砂浆施工性能影响因素

In order to gain a thorough understanding on factors influencing construction performance of CRTS-Ⅱ-type cement asphalt(CA) mortar and the impact on compression strength posed by the resulting constructiton performance, orthogonal experimental design was adopted to study the construction performance and 28d compressive strength of CA mortar by changing the ratio of water to cement, defoamer and superplasticizer dosage. And relationships among various construction performances and their effect on compression strength of CA mortar were discussed on the base of test results. Results show that defoamer dosage is the major factor that impacts CA mortar's gas content. For the working hours of CA mortar, superplasticizer dosage is experimentally demonstrated as the major factor. Defoamer, superplasticizer dosage, and the ratio of water to cement all can affect CA mortar's liquidity, with descending order of importance. The separation and bleeding phenomenon have some relationship with liquidity and gas content in CA mortar. Flowability has positive correlation with gas content in CA mortar: the worse liquidity, the more gas content. 28d compressive strength of CA mortar decreases with the increase of gas content. Through changing the ratio of water to cement, defoamer and superplasticizer dosage to make construction performance of CA mortar meet requirements maintain and stable serves as the research foundation of CA mortar mix proportion design and mechanics properties investigation.