Investigations on the development of the permeability properties of binary blended concrete with nano-SiO2 particles

• Main Authors: Najigivi, Alireza, Abdul Rashid, Suraya, Abd. Aziz, Farah Nora Aznieta, Mohd Salleh, Mohamad Amran
• Format: Article
• Language: English
• Published: SAGE Publications 2011
• Online Access: http://psasir.upm.edu.my/id/eprint/23377/1/Investigations%20on%20the%20development%20of%20the%20permeability%20properties%20of%20binary%20blended%20concrete%20with%20nano.pdf; http://psasir.upm.edu.my/id/eprint/23377/; https://journals.sagepub.com/doi/10.1177/0021998310389091
• Institution: Universiti Putra Malaysia

Water permeability of cement-based concrete has been recognized as a critical intrinsic property highly affecting the durability of reinforced concrete. An experimental study was done, designed to examine the water permeability and setting time of Portland cement mortar with nano-SiO2 admixed at 0.5, 1, 1.5, and 2 wt% of cement. The percentage, velocity, and coefficient of water absorption tests results showed that the incorporation of nano-SiO2 particles improved the water penetration resistance of the binary-blended concrete. Such improvements were especially significant when using 2 wt% of nano-SiO2. The experimental results revealed that the admixing of nano-SiO2 particles not only led to denser cement mortar but also changed the morphology of cement hydration products. Mechanisms were proposed to explain the physicochemical changes induced by the nano-SiO2 particles and the specific surface area of them is demonstrated as one of the key factors. Considering the higher strength and durability is promising their use in binary-blended concrete.