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Behavior of high performance concrete pastes with different mineral admixtures in simulated seawater environment

Authors :
Tang Xinglei
Gelong Xu
Zhenjie Lv
Zhongwen Wang
Xiaoli Ji
Weiguo Shen
Qingjun Ding
Chuanzhou Han
Source :
Construction and Building Materials. 187:426-438
Publication Year :
2018
Publisher :
Elsevier BV, 2018.

Abstract

With the blooming of ocean construction engineering, the influence of seawater on concrete durability draws increasing attentions. This paper investigates the performances of five high performance concrete (HPC) pastes, including pure cement paste, fly ash (FA) paste, limestone powder (LP) paste, ground granulated blast-furnace slag (GGBS) paste and silica fume (SF) paste, soaked in simulated seawater. The results indicate that the addition of FA would improve the strength of paste soaked in simulated seawater compared to pure cement paste from 90 d to 360 d and the order of strength in 360 d was, FA paste > Pure cement paste > LP paste > GGBS paste > SF paste. All mineral admixtures except LP can inhibit the expansion of paste soaked in simulated seawater at later age and the order of expansion rate in 360 d was, LP paste > Pure cement paste > FA paste > GGBS paste > SF paste. The internal structure of pastes soaked in simulated seawater at 360 d mainly contains Ca(OH)2, AFt, gypsum, Mg(OH)2, C3S and C2S while the external structure of pastes mainly contains Mg(OH)2, CaCO3 and AFt through the XRD spectra. SEM results proved that the addition of mineral admixtures can make the structure of the pastes denser.

Details

ISSN :
09500618
Volume :
187
Database :
OpenAIRE
Journal :
Construction and Building Materials
Accession number :
edsair.doi...........d7dd2c5bff3a58f2ccf446ea7e880215