Accelerated degradation testing method and judging method of cement-based material under restrained condition
A cement-based material, accelerated deterioration technology, applied in the analysis of materials, suspensions and porous materials, analysis of solids using sonic/ultrasonic/infrasonic waves, etc. To achieve the effect of convenient determination method, convenient operation and low cost
Inactive Publication Date: 2016-09-28
SOUTHEAST UNIV
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Problems solved by technology
However, due to environmental effects such as high salt, high temperature difference, low humidity, high temperature / freezing, etc., concrete materials in harsh environments such as my country's coastal areas and western salt lakes often fail prematurely, which in turn affects engineering structures, resulting in a significant reduction in the service life of many infrastructures , huge economic losses, seriously restricting marine development
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[0039] (1) Make test pieces of cement-based materials;
[0040] According to the mix ratio of cement: water: sand = 1: 0.5: 3, the cement mortar specimen is prepared, and the size is 40mm × 40mm × 160mm. Two bolts with a length of 8 cm are pre-embedded at both ends of the specimen, and the exposed distance is 4 cm. Prepare deterioration test pieces and comparison test pieces;
[0041] (2) Prepare a certain concentration of salt solution required for the accelerated deterioration test;
[0042] In order to accelerate the deterioration process, Mg with a mass fraction of 5% was prepared 2 SO 4 , 10% NaCl and 10% Na 2 SO 4 Mixed salt solution for accelerated deterioration test. At the same time, the dry-wet cycle method is adopted. The dry-wet cycle system is soaking at room temperature (20°C) for 8 hours, and drying at 50°C for 16 hours. The 24h is a cycle.
[0043] (3) Make the restraint device required for the accelerated test;
[0044] The constraining device is made ...
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Abstract
The invention provides an accelerated degradation testing method and judging method of a cement-based material under a restrained condition. The accelerated degradation testing method and judging method comprises the following steps: manufacturing a cement-based test piece with bolts embedded on two ends; preparing a saline solution which is used for an accelerated degradation test; manufacturing a restraining device by utilizing a material with higher elasticity modulus; enabling the bolts to penetrate through the restraining device when a degradation test is carried out, connecting the bolts by nuts, and regulating the restrain degree of the test piece through an electro-hydraulic servo universal testing machine; carrying out real-time monitoring on ultrasonic wave parameters and displacement change of the test piece by adopting a non-metal ultrasonic detecting analyzer and a displacement sensor during a degradation process, and carrying out statistical analysis on microporous structure parameters of the test piece by adopting an X-ray computer tomography scanning technology before and after degradation. Compared with a traditional degradation testing method, the restraining device is more flexible and convenient, and the degradation effect is more obvious; compared with a traditional degradation judging method, the accelerated degradation testing method and judging method can monitor the degradation process in real time, and the statistic analysis method of the microporous structure parameters is more direct and reliable.
Description
technical field [0001] The invention relates to a durability test method and a judgment method of building materials in the field of civil engineering materials, in particular to an accelerated deterioration test method and a judgment method of cement-based materials in a restrained state. Background technique [0002] At present, concrete materials have become the most widely used and used building structure materials in the world, and their performance and time-varying properties directly affect the service performance and service life of major foundation projects. However, due to environmental effects such as high salt, high temperature difference, low humidity, high temperature / freezing, etc., concrete materials in harsh environments such as my country's coastal areas and western salt lakes often fail prematurely, which in turn affects engineering structures, resulting in a significant reduction in the service life of many infrastructures , Huge economic losses, seriously...
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IPC IPC(8): G01N17/00G01N15/08G01N29/07G01N29/12
CPCG01N17/00G01N15/088G01N29/07G01N29/12G01N2015/0833G01N2291/0232
Inventor 钱春香陈怀成陶强兵黄浩良
Owner SOUTHEAST UNIV