文档介绍：2013毕业论文
纤维掺量对混凝土抗压性能的影响研究
专业___无机非金属材料工程____
学生
指导教师
摘要
纤维可有效改善混凝土的性能,在素混凝土基体中掺入均匀分散的短纤维使其具有优良的抗拉、抗弯、抗疲劳、抗冲击性能以及耐磨耗、韧性高等特点。为了分析聚丙烯纤维掺量对混凝土抗压强度的影响,对水泥、石子、砂子等原材料进行了性能检测实验,并运用正交试验方法在纤维长度、纤维掺量、粉煤灰掺量、减水剂掺量等影响因素下对聚丙烯纤维混凝土的28天抗压性能的影响作了分析。实验结果表明:聚丙烯纤维的掺入可以有效改善新拌混凝土的和易性,能够增强混凝土试件的外观质量,减少试件表面蜂窝、麻面、气孔、细小裂纹,同时聚丙烯纤维还可以明显改善混凝土试件的破坏形态,使试件裂而不碎。纤维掺量对混凝土的抗压强度随着纤维掺量的提高而降低,%%%,%%%。纤维长度因素影响抗压强度最明显;纤维掺量﹑粉煤灰掺量等因素影响抗压强度较明显;减水剂掺量对抗压强度影响不太明显。
关键词:聚丙烯纤维;抗压强度;混凝土;纤维掺量
Abstract
Fiber can effectively improve the performance of concrete, the concrete matrix mixed with short fiber uniformly dispersed so that it has an excellent tensile, bending resistance, fatigue resistance, impact resistance, high toughness and wear characteristics. In order to analyze the influence of polypropylene fiber pressive strength of concrete, the performance experiments of cement, gravel, sand and other raw materials, and the use of orthogonal test method in fiber length, fiber volume fraction, the amount of fly ash, the amount of super plasticizer and other constraints of polypropylene fiber concrete 28 pressive the performance is analyzed. The experimental results show that: the addition of polypropylene fiber can effectively improve the workability of fresh concrete, can enhance the appearance quality of concrete, reduce the specimen surface, and the cellular, holes, small cracks, and polypropylene fiber can also improve the concrete failure mode of specimens, the specimens cracked but not broken. pressive strength of fiber content on concrete decreases with the increase of the content of fiber, fiber volume fraction of % concrete were % lower than pressive strength of the fiber content of % concrete, fiber volume fraction of % concrete were % lower than pressive strength of the fiber content of % concrete.. The most obvious influencing factors pressive strength of fiber length; compressive strength of fi