Research on the Influence of Seawater on the Properties of Sulphoaluminate Cement Concrete
Author(s): Youqiang Huang, Zhonghe Shui and Kai Wang
Paper category: Proceedings
Book title: 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): Changwen Miao, Wei Sun, Jiaping Liu, Huisu Chen, Guang Ye and Klaas van Breugel
Publisher: RILEM Publications SARL
Publication year: 2016
Total Pages : 13
Language : English
Abstract: Marine concrete is the most basic and the biggest amount of materials that used in marine engineering construction. Due to the long-term corrosion by the seawater, the wave splash, the sea breeze blowing and other physical and chemical effects, marine concrete has higher requirements on the mechanical properties and durability, especially on permeability and resistance to salt corrosion. This paper used sulphoaluminate cement (SAC) and ferroaluminate cement (FAC) to prepare C40, C50, C60 marine concrete, and the influence of three mixing or curing methods: fresh water mixing-fresh water curing, fresh water mixing-seawater curing and seawater mixing-seawater curing on concrete strength, microstructure and long-term performance were learned.
The results show that seawater curing almost has no influence on concrete compressive strength, seawater mixing will promote the development of early strength (1d, 3d), especially to OPC concrete, but decrease the long-term compressive strength (7d, 28d) of concrete about 10%. Seawater mixing of SAC and FAC has a great impact on the resistance to chloride permeability of concrete. Seawater mixing of SAC, FAC and OPC will greatly increase the shrinkage rate, admixtures MK and FA can improve the volume stability of concrete. XRD tests show that SAC and FAC concrete hydration products under seawater curing are as the same as the fresh water curing, while OPC concrete hydration products contain Friedel’s salt, and along with age growth, Friedel’s salt content increases gradually. Friedel’s salt are found in hydration products of three kinds of cements under seawater mixing, the chloride binding
capacity of three kinds of cements follow the order of OPC > FAC >SAC.
Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00