【摘要】：在水泥混凝土中添加纖維材料以提高其工作性能，是建筑材料研究的一個全新領域。目前國內(nèi)研究的摻入纖維種類分為兩大塊：合成纖維和礦物纖維，但國外學者已開始嘗試以植物纖維增強水泥混凝土性能，獲得綠色環(huán)保性能優(yōu)越的經(jīng)濟型纖維水泥混凝土。劍麻纖維具有質(zhì)地堅硬富有彈性耐摩擦耐低溫拉伸強度高等特點，此外，還具有纖維長度大色澤潔白耐海水腐蝕等諸多特性。 本文依據(jù)已確定試配抗折強度、水灰比、砂率、單位用水量及砂石用量等主要實驗參數(shù)，開展實驗室試驗確定劍麻纖維摻量、水灰比及砂率等因素對混凝土工作性及各項路用性能的影響，并測定其抗折性能、劈裂抗拉性能等來確定實驗室最佳配合比。通過實驗室最佳配合比進行工程試驗強度的試配，結合施工現(xiàn)場原材料性能指標，工程配合比參數(shù)修正，通過在試驗路段的現(xiàn)場路面攤鋪施工，獲得工程最佳配合比。 通過大量的室內(nèi)試驗及工程試驗，并結合在湖北省黃岡市某城市道路路面上的實際工程試驗，確定了劍麻纖維混凝土的施工工藝及技術要求。研究結果表明，使用HQ-UNF萘系減水劑時宜采用干法攪拌工藝；水灰比最佳范圍為0.33～0.36，砂率優(yōu)選范圍為0.35～0.37；工程施工最佳設計配合比為：水泥：水：砂：碎石：劍麻：減水劑=1：0.340：1.343：2.501：0.010：0.025；劍麻纖維的最佳質(zhì)量摻量為0.19%。與其他纖維混凝土進行對比，劍麻纖維水泥混凝土配合比中的單位水泥用量較少，，抗折強度以及抗壓強度有很大提高，能夠使混凝土的整體性能得到提高，且成本與聚丙烯纖維混凝土對比降低約5.6％，因此具有很好的經(jīng)濟性和應用前景。
[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.
【學位授予單位】：武漢工程大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.216

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