改性稻草秸秆纤维水泥砂浆导热和耐久性能研究  

Thermal conductivity and durability of modified rice straw fiber cement mortar

作　　者：周乃辉 姜宝石[1] Zhou Naihui;Jiang Baoshi(School of Civil Engineering and Architecture,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学土木建筑工程学院,海南海口570228

出　　处：《海南大学学报（自然科学版）》2024年第2期208-217,共10页Natural Science Journal of Hainan University

基　　金：国家重点研发项目(2019YFD1101003)。

摘　　要：采用氢氧化钠(NaOH)浸泡预处理稻草秸秆纤维制备了改性稻草秸秆纤维水泥砂浆,分析不同纤维长度和纤维掺量的水泥砂浆的力学性能,研究了用改性稻草秸秆纤维水泥砂浆制成的薄板的导热性和耐久性.研究结果表明:稻草纤维削弱了水泥砂浆的抗折强度和抗压强度,但降低了水泥砂浆薄板试件的导热系数和密度,当纤维掺量为60%时,薄板的导热系数仅为0.128 W·(m·K)^(-1),显著提高了保温隔热性能.经加速老化后,薄板试件的抗折强度有不同程度的降低,但低于45%纤维掺量的试件仍能满足纤维水泥板R1级的强度要求.In the report,the modified rice straw fiber cement mortar was prepared by pretreating rice straw fibers with sodium hydroxide soaking,and the mechanical properties of cement mortar with different fiber lengths and fiber content were analyzed.The thermal conductivity and durability of the thin plates made of modified rice straw fiber cement mortar were also studied.The results showed that the straw fibers weaken the flexural and compressive strength of the cement mortar,however,the thermal conductivity and density of the cement mortar thin plate specimens are reduced.When the fiber content was 60%,the thermal conductivity of the thin plate was only 0.128 W∙(m·K)^(-1),which greatly improve the thermal insulation performance.After accelerated aging,the flexural strength of the thin plate specimens are reduced with varying degrees.However,the specimens with a fiber content lower than 45%can still meet the strength requirements of fibre cement board grade R1.

关 键 词：稻草秸秆纤维水泥砂浆 力学性能 导热性能 耐久性 

分 类 号：TU528.58[建筑科学—建筑技术科学]