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High-performance concrete expansive agent

A high-performance concrete and expansion agent technology, applied in the field of high-performance concrete expansion agent, can solve the problems of insufficient shrinkage compensation, inability to adapt to the development of concrete strength, low expansion rate, etc., to reduce shrinkage cracks, excellent anti-crack and anti-seepage properties, and the effect of preventing shrinkage cracks

Inactive Publication Date: 2015-12-09
黄万忠
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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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  • High-performance concrete expansive agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Weigh the following raw materials in parts by weight: 30 parts of calcium sulfoaluminate, 8 parts of sepiolite, 11 parts of polytetrafluoroethylene powder, 9 parts of pentaerythritol, 1 part of benzenediol, and 10 parts of glass fiber powder;

[0018] 2. First, mix the sepiolite with the particle size of 55nm and the polytetrafluoroethylene powder with the particle size of 16μm, start the forced mixer, stir for 5min to make it evenly mixed, then start the mixer, add sulfoaluminate after an interval of 1min Calcium, pentaerythritol, benzenediol and glass fiber powder; continue to stir for 40 minutes, stir evenly, and finally package, which is the finished product.

Embodiment 2

[0020] 1. Weigh the following raw materials by weight: 32 parts of calcium sulfoaluminate, 10 parts of sepiolite, 9 parts of polytetrafluoroethylene powder, 3 parts of pentaerythritol, 1 part of benzenediol, 8 parts of glass fiber powder;

[0021] 2. First, mix the sepiolite with the particle size of 65nm and the PTFE powder with the particle size of 13μm uniformly, start the forced mixer, stir for 5min to make it evenly mixed, then start the mixer, add sulfoaluminate after an interval of 1min Calcium, pentaerythritol, benzenediol and glass fiber powder; continue to stir for 40 minutes, stir evenly, and finally package, which is the finished product.

Embodiment 3

[0023] 1. Weigh the following raw materials in parts by weight: 35 parts of calcium sulfoaluminate, 12 parts of sepiolite, 7 parts of polytetrafluoroethylene powder, 5 parts of pentaerythritol, 2 parts of benzenediol, 7 parts of glass fiber powder;

[0024] 2. First, mix the sepiolite with the particle size of 75nm and the polytetrafluoroethylene powder with the particle size of 10μm uniformly, start the forced mixer and stir for 5min to make it evenly mixed, then turn on the mixer, add sulfoaluminate after an interval of 1min. Calcium, pentaerythritol, benzenediol and glass fiber powder; continue to stir for 40 minutes, stir evenly, and finally package, which is the finished product.

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Abstract

The invention relates to the technical field of concrete admixture, in particular to a high-performance concrete expansive agent. The high-performance concrete expansive agent is prepared from, by weight, 30-40 parts of calcium sulphoaluminate, 8-16 parts of sepiolite, 4-11 parts of teflon powder, 3-9 parts of pentaerythrite, 1-4 parts of benzenediol and 5-10 parts of glass fiber powder. Shrinkage compensating of the high-performance concrete expansive agent has long effectiveness, the high-performance concrete expansive agent can be adapted to strength development of concrete, has excellent high-cracking-resistance impermeability, avoids that because cracking-resistance impermeability of concrete is insufficient, accumulated water permeability is generated, and the concrete can not be used and has high performance, and all the properties of the concrete expansive agent are improved and include the capacity of cracking resistance and impermeability, concrete compression strength and concrete breaking strength.

Description

Technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a high-performance concrete expansion agent. Background technique [0002] The volume of concrete shrinks in the initial setting or hardening process, and shrinkage stress is generated inside the structure. When the stress exceeds the tensile strength of the concrete, it will cause the concrete to crack and form shrinkage cracks. In order to prevent and reduce the temperature shrinkage cracks of the super-long concrete structure, the effective installation of post-pouring belts is a conventional measure, but the post-pouring belts extend the construction period, and the laying, welding and cleaning of the hair after the steel bars are broken will bring certain troubles to the filling construction. Good will leave hidden dangers. Therefore, it is necessary to compensate for the expansion of shrinkage concrete during the hardening process, and generate a small amount of pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26
Inventor 黄万忠
Owner 黄万忠
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