Influences of a new admixture MX on concrete durability

The performance of concrete with a new admixture MX was studied by using the freeze-thaw cycle, permeability and chemical attack test. The experimental results show that MX improves the durability of concrete. Within the optimum proportion ranges from 0.1% to 1%, the compressive strength of concrete...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2005-03, Vol.20 (1), p.117-120
Main Authors: Baoguo, Ma, Rongzhen, Dong, Hongbo, Zhu, Li, Zhang, Kaihong, Zhong, Xingyang, He, Zongjin, Li
Format: Article
Language:English
Subjects:
Compressive strength
Conduction heating
Conductive heat transfer
Durability
Freeze thaw cycles
Hydrochloric acid
Modulus of elasticity
Permeability
Sodium sulfate
Studies
Sulfuric acid
Weight loss
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Summary:The performance of concrete with a new admixture MX was studied by using the freeze-thaw cycle, permeability and chemical attack test. The experimental results show that MX improves the durability of concrete. Within the optimum proportion ranges from 0.1% to 1%, the compressive strength of concrete after freeze-thaw is increased by 20%-50%, and Young's modulus can be increased by 3.76-5.64 times. The strength and weight loss of concrete with 0.4% MX are respectively decreased by 28% and 60% after hydrochloric acid attack. The strength and weight loss of concrete with 0.4% MX are decreased by 5%-20% after sulfuric acid and sodium sulfate attack. The permeability of concrete with 1% MX at 28 days can be decreased by more than 30%. The investigation of the negative temperature property of MX and analysis on concrete composition and microstructure by MIP reveal that the heat conduction is resisted and the freezing procedure of solution in concrete pore is retarded due to the adding of MX. Moreover, the pore structure of concrete with MX is improved, thus improving the durability. Based on this study, a resistance model of MX to block the heat and mass transference was proposed, and the mechanism of durability improvement of concrete with MX was explained.[PUBLICATION ABSTRACT]
ISSN:1000-2413
1993-0437
DOI:10.1007/BF02870891