Expansive agent for alkali slag concrete and its application method

A technology of concrete and alkali slag, applied in the field of expansion agent, can solve the problems of limiting solubility and dissolution speed, limiting the formation of expansion components and expansion effect, etc.

Active Publication Date: 2019-04-26
张彭成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The expansion mechanism of magnesium-based and calcium-based expansion agents is to form volume-expanding hydroxides, and the strong alkaline environment greatly limits the solubility and dissolution rate of calcium oxide and magnesium oxide in water, which also limits the formation and dissolution of expansion components. swelling effect

Method used

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  • Expansive agent for alkali slag concrete and its application method

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Effect test

Embodiment 1

[0037]An expansion agent for alkali slag concrete, which is composed of activated magnesia and sodium carbonate, wherein the ratio of activated magnesia and sodium carbonate is 1 part of molar mass of activated magnesia: 1 part of molar mass of sodium carbonate, activated magnesia The mass ratio of the active powder material to the alkali slag concrete is 3:100.

[0038] The method of using the expansion agent for alkali slag concrete that adopts the above-mentioned components when adopting solid sodium hydroxide as the activator comprises the following steps,

[0039] The first step is the preparation of raw materials. Raw materials include at least active powder materials, solid sodium hydroxide, sodium carbonate, active magnesium oxide, aggregate and mixing water;

[0040] The second step is the mixing of raw materials, adding active powder materials, solid sodium hydroxide, sodium carbonate, active magnesium oxide, and aggregate solid components into the stirring device i...

Embodiment 2

[0043] An expansion agent for alkali slag concrete, which is composed of activated magnesia and sodium carbonate, wherein the ratio of activated magnesia and sodium carbonate is 1 part of molar mass of activated magnesia: 1 part of molar mass of sodium carbonate, activated magnesia The mass ratio of the active powder material to the alkali slag concrete is 4.1:100.

[0044] The method of using the expansion agent for alkali slag concrete that adopts the above-mentioned components when adopting liquid water glass and dissolved sodium hydroxide as an activator comprises the following steps,

[0045] The first step is the preparation of raw materials. The raw materials include at least active powder materials, water glass solution or sodium hydroxide solution, sodium carbonate, activated magnesia, aggregate and mixing water;

[0046] The second step is the pretreatment of raw materials, dissolving sodium carbonate in water glass solution or sodium hydroxide solution to form a mix...

Embodiment 3

[0049] An expansion agent for alkali slag concrete, which is composed of active magnesium oxide and potassium carbonate, wherein the ratio of active magnesium oxide and potassium carbonate is 1 part of molar mass of active magnesium oxide: 2.5 parts of molar mass of potassium carbonate, active magnesium oxide The mass ratio of the active powder material to the alkali slag concrete is 2.2:100.

[0050] The method of using the expansion agent for alkali slag concrete that adopts the above-mentioned components when adopting solid sodium hydroxide as the activator comprises the following steps,

[0051] The first step is the preparation of raw materials. Raw materials include at least active powder materials, solid sodium hydroxide, potassium carbonate, active magnesium oxide, aggregate and mixing water;

[0052] The second step is the mixing of raw materials, adding active powder materials, solid sodium hydroxide, potassium carbonate, active magnesium oxide, and aggregate solid ...

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PUM

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Abstract

The invention relates to an expander for alkali slag concrete, composed of activated magnesium oxide mixture and a mixture of one or two of alkali metal carbonate and alkali metal bicarbonate. The invention also relates to a method of using the above expander, comprising a method of use when solid sodium hydroxide is used as an activator, including: preparing raw materials, mixing the raw materials, adding water and stirring to obtain alkali slag concrete mixture, and also comprising a method of use when liquid water glass and dissolved sodium hydroxide are used as activators, including: preparing raw materials, pretreating and stirring the raw materials, and stirring well to obtain concrete mixture.

Description

technical field [0001] The invention relates to an expansion agent for alkali slag concrete and the technical field of use thereof, in particular to an expansion agent mainly composed of magnesium oxide and sodium carbonate and a use method thereof. Background technique [0002] Alkali slag concrete is a new type of environmentally friendly concrete; alkali slag concrete uses finely ground slag powder with pozzolanic activity, fly ash, ground slag, ground calcined coal gangue, calcined metakaolin, etc. as raw materials, and sodium hydroxide , Sodium carbonate, water glass and other alkaline substances are alkali-activated gelling materials composed of activators. In actual engineering, sodium hydroxide or water glass is often used as the activator; this is mainly due to the fact that sodium hydroxide is easier to purchase, transport and store; The construction performance and adjustable performance of the mixture are better, and the mechanical properties of the concrete aft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06C04B28/00
CPCC04B28/006C04B40/0039C04B22/10C04B22/066C04B22/06C04B14/02C04B22/08
Inventor 张彭成杨长辉陈科黄刚王勇威王新江敏刘亚文肖兵
Owner 张彭成
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