可再分散沥青粉末改性水泥砂浆性能试验研究

摘要

The influences of different dosages of redispersible asphalt powder on the strength,water absorption, shrinkage and pore structure of cement mortar were studied. The test results show that,when the content of asphalt powder does not exceed 30% of the total amount of cementitious materials of cement mortar,with the increase of asphalt powder content,the compressive strength,flexural strength and elastic modulus of mortar decrease,the ratio of flexural strength to compressive strength increases,the toughness increases and the ratio of shrinkage decreases. The incorporation of asphalt powder changes the pore structure of the mortar.With the increase of asphalt powder content,the total porosity of mortar increases.Due to the hydrophobic effect of asphalt,the water absorption of asphalt-blended mortar is lower than that of asphalt-free mortar.%研究了可再分散沥青粉末掺量对水泥砂浆的强度、吸水率、收缩性能以及孔结构的影响.试验结果表明:当沥青粉末掺量不超过水泥砂浆胶凝材料总量的30%时,随着沥青粉末掺量的增加,砂浆的抗压强度、抗折强度、弹性模量均降低,砂浆的折压比增大,韧性提高,收缩率减小;沥青粉末的掺入改变了砂浆的孔结构,随着沥青粉末掺量的增加,砂浆的总孔隙率增加;由于沥青的憎水作用,掺沥青粉末砂浆的吸水率比不掺沥青粉末砂浆的吸水率低.