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剑麻纤维水泥混凝土(路面)配合比试验研究

发布时间:2018-07-14 10:37
【摘要】:在水泥混凝土中添加纤维材料以提高其工作性能,是建筑材料研究的一个全新领域。目前国内研究的掺入纤维种类分为两大块:合成纤维和矿物纤维,但国外学者已开始尝试以植物纤维增强水泥混凝土性能,获得绿色环保性能优越的经济型纤维水泥混凝土。剑麻纤维具有质地坚硬富有弹性耐摩擦耐低温拉伸强度高等特点,此外,还具有纤维长度大色泽洁白耐海水腐蚀等诸多特性。 本文依据已确定试配抗折强度、水灰比、砂率、单位用水量及砂石用量等主要实验参数,开展实验室试验确定剑麻纤维掺量、水灰比及砂率等因素对混凝土工作性及各项路用性能的影响,并测定其抗折性能、劈裂抗拉性能等来确定实验室最佳配合比。通过实验室最佳配合比进行工程试验强度的试配,结合施工现场原材料性能指标,工程配合比参数修正,通过在试验路段的现场路面摊铺施工,获得工程最佳配合比。 通过大量的室内试验及工程试验,并结合在湖北省黄冈市某城市道路路面上的实际工程试验,确定了剑麻纤维混凝土的施工工艺及技术要求。研究结果表明,使用HQ-UNF萘系减水剂时宜采用干法搅拌工艺;水灰比最佳范围为0.33~0.36,砂率优选范围为0.35~0.37;工程施工最佳设计配合比为:水泥:水:砂:碎石:剑麻:减水剂=1:0.340:1.343:2.501:0.010:0.025;剑麻纤维的最佳质量掺量为0.19%。与其他纤维混凝土进行对比,剑麻纤维水泥混凝土配合比中的单位水泥用量较少,,抗折强度以及抗压强度有很大提高,能够使混凝土的整体性能得到提高,且成本与聚丙烯纤维混凝土对比降低约5.6%,因此具有很好的经济性和应用前景。
[Abstract]:Adding fiber material to cement concrete to improve its working performance is a new research field of building materials. At present, the kinds of blended fibers studied in China are divided into two parts: synthetic fiber and mineral fiber, but foreign scholars have begun to try to enhance the performance of cement concrete with plant fiber to obtain green? Environmental protection Superior performance of economic fiber cement concrete. Is sisal fiber hard? Elastic? Friction? Low temperature? High tensile strength and other characteristics, in addition to the fiber length is large? White? Resistance to seawater corrosion and many other characteristics. Based on the main experimental parameters, such as the bending strength, water-cement ratio, sand ratio, unit water consumption and the amount of sand and stone, the content of sisal fiber was determined by laboratory tests. The effects of water-cement ratio and sand ratio on the workability and road performance of concrete were studied. The best mixture ratio was determined by measuring the flexural and splitting tensile properties of concrete. The optimum mix ratio is obtained through the construction of the site pavement in the test section through the laboratory optimum mix ratio for the test strength of the engineering test, combined with the performance index of the raw materials in the construction site and the modification of the parameters of the engineering mix ratio. The construction technology and technical requirements of sisal fiber concrete are determined through a large number of indoor and engineering tests and combined with the actual engineering tests on a certain city road pavement in Huanggang City Hubei Province. The results show that dry mixing process is suitable for the use of HQ-UNF naphthalene series water reducer, the optimum range of water-cement ratio is 0.33 ~ 0.36, and the optimum selection range of sand ratio is 0.35 ~ 0.37. The optimum design mix ratio of engineering construction is as follows: cement: water: sand: gravel: sisal: water reducer 1: 0.340: 1.343: 2.501: 0.010: 0.025; the optimum mass ratio of sisal fiber is 0.19. Compared with other fiber reinforced concrete, the content of unit cement in the mix ratio of sisal fiber cement concrete is less, the flexural strength and compressive strength are greatly improved, and the overall performance of concrete can be improved. Compared with polypropylene fiber concrete, the cost is reduced by 5. 6%, so it has good economy and application prospect.
【学位授予单位】:武汉工程大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:U416.216

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