Compressive Strength, Chloride Diffusivity and Pore Structure of Coral Sand Concrete with Metakaolin and Slag

Author(s): Shukai Cheng, Zhonghe Shui and Tao Sun
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
Print-ISBN: 978-2-35158-188-9
e-ISBN: 978-2-35158-189-6
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 408-417
Total Pages : 10
Language : English

Abstract: The aim of this research was to prepare coral sand concretes and to improve their properties with metakaolin (MK) and slag. Coral sand obtained from coral reef of high seas which was crushed and sieved to produce fine aggregates. A various of concretes with waterto- bind (w/b) ratio of 0.4 were produced using coral sand, and the replacement level of MK and slag with 5% and 15% respectively were also utilized for the purpose of comparing the performance of coral sand concrete. The mechanical and durability properties of the coral sand concretes were determined in 28 days of standard curing period. The pore size distribution and porosity of the concretes were also measured. Based on test results, the effect of MK and slag on the porosity was discussed. It was found that concretes produced with MK and slag achieved higher early strength and relatively better durability properties, and lower porosity and smaller pore sizes than the control groups. The pozzolanic reaction combination of aggregate and cement paste and optimize the composition and structure of cement paste of interfacial transition zone (ITZ). Moreover, the combination of MK and slag provided further enhancement in permeability and corrosion resistance of the concretes.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00