分步拌和抗裂型水泥稳定碎石强度和模量规律

安平¹，徐钦升^2*，丁伟¹，秦泗龙¹，闫翔鹏²

1.日照公路建设有限公司，山东 日照  276800；2.山东省交通科学研究院，山东 济南  250031

摘要：为解决水泥稳定碎石基层应用中出现裂缝和结构性破坏问题，通过无侧限抗压强度试验和抗压回弹模量试验，测试常规拌和工艺、分步拌和工艺及不同水泥质量分数的水泥稳定碎石混合料的无侧限抗压强度和抗压回弹模量，对比分析分步拌和抗裂型水泥稳定碎石的无侧限抗压强度和抗压回弹模量变化规律及新型拌和工艺对水泥稳定碎石材料性能影响。结果表明：2种拌和工艺所制水泥稳定碎石混合料的无侧限抗压强度和抗压回弹模量变化规律一致，均随水泥质量分数的增大而不断增大；相同水泥质量分数条件下，基于分步拌和工艺的水泥稳定碎石混合料的无侧限抗压强度和抗压回弹模量更大；在相同的无侧限抗压强度和抗压回弹模量要求下，分步拌和工艺水泥稳定碎石混合料的水泥用量减少，可缩减工程成本。

关键词：水泥稳定碎石；分步拌和；无侧限抗压强度；抗压回弹模量

Law of strength and modulus of crack resistant cement stabilized macadam by step mixing

AN Ping¹, XU Qinsheng^2*, DING Wei¹, QIN Silong¹, YAN Xiangpeng²

1.Rizhao Highway Construction Co., Ltd., Rizhao 276800 , China;2.Shandong Transportion Institution, Jinan 250031, China

Abstract:In order to solve the problem of cracks and structural damage in the application of cement-stabilized crushed stone base, the unconfined compressive strength test and compressive resilience modulus test were used to test the conventional mixing process, step-by-step mixing process and different cement mass fractions. Unconfined compressive strength, compressive rebound modulus,and effect of new mixing process on the properties of cement-stabilized crushed stone materials of cement-stabilized crushed stone mixture, is comparatively analyzed of the unconfined compressive strength and compressive rebound modulus of step-mixed crack-resistant cement-stabilized crushed stone. The results show that the change rules of unconfined compressive strength and modulus of cement-stabilized crushed macadam mixture prepared by two mixing processes are consistent, and both increase with the increase of cement mass fraction. With the same cement mass fraction, the unconfined compressive strength and modulus of the cement-stabilized crushed macadam mixture based on the step mixing process are greater. Cement stabilized crushed macadam mixture through step mixing process with less cement can match the same unconfined compressive strength and compressive rebound modulus requirements, thus reduce the engineering cost.

Keywords:cement stabilized crushed macadam; step mixing; unconfined compressive strength; compressive resilience modulus