工业固废固化剂稳定土施工耐候性及耐久性

Construction Weather Resistance and Durability of Industrial Solid Waste Curing Agent Stabilized Soil

为评价工业固废固化剂稳定土工程适用性,对比分析工业固废固化剂稳定土和水泥稳定土施工耐候性及耐久性,通过延迟成型和环境控制箱模拟现场不利施工环境,测试不同条件下2种稳定土无侧限抗压强度,并对比2种稳定土的干缩、温缩和疲劳性能。结果表明,与未延迟成型相比,工业固废固化剂稳定土强度延迟成型24 h内时,强度均增加,仍能满足工程应用要求;水泥稳定土延迟成型8 h时,强度不满足工程应用要求。10℃以上养生或经受冻融循环前,稳定土正常养生4 d以上时,2种稳定土强度可满足要求。与水泥稳定土相比,工业固废固化剂稳定土低温和冻融循环条件下无侧限抗压强度提高10%~20%;30 d龄期时干缩系数降低约16%;0~40℃范围内平均温缩系数降低约30%;0.5和0.6应力比时,不同保证率下稳定土疲劳寿命提高10%~20%。

In order to evaluate the engineering applicability of industrial solid waste curing agent stabilized soil and compare the construction weather resistance and durability of stabilized soil by industrial solid waste curing agent and cement respectively,the adverse construction environment on site was simulated by delayed molding and environmental control box,the unconfined compressive strength of the two stabilized soils with different conditions were tested,and the dry shrinkage,temperature shrinkage and fatigue properties of the two stabilized soils were compared.The results show that compared with non-delayed molding,the strength of stabilized soil by industrial solid waste curing agent increases within 24 h of delayed molding,which can still meet the requirements of engineering application.The strength of cement stabilized soil cannot meet the requirements of engineering application when forming is delayed for 8 h.The strength of the two stabilized soils can meet the requirements when curing above 10℃or the stabilized soil can be cured normally for 4 d before undergoing freezing and thawing cycles.Compared with the cement stabilized soil,the unconfined compressive strength of the soil stabilized by industrial solid waste curing agent increases by about 10%~20%under the conditions of low temperature and freeze-thaw cycles.At 30 d age,the shrinkage coefficient decreases by about 16%.The average temperature shrinkage coefficient in the range of 0~40℃decreases by about 30%.When the stress ratio is 0.5 and 0.6,the fatigue life of stabilized soil increases by 10%~20%under different assurance rates.