Properties of concrete incorporating high volumes of class F fly ash and san fibers
Properties of concrete incorporating high volumes of class F fly ash and san fibers
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DOI：
10.1016/s0008-8846(03)00192-3
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发表时间：
2004
影响因子：
11.4
通讯作者：
R. Siddique
中科院分区：
文献类型：
--
作者：
R. Siddique
介绍了用三种百分比的粉煤灰代替水泥（按质量）的效果以及添加天然纤维对粉煤灰混凝土的坍落度、Vebe 时间、抗压强度、劈裂拉伸强度、弯曲强度和冲击强度的影响的实验研究结果。桑纤维属于“天然韧皮纤维”的范畴。它也被称为“桑恩大麻”。它的学（植物学）名称是Crotalaria juncea。它主要种植在印度次大陆、巴西、东部和南部非洲以及美国的部分地区（夏威夷和佛罗里达）。设计了比例为 1:1.4:2.19、W/Cm 为 0.47、高效减水剂/水泥比为 0.015 的对照混合物。水泥被替换为三种百分比（35%、45% 和 55%）的 F 级粉煤灰。使用长度为 25 毫米的三种百分比的桑纤维（0.25%、0.50% 和 0.75%）。试验结果表明，用粉煤灰代替水泥提高了和易性（坍落度和维贝时间），降低了抗压强度、劈裂拉伸强度和弯曲强度，并且对普通（对照）混凝土的冲击强度没有显着影响。随着纤维百分比的增加，添加SAN纤维降低了粉煤灰混凝土的和易性，但对抗压强度没有显着影响，但增加了劈裂拉伸强度和弯曲强度，并极大地提高了粉煤灰混凝土的冲击强度。
The results of an experimental investigation to study the effects of replacement of cement (by mass) with three percentages of fly ash and the effects of addition of natural san fibers on the slump, Vebe time, compressive strength, splitting tensile strength, flexural strength and impact strength of fly ash concrete are presented. San fibers belong to the category of “natural bast fibers.” It is also known as “sunn hemp.” Its scientific (botanical) name is Crotalaria juncea. It is mostly grown in the Indian subcontinent, Brazil, eastern and southern Africa and some parts of the United States (Hawaii and Florida). A control mixture of proportions 1:1.4:2.19 with W/Cm of 0.47 and superplasticizer/cementitious ratio of 0.015 was designed. Cement was replaced with three percentages (35%, 45% and 55%) of class F fly ash. Three percentages of san fibers (0.25%, 0.50% and 0.75%) having 25-mm length were used. The test results indicated that the replacement of cement with fly ash increased the workability (slump and Vebe time), decreased compressive strength, splitting tensile strength and flexural strength and had no significant effect on the impact strength of plain (control) concrete. Addition of san fibers reduced the workability, did not significantly affect the compressive strength, increased the splitting tensile strength and flexural strength and tremendously enhanced the impact strength of fly ash concrete as the percentage of fibers increased.