Salt freezing-dry and wet cycle coupling test device and method for cement-based materials

Abstract

The invention relates to a salt freezing-dry and wet cycle coupling test device and method for cement-based materials. The test device comprises a test chamber provided with a thermal insulation board, wherein a humidifier and an air outlet are arranged on each of two sides of the test box from top to bottom sequentially, a plurality of test pieces and temperature and humidity sensors are arrangedin the test chamber, the left side of each test piece is connected with a liquid injection pipe, the right side of each test piece is connected with a liquid drainage pipe, and an automatic liquid injection device and an automatic liquid drainage device are arranged below the test chamber. The test method comprises steps of two-time salt freezing and one-time dry and wet cycle which form a test cycle system of salt freezing-dry and wet cycle. The device and the method have the advantages that through multiple single-sided salt freezing-dry and wet cycle tests, key performance indexes of concrete can be obtained, the durability of concrete is reflected, and a basis is provided for durability design of a concrete structure in the seasonally frozen region. Through evaluation of different types of concrete, the concrete material applicable to the seasonally frozen region can be selected preferably through comparison and analysis.

Description

technical field [0001] The invention relates to a technology for testing the durability of cement-based materials, in particular to a cement-based material salt freeze-drying and wet cycle coupling test device and method. Background technique [0002] Concrete salt freeze damage caused by deicing salt is one of the main diseases of concrete bridges and pavements in seasonally frozen regions. In order to improve the durability of concrete structures, designers put forward stricter requirements for concrete materials. At present, the rapid freeze-thaw method and the single-sided salt freeze method are the main test methods for evaluating the frost resistance and salt freeze resistance of concrete, but these two methods are rapid test methods for a single factor, but in fact the concrete structure is affected by many factors. Coupling. The invention proposes a salt freezing-drying and wet cycle coupling test method, which is more in line with the actual use environment of the...

AI Technical Summary

Problems solved by technology

At present, the rapid freeze-thaw method and the single-sided salt freeze method are the main test methods for evaluating the frost resistance and salt freeze resistance of concrete, but these two methods are rapid test methods for a single factor, but in fact the concrete structure is affected by many factors. Coupling

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