Temperature Sensitivity of Mechanical Properties of Cement Asphalt Mortar with Nanoparticles

Abstract

Cement asphalt mortar (CAM) in high-speed lines is subjected to varying environmental conditions, which lead to the deterioration of CAM. e nanoparticles of nano-SiO 2 and nano-TiO 2 are added to improve the performance of CAM, and the temperature sensitivity of CAM with nanoparticles is primarily studied in this paper. e flexural strength and compressive strength of CAM with and without nano-SiO 2 and nano-TiO 2 were measured and compared to study the effect of nanoparticles on the performance of CAM subjected to different temperatures. Temperature sensitivity factors of flexural and compressive strength based on Arrhenius model were proposed to evaluate the temperature dependence of CAM by nanoparticles. Furthermore, the microstructure of hardened CAM was studied using scan electronic microscope (SEM) to investigate the mechanism of temperature sensitivity of CAM with and without nanoparticles. e results indicated that the flexural and compressive strength of CAM with and without nanoparticles decreased with the increasing temperature; however, the decreasing rate of strength with temperature was different in CAM with and without nanoparticles. e reduction in the decreasing rate of strength was obtained by using nano-SiO 2 rather than nano-TiO 2 in CAM. Based on the SEM results, the free asphalt was seen to be greatly reduced in the CAM with nano-SiO 2 , suggesting a positive effect of nano-SiO 2 on the mitigation of temperature sensitivity of CAM.

Research on Design and Performance of Self-Compacting Cement Emulsified Bitumen Mixture (CEBM)

“…On the other hand, the cementitious phase in the CEBM was dispersed within the emulsified bitumen. The cement hydration consumed a portion of the water that occupies the micro air void spaces between the emulsified bitumen and aggregate, which had a stiffening effect on emulsified bitumen [ 43 , 46 ]. The hydration products of the aggregate and cement, the skeleton function of the cement, and the encapsulation and adhesion function of the emulsified bitumen complement each other, and together with the hydration products of cement interweave with demulsified bitumen to enhance the overall stability and form the strength of CEBM.…”

A Review on Cement Asphalt Emulsion Mortar Composites, Structural Development, and Performance

“…Nanoparticles are among the useful additives with promising influence in improving the performance properties of CBM and bituminous mixtures. Nanoparticles such as nano-SiO 2 and nano-TiO 2 are broadly used to enhance the strength and durability of CBMs [78,79]. Previous researches showed that nanoparticles in CBMs could react with Ca(OH) 2 crystals and generate more C-S-H gel, which occupies the void spaces and enhances the density of the interfacial transition zone [80][81][82].…”

Environment Effect on the Rutting Resistance of Nano‐SiO2‐Modified Asphalt Concrete: Temperature and Water

“…Hasaninia and Haddadi investigated the rutting and fatigue damage of asphalt caused by nano-SiO 2 and found the correlation between modified binder and the engineering performance of asphalt mixture [13]. Wu et al explored the temperature sensitivity of nanoparticles to cement mortar, the influence of nano-SiO 2 on the strength of cement asphalt mortar, and the performance of nano-SiO 2 cement asphalt mortar at different temperatures [14]. Rezaei et al modified asphalt with nano-SiO 2 and SBS polymer and analyzed its hightemperature performance [15].…”