Device and method for testing low-temperature sulfate attack resistant performance of solid concrete

Abstract

The invention belongs to the field of concrete structure testing, and relates to a device and method for testing the low-temperature sulfate attack resistant performance of solid concrete. The devicecomprises a low-temperature box, a concrete attack box, a drilled hole, water absorbing sponge, an epoxy resin sealing layer, an anode, a cathode, a pulse generator, and a liquid outlet, wherein the concrete attack box is placed in the low-temperature box, and is used for the addition of a sulfate attack liquid after a core sample of a solid concrete structure is placed; the top end of the concrete core sample of the solid structure is covered by the epoxy resin sealing layer; the cathode is immersed in the sulfate attack liquid; the anode is inserted into the top of the concrete core sample;and the pulse generator supplies direct current pulse currents. The device and method provided by the invention has the advantages that the low-temperature sulfate attack resistant performance of thesolid concrete structure can be quickly and effectively tested, the operation is simple and convenient, and a testing cycle is short; and electrochemical parameter changes of the concrete are tested to represent the attack degree, so that the problems of low repeatability and low accuracy in the traditional testing method are overcome, and the testing method achieves a higher scientific level andhigher stability and is repeatable.

Description

technical field [0001] The invention belongs to the field of concrete structure testing, and relates to a device and method for testing the low-temperature sulfate corrosion resistance performance of solid concrete. Background technique [0002] Sulfate attack is one of the important factors that shorten the service life of concrete solid structures. As far as the type of sulfate attack is concerned, it can be mainly divided into gypsum type, ettringite type attack and Thaumasite form of sulfate attack (TSA for short), among which TSA erosion will lead to muddying of concrete materials and loss of strength , and then cause serious damage to the concrete structure, which greatly reduces the service life of the engineering entity structure. One of the notable characteristics of TSA erosion is that the object of corrosion damage is the cement hydration product C-S-H gel, which produces grayish-white muddy substances, which makes cement concrete lose its bonding properties. Th...

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Problems solved by technology

At the same time, the test period of this method is too long and the repeatability is not enough. For example, if it is tested whether the concrete reaches the KS150 grade, it often takes more than 180 days of test time

However, the American standard (ASTM C1012 / C1012M) generally adopts the test method for the length change of cement mortar under the immersion environment of sulfate solution. This method is mainly aimed at testing the sulfate corrosion resistance of cement mortar and cannot truly reflect the concrete structure in sulfate. Erosion Processes in the Environment

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