Research on factors influencing mechanical properties of high strength cement asphalt mortar and mechanical mechanism

In order to understand the influence of the main component materials of high strength CA mortar on the mechanical properties, the influence of changes of the mass ratio of asphalt emulsion to cement(m_A/m_C) and the mass ratio of sand to cement(m_S/m_C) on the strength and elasticity modulus was studied. In order to analyze the microcosmic mechanism of mechanical properties of CA mortar, the cement asphalt gel microstructure and interface between CA mastic and sand in CA mortar were observed by the scan electron microscopy. Results show as follows: The axial compressive strength and elasticity modulus of CA mortar decline dramatically with the increase of m_A/m_C; along with increasing of m_S/m_C, the elasticity modulus of CA mortar changes little, while the 28 d axial compressive strength changes little at first and then declines sharply; the cement asphalt gel microstructure characters and interface bonding between CA mastic and sand in CA mortar determine the mechanical characteristics of CA mortar. The appropriate m_A/m_C and good flow properties are the guarantee of good mechanical properties of CA mortar.