Effect of the Types of Superplasticizers on the Fresh, Mechanical, and Durability Properties of the High-Performance Concrete

摘要

The aim of this study is to examine the effect of the types of superplasticizers (SPs) on the properties of the high-performance concrete (HPC). Three types of SPs, i.e., polycarboxylate- based (PCA) SP, sulfonated naphthalene-formaldehyde with 0.5 % sodium sulfate (LSNF) SP, and sulfonated naphthalene-formaldehyde with 16.8 % sodium sulfate (HSNF) SP, were used. The fresh, mechanical, durability properties, and water porosity of the SPs concrete were tested. Utilizing SPs in the concrete increased the initial slump and the water porosity of the concrete, reduced the mechanical properties of the concrete. The SPs-blended concrete had the higher carbonation depth and chloride ion diffusion coefficient, the better durability properties under drying-wetting cycles than the control concrete. Moreover, PCA SP of the lower dosage than LSNF, HSNF SPs was used in the concrete to achieve the same initial slump of the concrete. The concrete containing 0.28 % PCA SP had the higher slump preservation and mechanical properties, the lower water porosity, carbonation depth, and chloride ion diffusion coefficient than that with 0.8 % LSNF SP, 1.0 % HSNF SP. The concrete mixtures with 0.8 % LSNF SP, 1.0 %, HSNF SP were more effective on resistance damage under drying-wetting cycles than that with 0.28 % PCA SP.