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Concrete expansion agent

An expansion agent and concrete technology, applied in the field of concrete expansion agent, can solve the problems of inability to adapt to the development of concrete strength, insufficient compensation for shrinkage, low expansion rate, etc., to improve long-term volume stability, overall compactness improvement, porosity reduced effect

Active Publication Date: 2015-03-25
GUILIN HUAYUE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, expansion agents have been widely used as compensation for shrinkage, but there are still deficiencies in the composite expansion agents on the market: ①The expansion rate is low; ②The compensation for shrinkage is not enough, and it cannot adapt to the strength development of concrete

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] First, add 5kg of magnesium oxide to 23kg of fly ash with a specific surface area of ​​700㎡ / kg, start the forced mixer, stir for 5 minutes to make it evenly mixed, then start the mixer, and add 18kg of powdered naphthalene-based water reducing agent, 4kg sodium tripolyphosphate, 10kg methylcellulose, 35kg calcium sulfoaluminate and 5kg sodium gluconate; continue to stir for 40 minutes, stir evenly, and finally pack it with a woven bag lined with a plastic bag, which is the finished product.

Embodiment 2

[0034] First, add 4kg of magnesium oxide to 18kg of mineral powder with a specific surface area of ​​800㎡ / kg, start the forced mixer, stir for 6 minutes to make it evenly mixed, then start the mixer, and add 23kg of powdered melamine-based water reducer after an interval of 2 minutes , 6kg sodium tripolyphosphate, 8kg hydroxyethyl methylcellulose, 37kg calcium sulfoaluminate and 4kg sodium gluconate; continue to stir for 40 minutes, stir evenly, and finally pack it in a woven bag with a lined plastic bag, which is the finished product .

Embodiment 3

[0036] First, add 3kg of magnesium oxide to 20kg of fly ash with a specific surface area of ​​850㎡ / kg, start the forced mixer, stir for 7 minutes to make it evenly mixed, then start the mixer, and add 21kg of powdered naphthalene-based Aqua, 5kg sodium tripolyphosphate, 8kg hydroxypropyl methylcellulose, 40kg calcium sulfoaluminate and 3kg sodium gluconate; continue to stir for 40 minutes, stir evenly, and finally pack it in a woven bag with a lined plastic bag, that is, for the finished product.

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Abstract

The invention relates to the technical field of concrete admixtures, and in particular relates to a concrete expansion agent. The concrete expansion agent is prepared from the following raw materials in percentage by weight: 35-45% of calcium sulphoaluminate, 1-5% of magnesium oxide, 18-25% of a plasticized water reducer, 16-23% of ultrafine mineral powder, 2-7% of sodium tripolyphosphate, 5-10% of a water holding material and 1-5% of sodium gluconate. The concrete expansion agent disclosed by the invention can be used for solving the problems of high expansion rate, insufficient shrinkage compensating effect and the like of an existing expansion agent; meanwhile, if being mixed in concrete, the concrete expansion agent disclosed by the invention can be used for improving the concrete strength in middle and later stages and properly prolonging the setting time of the concrete; and the concrete expansion agent is also excellent in high crack resistance and seepage control performance, good in adaptability, and suitable for concretes differing in strength grade.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a concrete expansion agent. Background technique [0002] Concrete will shrink in volume at the initial stage of setting or during hardening, and shrinkage stress will be generated inside the structure. When the stress exceeds the tensile strength of concrete, it will cause the concrete to crack and form shrinkage cracks. In order to prevent and alleviate the temperature shrinkage cracks of super-long concrete structures, it is a routine measure to effectively install the post-cast belt, but the post-cast belt prolongs the construction period, and the lapping, welding and cleaning of the broken steel bars all bring certain troubles to the joint filling construction. Good will leave hidden dangers. Therefore, it is necessary to use the expansion effect of shrinkage-compensating concrete in the hardening process to generate a small amount of precompressive stress in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38
Inventor 尹丹黄煌陈威王恒阮长泰
Owner GUILIN HUAYUE ENVIRONMENTAL PROTECTION TECH CO LTD
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