An Application of Rice Husk Ash (RHA) and Calcium Carbonate (CaCo₃) as Materal for Self-Healing Cement

Abstract:

Self-healing cement is a novel topic in concrete technology. Concrete is created to have its own ability to heal cracks. Crack closure is due to the material deposition of the gap so causing the crack closed. Materials used in this paper is mortar composition with ordinary portland cement replaced by calcium carbonate (CaCO₃) and rice husk ash. There are three testing presented in this paper. The first is compressive test to determine the compression applied to mortar for initial cracks. The second is an ultrasonic pulse velocity (UPV) test to observe the depth of cracks and density of each composition. The third is macroscopic investigation to observe cracks wide in each mixture. The maximum compressive strength of 22.46 MPa shown by specimens made with 10% rice husk ash and 10% calcium carbonate cement. By the end of healing process, it reached 23.18 MPa. It was also shown that in crack depth decreased from 38 mm to 16 mm. From this analysis, it can be concluded that rice husk ash (RHA) and calcium carbonate (CaCO₃) can be utilized as self-healing concrete materials.

• Periodical: Key Engineering Materials (Volume 673)
• Pages: 3-12
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.673.3
• Online since: January 2016
• Authors: Januarti Jaya Ekaputri*, Fahmi Firdaus Alrizal, Iqbal Husein, Triwulan Triwulan, Mohd Mustafa Al Bakri Abdullah
• Keywords: Calcite, Calcium Carbonate, Cracks, Mortar, Rice Husk Ash, Self-Healing

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