04B14/02C04B2103/302
Inventor 何福夏瑞杰田步生宋文来
Owner TIANJIN JINSHENGYUAN SPECIAL BUILDING MATERIALS
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