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Title: Optimum Mix Design for Internally Integrated Concrete with Crystallising Protective Material
Authors: Rahman, M
Al-Kheetan, M
Keywords: Fresh concrete;Concrete pavement;Crystallising material;Morphology;Compressive Strength;Flexural Strength;Water absorption;Protection
Issue Date: 2019
Publisher: American Society of Civil Engineers
Citation: Journal of Materials in Civil Engineering
Abstract: In this research, a Silica-based crystallising protective material was integrated into a fresh concrete mix to evaluate its efficacy in reducing water absorption while preserving the compressive strength level of the mixture. An optimum concrete mix design was determined, by producing several concrete mixes with different water to cement ratios (w/c) of 0.32, 0.37, 0.40, and 0.46, and treated with 2% and 4% of the crystallising admixture. Water absorption and the mechanical properties of the treated and control mixes were measured, using the Initial Surface Absorption Test (ISAT) and the compressive strength and the flexural strength tests respectively. Results showed that it is possible to obtain a water-resistant concrete without compromising its compressive strength if the right w/c ratio was used and the proper dosage of the crystallising material was added. In addition, results revealed that treatment is beneficial only in the case of producing concrete with a low w/c ratios of 0.32 and 0.37 and treated with the crystallising material. The compressive strength can increase up to 42% and with a significant drop in water absorption reaches 65%. Treated concrete was analysed thoroughly under the Scanning Electron Microscope (SEM) and X-Ray Diffraction instrument (XRD) to show the development of crystals with time and their interaction with the concrete mix.
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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