碱处理稻草纤维对透水再生混凝土力学性能的影响及路用实践  

Influence of alkali treated straw fiber on pavement performance of pervious recycled concrete and its practice

作　　者：邓翀 DENG Chong(CCCC Wuhan Harbour Engineering Design and Research Co.Ltd.,Wuhan 430040,China;Hubei Key Laboratory of Advanced Materials and Reinforcement Technology Research for Marine Environment Structures,Wuhan 430040,China;CCCC SHEC Wuhan Harbour New Materials Co.Ltd.,Wuhan 430040,China)

机构地区：[1]中交武汉港湾工程设计研究院有限公司,湖北武汉430040 [2]海工结构新材料及维护加固技术湖北省重点实验室,湖北武汉430040 [3]中交二航武汉港湾新材料有限公司,湖北武汉430040

出　　处：《新型建筑材料》2023年第7期60-65,共6页New Building Materials

基　　金：湖北省重点研发计划项目(2020BAB071)。

摘　　要：采用NaOH溶液对稻草纤维进行改性,研究NaOH溶液浓度及浸泡时间对改性稻草纤维性能的影响,确定最佳改性方案;在此基础上研究了改性稻草纤维掺量及纤维形态对透水再生混凝土透水系数、力学性能以及抗冻性能的影响,并在试验路段进行铺设。结果表明,NaOH溶液的最佳浓度为4%,最佳浸泡时间为12 h。随改性稻草纤维掺量增加,透水再生混凝土的透水系数有所增大,其中丝状改性稻草纤维掺量为4.8 kg/m^(3)时透水系数达到最大,为8.22 mm/s;透水再生混凝土的抗压强度呈下降趋势,而劈裂抗拉强度、拉压比和抗冻性能均有所提高。试验路段验证了透水再生混凝土的强度和透水性能的整体效果良好。The rice straw fiber was treated with NaOH solution,and the properties of modified rice straw fiber were studied under different NaOH solution concentrations and different soaking times,and the optimal pretreatment scheme was determined.On this basis,the influence of content and morphology of modified rice straw fiber on the permeability coefficient,mechanical properties and frost resistance of pervious recycled concrete was studied,and it was laid in the experimental section.The test results show that the optimal concentration of NaOH solution is 4%,and the optimal soaking time is 12 h.With the increase of the content of modified rice straw fiber,the permeability coefficient of pervious recycled concrete is increased,and the maximum permeability coefficient is 8.22 mm/s when the content of modified rice straw fiber is 4.8 kg/m^(3).The compressive strength of pervious recycled concrete shows a downward trend,while the splitting tensile strength,tension compression ratio and frost resistance are all improved.Finally,the overall effect of strength and water permeability is verified in the test pavement.

关 键 词：透水再生混凝土 稻草纤维 强度 透水性能 抗冻性能 路用性能 

分 类 号：TU528.2[建筑科学—建筑技术科学]