Measures of Improving Durability of Low-strength Hydraulic Concrete
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Abstract:
Hydraulic concrete contains low cementitious materials and has low strength grade. The surface quality of hydraulic concrete after forming is a key factor that affects the density and low-permeability of hydraulic concrete, and it is also an important factor to improve the durability of hydraulic concrete. Based on the high quality requirements of hydraulic concrete in the Suining 2nd Pumping Station of the Eastern Route of the South-to-North Water Diversion Project, the different qualities of low-strength hydraulic concrete with the moulds pasted controlled permeability framework liner (CPFL) and common moulds were investigated. The results based on the in-situ engineering tests and durability tests of hydraulic concrete at the bottom plane of pumping station showed that the surface of concrete with different proportions using CPFL is dense and smooth without any defects such as holes and bubbles, and the compactness has been improved and rebound strength has been increased greatly. Moreover, the durability indexes such as freeze-thaw, carbonation, and abrasion have also been improved. Consequently, using CPFL is an effective measure to strengthen the durability of low-strength concrete.
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