纤维改性坝体地聚合物混凝土性能研究  

Study on the Properties of Geopolymer Concrete for Fiber-Modified Dam Body

作　　者：王婷 刘晓鹏 WANG Ting;LIU Xiao-peng(Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221000,Jiangsu,China;Construction Branch,State Grid Chongqing Electric Power Company,Chongqing 400047,China)

机构地区：[1]江苏建筑职业技术学院,江苏徐州221000 [2]国网重庆市电力公司建设分公司,重庆400047

出　　处：《合成纤维》2025年第3期78-81,87,共5页Synthetic Fiber in China

基　　金：微小芯样法评定混凝土抗压强度技术应用研究(JYA322-01);小芯样检测混凝土抗压强度应用研究(KC22307)。

摘　　要：为了寻求更加绿色环保的混凝土材料,成功制备了矿渣-粉煤灰基坝体地聚合物混凝土,分别掺加钢纤维、聚丙烯(PP)纤维与聚酰胺(PA)纤维对其进行增韧改性。通过力学性能试验和干燥收缩试验,探究三种纤维对矿渣-粉煤灰基坝体地聚合物混凝土的影响机制。结果表明:钢纤维可以有效提高地聚合物混凝土的强度,同时降低其干燥收缩率,但当掺入体积分数提高时,其抗折强度、劈裂抗拉强度呈现出不同的下降趋势;PA纤维的掺入会导致地聚合物混凝土的抗压强度、抗折强度与劈裂抗拉强度均有小幅度提升,且干燥收缩率同样低于对照组,体积分数增加时,抗折强度与劈裂抗拉强度提升更加明显;PP纤维的掺入使得地聚合物混凝土的强度有所提高。在相同的掺入体积分数条件下,钢纤维表现出最优的增韧改性效果,PA纤维次之,PP纤维表现最差。In order to find a more green and environmentally friendly concrete material,slag-fly ash-based dam geopolymer concrete was successfully prepared,and steel fiber,polypropylene(PP)fiber and polyamide(PA)fiber were added to toughen and modify it.Through mechanical property tests and drying shrinkage test,the influence mechanism of three types of fibers on slag-fly ash-based dam geopolymer concrete was explored.The results show that steel fiber can effectively improve the strength of geopolymer concrete and reduce its dry shrinkage.However,when the volume fraction is increased,its flexural strength and splitting tensile strength show different downward trends.The addition of PA fiber leads to a small increase in com⁃pressive strength,flexural strength and tensile strength of geopolymer concrete,and the dry shrinkage rate is also lower than that of the control group.When the volume fraction is increased,the flexural strength and splitting tensile strength will increase more significantly.The addition of PP fiber improves the strength of geopolymer concrete.Under the same volume fraction conditions,steel fiber shows the best toughening and modification effect,follows by PA fiber,and PP fiber performs the worst.

关 键 词：聚酰胺纤维 聚丙烯纤维 地聚合物 力学性能 干燥收缩 

分 类 号：TQ342.62[化学工程—化纤工业] TU455[建筑科学—岩土工程]