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处于高海拔常年低温的G219新藏公路,水泥稳定基层铺筑完成后10～15天才能取出芯样,铺筑沥青混凝土后的反射裂缝较多。为此,本研究在水泥稳定基层中添加了SES-Ⅰ低温早强剂,通过降低水的冰点、表面能与液相粘度,增加水泥水化结晶的晶胚生成速度等,达到在低温条件下提高水泥稳定基层的强度;生成少量有一定膨胀性的钙矾石等措施,提高基层抗裂性能。G219新藏公路现场试验结果表明,添加SES-Ⅰ低温早强剂后的水泥稳定基层在2～3天即可取出完整芯样,后期基层抗裂性能优良,具有推广应用价值。
G219 in the high altitude perennial low Tibetan highway, cement stabilized grassroots pavement after 10 to 15 days to remove the core sample, reflective asphalt pavement after more cracks. Therefore, in this study, SES-I low temperature early strength agent was added into the stable base of cement to reduce the water freezing point, the surface energy and the liquid viscosity, and the growth rate of the embryo of cement hydration crystallization, Improve the strength of the cement-stabilized grass-roots level; generate a small amount of ettringite with certain expansibility and improve the cracking resistance of the grass-roots level. G219 Xinzang highway field test results show that the addition of SES-Ⅰ low temperature early strength agent cement stabilized grassroots in 2 to 3 days to remove the complete core samples, the late grass-roots anti-cracking performance, and has the promotion and application value.