竹原纤维再生骨料混凝土配制与性能研究  

Research on the preparation and performance of bamboo fiber recycled aggregate concrete

作　　者：王莹[1] 徐彬妤 张振文[1] 章子华[1] WANG Ying;XU Binyu;ZHANG Zhenwen;ZHANG Zihua(School of Civil and Environmental Engineering and Geography Science,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学土木工程与地理环境学院,浙江宁波315211

出　　处：《混凝土》2024年第4期166-170,177,共6页Concrete

基　　金：国家自然科学基金(51708304);宁波市公益性科技计划项目(2022S171);浙江省新苗人才计划(2023R405076)。

摘　　要：通过正交试验研究竹原纤维掺量、竹原纤维长度和水灰比对混凝土抗压强度、劈裂抗拉强度、抗弯强度和坍落度的影响,得出竹原纤维混凝土的最佳配合比。并将天然骨料全部替换为再生骨料,采用扫描电子显微镜对竹原纤维在混凝土内的作用机理进行了研究分析。试验结果表明:掺竹原纤维受压试件破坏时具有良好的整体性,纤维在混凝土内部起到了一定的拉结作用;竹原纤维混凝土的最优配合比为竹纤维长度20 mm、竹纤维掺量4 kg/m^(3)、水灰比0.55;竹原纤维-硬化水泥浆体界面过渡区内几乎没有片状的Ca(OH)_(2)晶体,纤维与水泥浆体的界面黏结良好。Through orthogonal experiments,the effects of bamboo fiber content,bamboo fiber length,and water cement ratio on the compressive strength,splitting tensile strength,flexural strength,and slump of concrete were studied,and the optimal mix ratio of bamboo fibril concrete is obtained.The natural aggregate was replaced by recycled aggregate,and the mechanism of bamboo fiber in concrete was studied and analyzed by using scanning electron microscope.The experimental results show that the compressive specimens mixed with bamboo fiber exhibit good integrity when the specimens are damaged,and the fiber plays a certain role in the internal tension of the concrete.The optimal ratio of bamboo fiber reinforced concrete is 20 mm of bamboo fiber length,4 kg/m^(3) of bamboo fiber content,and 0.55 of water cement ratio.There are almost no flaky Ca(OH)_(2) crystals in the interface transition zone between bamboo fiber and hardened cement paste,and the interface between fibers and cement paste is well bonded.

关 键 词：竹原纤维 再生混凝土 正交试验 微观结构 

分 类 号：TU528.062[建筑科学—建筑技术科学]