Effect of Aging on the Viscoelastic Mechanical Properties of Cement/Emulsified Asphalt Composite Repair Material

Li, Yunliang; Fu, Yubo; Tian, Chengyu; Li, Xu; Tan, Yiqiu

doi:10.1520/jte20220024

Cited by 1 publication

(1 citation statement)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, MPC has a better compatibility with concrete [16], a lower coefficient of linear expansion, better stability under temperature changes, and a shorter setting time. For damage to concrete structures and hot-mix asphalt pavements, the usual repair materials used are polymer mortar and ordinary silicate cement (OPC) [5,17], but these materials are temperature-sensitive and, thus, degrade. The addition of silica powder to concrete can improve both water and corrosion resistance [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Modified Magnesium Oxide on the Properties of Magnesium Phosphate Cement under a Negative Temperature Environment

Luo

Lai

et al. 2022

Materials

View full text Add to dashboard Cite

As a rapid repair material, magnesium phosphate cement (MPC) can be used under various environmental temperature conditions, but different temperatures significantly impact its strength and working performance. In this study, based on the surface modification of magnesium oxide, the working and mechanical properties of samples were investigated at an ambient temperature of −5 °C, and the hydration properties and microstructure of MPC were investigated using X-ray diffraction (XRD), thermogravimetric analysis (TG), mercury-in-pressure (MIP), and scanning electron microscopy (SEM). The results show that the modified magnesium oxide at a negative temperature prolongs the setting time of MPC from 10 min to more than 30 min, and fluidity can still be maintained or increased after half an hour. From 1 d to 28 d, the compressive strength growth rate of the reference group was 257.0% compared to 723.8% for the 10 wt% water-glass-modified MgO sample. K-struvite transformed from a blocky growth to a needle-like growth with the modified sample filling the pores and cracks inside the matrix. Compared with the unmodified sample, MPC’s porosity decreased from 9.62% to 9.23% for 10 wt% water-glass-modified MgO. Therefore, the surface modification of magnesium oxide not only prolonged the setting time but also further benefited mechanical performance, which provides the prerequisites for MPC construction in negative-temperature environments.

show abstract

Section: Introductionmentioning

confidence: 99%