Experimental study and isolation mechanism analysis on emulsion wax curing agent used on cement-stabilized granular base

Based on the analysis in the mechanism of emulsion wax curing agent (EWCA) which was regarded as bond-breaking layer of concrete pavement, tests for shear stress, penetration test, pendulum friction coefficient test and sliding friction coefficient test are operated. Indexes for tests are measured after the spraying of EWCA on cement-stabilized granular base (CSGB). Compared with base do not have bond-breaking layer, test results indicated that bond stress, friction coefficients and permeability coefficients had been separately reduced by 64, 62 and 9 % with the help of EWCA. As a result it will improve the impermeability of CSGB. Pendulum friction coefficient test and sliding friction coefficient test are conducted, on cement-stabilized base’s surface with different texture depth 3 days after the spraying of EWCA. According to variation of sliding friction coefficient and British Pendulum Number (BPN), it can be concluded that they will decrease as increasing of spraying dosage and tend to stable finally. Field interlayer tangential bond force test with EWCA being sprayed on lean concrete base (texture depth <0.3) is performed. The results indicates: spraying time has significant effect on jacking force; wearing after form the film and rainfall have less effect on jacking force. The experimental results indicate that longer the time interval (from spraying the EWCA to pouring the pavement), the worse the effect of isolation. As a conclusion of engineering, the construction of isolation layer should be finished a few days before the construction of pavement.