Method for testing dough recovery of ecological type porous concrete

Abstract

The invention relates to an experimental method for the frost resistance of ecotype cellular concrete, which adopts the cellular concrete fast freeze-thaw method to carry out evaluation on the frost resistance of the ecotype cellular concrete, generally, the test pieces are destroyed by above 100 times of freeze-thaw cycle, if the 'fast freeze method' is adopted, only a plurality of test pieces are destroyed, if the 'slow freeze method' is adopted, the test pieces are not destroyed by hundreds of cycle. Compared the 'fast freeze method' with and the 'slow freeze method', the cellular concrete fast freeze-thaw method can accurately and effectively evaluate the frost resistance of the cellular concrete, the cellular concrete fast freeze-thaw method experiment is characterized in that the icing pressure of the water with large volume in the voidage of the cellular concrete during the freezing process can be released to the unfreezed water, and the freeze-thaw process of the cellular concrete in natural environment is stimulated.

Description

technical field [0001] The invention relates to a method for testing the frost resistance of porous concrete, which belongs to the technical field of performance testing of civil engineering materials. Background technique [0002] The hard structures such as concrete and masonry used in conventional embankment revetment projects hinder the function of biological habitats in the riparian zone and affect the integrity of the river ecosystem structure. There are many continuous voids inside the ecological porous concrete, which has good water permeability and air permeability, and can greatly improve the surrounding environment. In addition, ecological porous concrete has certain mechanical properties, and is widely used in river embankment revetment projects in Japan, Europe and the United States and other countries. [0003] Porous concrete is subject to damage from freeze-thaw cycles when applied to embankment revetments. Compared with ordinary concrete, the main features...

AI Technical Summary

Problems solved by technology

In the "quick freezing method" test, during the freezing process of the large volume of water in the void of the porous concrete specimen, the water around the specimen freezes first, forming a closed ice layer, so that the freezing pressure of the unfrozen water in the middle cannot be released outward, such as figure 1 As shown in a, the freezing pressure is relatively high; the freezing and thawing characteristics of the "slow freezing method" are "air freezing and water melting", that is, freezing in the air and melting in the water, and there is no participation of large volumes of water in the void during the freezing process. It is also not suitable for evaluating the frost resistance of porous concrete

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