Ultra-low temperature freeze-thaw cycle test method of cement-based material

A cement-based material, freeze-thaw cycle technology, applied in the direction of analysis of materials, preparation of test samples, weighing by removing certain components, etc., can solve the problem of large volume of concrete specimens, increased workload, and power consumption of test equipment Large volume and other issues

Inactive Publication Date: 2010-07-28
CHONGQING UNIV +1
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  • Description
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  • Application Information

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Problems solved by technology

However, even if the freeze-thaw cycle test is carried out using the quick freezing method, it takes nearly three months from the concrete forming, curing to the end of the test, which brings inconvenience to the construction

Method used

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  • Ultra-low temperature freeze-thaw cycle test method of cement-based material
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  • Ultra-low temperature freeze-thaw cycle test method of cement-based material

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Embodiment Construction

[0022] The purpose of the present invention is achieved through such technical solutions:

[0023] 1. Mix cement concrete or mortar according to the design mix ratio, and the shape is 70.7×70.7×70.7mm 3 For cube specimens, the concrete should pass through a 20mm sieve before molding, the formwork should be removed 24 hours after molding, and the standard curing room should be cured for 28 days;

[0024] 2. The freeze-thaw test starts when the specimen is 28 days old. The specimen is taken out from the curing place 72 hours before the freeze-thaw, and the appearance inspection is carried out, and then the freeze-thaw test is carried out after soaking in water at a temperature of 20±5°C for 72 hours. (The water surface should be at least 10mm above the top surface of the specimen).

[0025] 3. After soaking, take out the test piece, wipe off the surface moisture with a damp cloth, weigh it, and measure the initial pulse velocity of the two pairs of sides of the test piece perpe...

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Abstract

The invention relates to an ultra-low temperature freeze-thaw cycle test method of a cement-based material. In the method, liquid nitrogen is taken as a freezing raw material, and with utilization of the ultra-low temperature effect of the freezing raw material in gasification, the matrix of the cement-based material is damaged from the gel pore level so as to speed up freeze-thaw damage progress and quickly evaluate the freezing resistance and durability of the cement-based material. The invention achieves the convenience and quickness of the freeze-thaw cycle test of the cement-based material, and solves the problem of inconveniences of construction work and quality control due to slow process of the freeze-thaw cycle test. Moreover, the invention has the advantages of convenient, fast, good economic benefit and the like.

Description

technical field [0001] The invention relates to a freeze-thaw cycle test method for cement-based materials, in particular to an ultra-low temperature freeze-thaw cycle test method for cement-base materials. Background technique [0002] Cement concrete is the most widely used and used building material in the world today. It can maintain stable performance for a long time in the environment where it is used. Therefore, it is often considered as a durable material. However, this is not always the case, as environmental factors and its own conditions can have a serious impact on its durability. Cement concrete freeze-thaw damage is a common durability problem. In most parts of northern my country, freeze damage is the main cause of premature deterioration of concrete structures. Once some important projects are damaged, it will cause huge economic losses to the country. People bring potential safety hazards. Therefore, the study of freeze-thaw damage of cement-based materials ...

Claims

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Application Information

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IPC IPC(8): G01N5/04G01N29/07G01N3/00G01N1/42
Inventor 叶建雄李厚伦杨长辉陈越张靖陈本书张智强王冲
Owner CHONGQING UNIV
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