水泥夯土材料抗压强度试验及耐久性研究

Experimental Study on Compressive Strength and Durability of Rammed Cement Soil Materials

为研究水泥改性夯土材料的力学性能,依据粒径和水泥含量不同制备了8种试件,在不同养护环境下养护5年后,对其进行抗压强度试验和表观耐久性评估,探究不同粒径和水泥含量对抗压强度和表观耐久性的影响。结果表明:水泥夯土材料强度与含水率、粒径分布、水泥掺量、养护方法和放置年限等因素相关;随时间积累试件抗压强度不断增加,但28 d室外养护试件强度显著下降;水泥掺量越大抗压强度就越大,室内养护试件强度大于室外养护试件强度;不添加砾石的试件表观耐久性优良,砾石掺量过高试件表观较差。

In order to study the mechanical properties of cement-modified rammed earth materials,8 specimens were prepared according to different particle size and cement content.After 5 years of curing under different curing environments,compressive strength test and apparent durability evaluation were carried out to explore the effects of dfferent particle size and cement content on compressive strength and apparent durability.The results show that the strength of cement rammed earth is related to water content,particle size distribution,cement content,curing method and placement time.The compressive strength of the specimen increased with time accumulation,but the strength of the specimen under outdoor curing for 28 days decreased significantly.The greater the cement content,the greater the compressive strength,and the strength of indoor curing specimen is greater than that of outdoor curing specimen.The apparent durability of the specimen without gravel is good,but the appearance of the specimen with high grave content is poor.