黄麻纤维增强偏高岭土水泥砂浆性能研究

Research on the Performance of Jute Fiber Reinforced Metakaolin Cement Mortar

掺入纤维是改善水泥基材料脆性,提高其强度和韧性的常用手段。将黄麻纤维掺入水泥基砂浆,制备黄麻纤维增强水泥砂浆(JFRC),研究黄麻纤维掺量和长度对砂浆抗压强度、抗折强度和劈裂抗拉强度的影响。考虑到植物纤维在高碱性基体环境中易腐蚀失效,采用偏高岭土部分替代水泥以降低基体碱度。结果显示,JFRC的抗压强度、抗折强度、劈裂抗拉强度随着黄麻纤维掺量和长度的增大均呈现先增大后减小的趋势,黄麻纤维最佳掺量为0.75%,最佳长度为10 mm,加入适量的处理过的黄麻纤维可以很好地改善水泥砂浆的力学性能和韧性;采用最佳掺量时,JFRC的单位强度碳排放量和成本分别降低了21.48%和19.16%。研究结果表明,JFRC是一种具有较高环境效益和经济效益的植物纤维增强材料。

Incorporating fibers is a common method to improve the brittleness of cement-based materials and enhance their strength and toughness.Jute fiber reinforced cement mortar(JFRC)was prepared by adding jute fiber into cement-based mortar.The effects of the dosage and length of jute fiber on the compressive strength,flexural strength and splitting tensile strength of mortar were studied.Considering that plant fiber is easy to corrode and fail in high alkaline matrix environment,metakaolin is used to partially replace cement to reduce matrix alkalinity.The results show that the compressive strength,flexural strength and splitting tensile strength of JFRC increase at first and then decrease with the increase of jute fiber dosage and length.The optimum dosage of jute fiber is 0.75% and the optimum length is 10 mm.Adding proper amount of treated jute fiber can improve the mechanical properties and toughness of cement mortar.When the optimum dosage is adopted,the carbon emission per unit strength and cost of JFRC are reduced by 21.48% and 19.16% respectively.The research results indicate that JFRC is a plant fiber reinforcement material with high environmental and economic benefits.