Properties of Asphalt Modified by Aluminum Trihydrate/Organic Montmorillonite Composite

Abstract

Abstract: The objective of this research is to develop a flame retardant asphalt modified by aluminum trihydrate (ATH) and two kinds of organic montmorillonites (OMMT-C, OMMT-F) and investigate the effect of ATH/OMMT composite flame retardant on properties of styrene-butadiene-styrene (SBS) modified asphalt. The conventional performance of ATH/OMMT modified asphalt was evaluated by testing penetration, softening point and ductility. The limit oxygen index (LOI) and smoke density (SDR) were obtained to investigate the flame retardant and smoke suppression performance of ATH/OMMT modified asphalt. The optimum content of ATH/OMMT composite flame retardant was determined based on the comprehensive index method. The rheological properties of ATH/OMMT modified asphalt were investigated by dynamic shear rheological (DSR) test. The pyrolysis and combustion characteristics of ATH/OMMT modified asphalt were analyzed by thermogravimetric (TG) test. The results reveal that ATH/OMMT composite flame retardant increases the softening point and reduces the low temperature performance of SBS modified asphalt. However, the flame retardant and smoke suppression performance are greatly enhanced by the additive of ATH/OMMT composite flame retardant. The initial decomposition temperature of the composite modified asphalt is 3 ℃ to 6 ℃ higher than that of SBS modified asphalt. When the ATH content is 10% (mass fraction) and the OMMT-C content is 3% (mass fraction), LOI value of asphalt is more than 23%. At the same time, the smoke density of asphalt is reduced by 33.9%. Compared with SBS modified asphalt, the decomposition residual rate of composite modified asphalt increases up to 61.3%. ATH/OMMT-C composite flame retardant significantly increases the complex modulus and rutting factor, and improves the deformation resistance of asphalt at high temperature.

Key words: aluminum hydroxide, organic montmorillonite, flame retardant and smoke suppression performance, rheological property, comprehensive index method, thermogravimetric test

CLC Number:

U414

JIA Xiaojun, SHEN Aiqin, WANG Chao, GUO Yinchuan, WANG Han, YANG Xiaolong, WU Hansong. Properties of Asphalt Modified by Aluminum Trihydrate/Organic Montmorillonite Composite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4167-4177.

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