高强度聚丙烯纤维泡沫混凝土的制备及抗蚀性能分析  

Preparation of high-strength polypropylene fiber foam concrete andanalysis of its corrosion resistance

作　　者：任大鹏 姜洋 REN Dapeng(Applied Technology College of Dalian Ocean University,Dalian 116300,China)

机构地区：[1]大连海洋大学应用技术学院,辽宁大连116300 [2]不详

出　　处：《功能材料》2023年第10期10200-10206,共7页Journal of Functional Materials

基　　金：国家自然科学基金(61802046);辽宁省教育厅科学研究经费项目(QL202017)。

摘　　要：以P.O 42.5普通硅酸盐水泥和十二烷基硫酸钠发泡剂为基体材料,聚丙烯纤维为掺杂相,制备了不同纤维掺杂量的泡沫混凝土,研究了聚丙烯纤维掺杂量对泡沫混凝土力学性能、收缩性能、导热性能和抗蚀性能的影响。结果表明,适量聚丙烯纤维的掺杂改善了泡沫混凝土的气孔均匀性,使气孔尺寸变小,连通孔和大孔数量减少,纤维穿插于混凝土水化产物之间,与浆体结合紧密。适量聚丙烯纤维的掺杂有效抑制了泡沫混凝土的开裂和收缩,提升了其导热性能和抗蚀性能。随着聚丙烯纤维掺杂量的增加,泡沫混凝土的抗压强度、抗折强度和劈裂抗拉强度均先增大后减小,吸水率、收缩率、导热系数和氯离子迁移系数则先降低后升高。养护28 d龄期下,当聚丙烯纤维的掺杂量为0.9%(质量分数)时,泡沫混凝土的抗压强度、抗折强度和劈裂抗拉强度达到最大值,分别为4.49,1.53和1.03 MPa;吸水率、收缩率、导热系数和氯离子迁移系数达到最低值,分别为0.2841%,1.121%,0.103 W/(m·K)和8.1×10^(-12)m^(2)/s。综合可知,聚丙烯纤维的最佳掺杂量为0.9%(质量分数)。With P.O 42.5 ordinary Portland cement and sodium dodecyl sulfate foaming agent as matrix materials and polypropylene fiber as doping phase,foam concrete with different fiber doping amounts was prepared.The influence of polypropylene fiber content on the mechanical properties,shrinkage properties,thermal conductivity and corrosion resistance of foam concrete was studied.The results showed that the proper amount of polypropylene fiber could improve the uniformity of the pores of foam concrete,reduced the size of the pores,reduced the number of connected pores and large pores,and the fibers were interspersed between the concrete hydration products and closely combined with the slurry.The appropriate amount of polypropylene fiber could effectively inhibit the cracking and shrinkage of foam concrete,and improved its thermal conductivity and corrosion resistance.With the increase of polypropylene fiber content,the compressive strength,flexural strength and splitting tensile strength of foam concrete first increased and then decreased,while the water absorption,shrinkage,thermal conductivity and chloride ion migration coefficient first decreased and then increased.At the age of 28 d,when the polypropylene fiber content was 0.9 wt%,the compressive strength,flexural strength and splitting tensile strength of foam concrete reached the maximum values of 4.49,1.53 and 1.03 MPa respectively,and the water absorption,shrinkage,thermal conductivity and chloride ion migration coefficient reached the lowest values,which were 0.2841%,1.121%,0.103 W/(m·K)and 8.1×10^(-12)m^(2)/s respectively.In conclusion,the optimum doping amount of polypropylene fiber is 0.9 wt%.

关 键 词：聚丙烯纤维 泡沫混凝土 力学性能 收缩性能 导热性能 抗蚀性能 

分 类 号：TU528.2[建筑科学—建筑技术科学]