Crumb rubber geopolymer mortar at elevated temperature exposure

Archives of civil engineering

article

Ahmad Azrem Azmi¹  Mohd Mustafa Al Bakri Abdullah²  Che Mohd Ruzaidi Ghazali³  Romisuhani Ahmad⁴  Ramadhansyah Putra Jaya⁴  Shayfull Zamree Abd Rahim⁴  Mohammad A. Almadani⁵  Jerzy J. Wysłocki⁶  Agata Śliwa⁷  Andre Victor Sandu⁸ 

[1] Center of Excellence Geopolymer and Green Technology, University Malaysia Perlis;Faculty of Chemical Engineering Technology, University Malaysia Perlis;Faculty of Ocean Engineering Technology and Informatics, University Malaysia Terengganu;Faculty of Mechanical Engineering Technology, University Malaysia Perlis;Department of Civil Engineering, Faculty of Engineering – Rabigh Branch, King Abdulaziz University;Department of Physics, Częstochowa University of Technology;Division of Materials Processing Technology and Computer Techniques in Materials Science, Silesian University of Technology;Faculty of Material Science and Engineering, Gheorghe Asachi Technical University of Iasi

关键词: fly ash;    geopolymer;    crumb rubber;    elevated temperature exposure;   

DOI  :  10.24425/ace.2022.141875

学科分类：建筑学

来源: Polska Akademia Nauk * Instytut Podstawowych Problemow Techniki / Polish Academy of Sciences, Institute of Fundamental Technological Research

【 摘 要 】

Low calcium fly ash is used as the main material in the mixture and the crumb rubber was used in replacing fine aggregates in geopolymer mortar. Sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) which were high alkaline solution were incorporated as the alkaline solution. The fly ash reacted with the alkaline solution forming alumino-silicate gel that binds the aggregate to produce a geopolymer mortar. The loading of crumb rubber in the fly ash based geopolymer mortar was set at 0% (CRGM-0), 5% (CRGM-5), 10% (CRGM-10), 15% (CRGM-15), and 20% (CRGM-20), respectively. NaOH solution (12M) and Na2SiO3 solution ratio is set constant at 2.5 for all geopolymer mixture and the fly ash to alkali activator ratio was kept at 2.0. The CRGM at 28 days of curing time was exposed to elevated temperature at 200°C, 400°C, 600°C and 800°C. The weight loss of the CRGM increases with increasing temperature at all elevated temperatures. However, the density and compressive strength of CRGM decrease with an increase of crumb rubber loading for all elevated temperature exposure. The compressive strength of CRGM reduced due to the fact that rubber decomposes between 200°C and 600°C thereby creating voids. CRGM-15 and CRGM-20 showed cracks developed with rough surface at 800°C. Image obtained from scanning electron microscope (SEM) showed that, the CRGM changed significantly due to the decomposition of crumb rubber and evaporation of the free water at 400°C, 600°C and 800°C.

【 授权许可】

Unknown