抗剥落剂对沥青混合料水稳定性影响研究

Study on the Effect of Anti-spalling Agent on Water Stability of Asphalt Mixture

为改善沥青混合料水稳定性,采用消石灰和水泥两种抗剥落剂改良沥青混合料,并通过室内试验研究抗剥落剂对沥青混合料水稳定性影响规律。结果表明,掺抗剥落剂的沥青混合料抗水损害能力提高,抗剥落剂掺量每增加1%,沥青混合料冻融劈裂抗拉强度比降低不超过2.6%;消石灰掺量1%时,沥青混合料残留稳定度最大,较未掺抗剥落剂的沥青混合料残留稳定度提高11.4%以上;抗剥落剂可减小沥青混合料浸水飞散损失,抗剥落剂掺量≥1%时,石灰和水泥掺量增加1%,沥青混合料浸水飞散损失分别平均增大9.5%、9.6%。

In order to improve the structural water stability of the asphalt mixture,the asphalt mixture was improved by two anti-spalling agents of lime and cement,and the influence of the anti-spalling agent on the water stability of the asphalt mixture was studied through indoor experiments.The results show that the water damage resistance of asphalt mixtures mixed with anti-spalling agents under freezethaw conditions is improved,and the tensile strength ratio of asphalt mixtures with anti-spallant dosage of 1%is significantly improved.The residual stability of the asphalt mixture is the largest when the amount of lime is 1%or 2%of the cement mixture,and the residual stability of the asphalt mixture is increased by more than 9.2%compared with the residual stability of the asphalt mixture without anti-spalling agent;Anti-spalling agent can reduce the loss of water immersion and scattering of asphalt mixture,when the amount of anti-spalling agent is≥1%,the amount of lime and cement is increased by 1%,and the loss of water immersion of asphalt mixture is increased by an average of 9.5%and 9.6%,respectively.