Concrete anti-freezing and anti-cracking agent

An anti-cracking agent and concrete technology, applied in the field of concrete anti-freezing and anti-cracking agent, can solve problems such as poor anti-freezing and anti-cracking performance, and achieve the effects of improving waterproof and impermeability, improving compactness and strength, and increasing compactness.

Active Publication Date: 2017-08-29
YELLOW RIVER ENG CONSULTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The invention provides an antifreeze and anticrack agent for concrete, aiming to solve the problem of poor antifreeze and anticrack performance of existing concrete

Method used

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  • Concrete anti-freezing and anti-cracking agent
  • Concrete anti-freezing and anti-cracking agent
  • Concrete anti-freezing and anti-cracking agent

Examples

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Embodiment 1

[0020] The first step, drying: Weigh an appropriate amount of muscovite powder (or phlogopite, which has the same effect as muscovite), and dry it in an oven at 105 °C for 48 hours to remove moisture; the above muscovite powder is a commercially available micron-sized flake powder material, where SiO 2 The content is 62.4%, Al 2 o 3 The content is 20.4%.

[0021] The second step, pulverization: further pulverize the above-mentioned dried muscovite powder with a high-fineness pulverizer to obtain a flake micropowder with a thickness of about 2.5 μm in a microscopic state. When sieved with an 80 μm cement negative pressure sieve, the remaining Below 15%.

[0022] The third step, hydrophobic modification treatment: take 98 parts by weight of the muscovite powder prepared in the second step, add 1 part by weight of KH-550 silane coupling agent and 1 part by weight of methyl silicone oil, and send it to 150 ° C Perform high-temperature modification treatment in the powder surfa...

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Abstract

The invention discloses a concrete anti-freezing and anti-cracking agent. The concrete anti-freezing and anti-cracking agent is formed by mixing 95 parts by weight of hydrophobic modified mica powder with 5 parts of nano silicon dioxide. Hydrophobic modified mica is prepared by a method comprising the following steps: first step, drying white mica or bronze mica; step two, pulverizing the white mica or the bronze mica into flaky micro-powder of which the granularity is 80 mu m, the screen residues are 15% or below and the thickness is 2.5 mu m; and third step, after mixing a silane coupling agent, methylsilicone oil and white mica powder or bronze mica powder which is prepared in the second step according to a formula, carrying out modification treatment on the mixture at the temperature of 150 DEG C, and the pulverizing the mixture to obtain the finished hydrophobic modified mica powder. The shrinkage of the concrete added with the anti-freezing and anti-cracking agent is greatly reduced, and the anti-cracking property is greatly improved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a concrete antifreeze and anticrack agent. Background technique [0002] The frost and crack resistance of concrete is an important index to evaluate the performance of concrete. [0003] When the ambient temperature drops, the volume of the water in the capillary pores of the concrete will increase by about 9% after freezing to form water pressure, which will cause damage if there is nowhere to release the pressure inside the saturated concrete. At present, air-entraining agents are often used to improve the frost resistance of concrete. The air-entraining agent can introduce a large number of evenly distributed, stable and closed micro-bubbles into the concrete during the mixing process. These micro-bubbles can accommodate the migration of free water, ease the water pressure during freezing, and significantly improve the ability of concrete to withstand repeated fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42
CPCC04B40/0042C04B2103/601C04B14/20C04B14/06C04B24/42C04B20/008
Inventor 张金良房后国杨林陈学理
Owner YELLOW RIVER ENG CONSULTING
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