Method for determining hardened cement-base material shrinking and cracking
A technology of cement-based materials and measurement methods, applied in the fields of material science and engineering science, can solve problems such as cracking of cement concrete, and achieve the effects of convenient operation, simple process, great practical application value and social value
Inactive Publication Date: 2010-12-01
TONGJI UNIV
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Problems solved by technology
The purpose of the present invention is to disclose a method for testing the dehydration drying shrinkage and cracking performance of hardened cement-based materials. The method can obtain results in a short period of 3 to 20 days, thereby guiding the adjustment of the formula. Positive, solve the cracking problem of cement concrete
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Abstract
The present invention relates to a technological process for determining drying shrinkage cracking property of hardened cement base material. Said process includes the following steps: firstly, preparing hardened cement base material for test; pouring it into the between of internal mould and external mould of steel cylindrical test mould assembled by using external mould, internal mould and bottom plate: after it is formed, curing for 1-14 days, under the relative humidity with 5-20% heating in the speed of 2-10 deg.C / h to maximum temperature 40-80 deg.C, retaining constant temperature for 8-48h; finally adopting reading microscope to define crack width of external wall of test piece, and utilizing the crack width d to sectionally measure crack length Li, utilizing crack width weighted value Ai table and adopting W=sigma (Ai X Li) to calculate cracking weighted value W, and using it as characteristics of drying shrinkage cracking property of hardened cement base material. Said invention can obtain result within 3-20 days.
Description
A method for determining shrinkage cracking of hardened cement-based materials technical field The invention relates to a method for measuring the drying shrinkage and cracking performance of hardened cement-based materials (cement paste, mortar, concrete and composite materials thereof), and belongs to the technical field of material science and engineering science. Background technique Cement concrete is one of the most widely used man-made building materials in the world. At present, the annual output of cement in my country has reached 860 million tons, and the annual cement concrete consumption has reached several billion cubic meters. For quite a long period of time in the future, cement concrete will still be the main building material of modern engineering construction in our country. Moreover, because it has the advantages of wide application range, cheap price, easy casting, relatively durable, and can effectively use some industrial solid waste to make energy-s...
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IPC IPC(8): G01N25/00G01B11/02G01N33/38G01N1/28
Inventor 马一平王培铭
Owner TONGJI UNIV