Effect of surface active agents on the rheological properties and solubility of layered double hydroxides-modified asphalt

摘要

Layered double hydroxides ( LDHs) modified asphalt is a typical solid-liquid mixture that is concentrated suspensions of solid particles in solutions. The influence of dodecyl benzenesulfonic acid (DBSA) and polyvinyl alcohol (PVA) on the rheological properties and solubility of LDHs modified asphalt (LMA) were investigated by dynamic shear rheometer, molecular dynamic simulations and optical microscopy. Research results indicated that the addition of DBSA or PVA to LDHs modified asphalt resulted in enhancement of the cracking resistance, stress relaxation and creep behavior at lower temperature. The solubility parameters of surface active agent and LMA showed that PVA and DBSA can contribute to the solution of LDHs in asphalt. The effect of PVA was better than DBSA. The morphology of LMA implied that the distribution of LDHs was uniform when 0.5wt-% DBSA or PVA were added and increasing DBSA contents under certain levels increased the uniformity of LDHs..