本文選題：水泥混凝土 + 使用性能　； 參考：《哈爾濱工業(yè)大學》2013年碩士論文

【摘要】：水泥混凝土因其抗壓強度高、成本低等優(yōu)點在各個行業(yè)得到了廣泛的應(yīng)用。隨著科學技術(shù)發(fā)展和進步，對道路提出了更高的要求。作為路面材料水泥混凝土也面臨著新的挑戰(zhàn)。因為水泥混凝土是剛性材料，在溫度和應(yīng)力作用下會產(chǎn)生很多裂紋。裂紋的存在降低了水泥混凝土使用性能，縮短其使用壽命。 有效解決這個問題的手段之一，就是在水泥混凝土中摻入高彈性模量的纖維。玻璃纖維和聚丙烯纖維是未來水泥混凝土使用最有效的纖維。但是由于玻璃纖維摻入后會受到腐蝕。因此本文對玻璃纖維腐蝕行為，配合比設(shè)計，混凝土制備工藝，最佳的纖維摻入量作了相應(yīng)的研究。并通過力學性能和耐久性能來比較兩種混凝土優(yōu)劣。 在文中首先采用堿性溶液來模仿耐堿玻璃纖維在水泥混凝土中腐蝕行為。采用失重法來研究纖維腐蝕狀況，初步研究了其腐蝕機制。針對腐蝕機制，采用摻入活性摻料粉煤灰、硅灰的辦法降低水泥砂漿的堿度，保護玻璃纖維不被腐蝕，取得了較為理想的結(jié)果。 然后，在混凝土配合比設(shè)計的基礎(chǔ)上，確定了最佳的制備工藝。結(jié)果表明，先摻法可以使纖維均勻分散在混凝土中，提高了水泥混凝土各項性能指標。同時確定了最佳的耐堿玻璃纖維和改性聚丙烯纖維的摻入量，分別為1.0kg/m3、0.9kg/m3。 最后針對兩種摻入纖維的混凝土進行了力學性能、耐久性能對比。二者對于混凝土的力學性能均有所提高，其中耐堿玻璃纖維提高程度較改性聚丙烯纖維好。耐久性方面，二者均比普通混凝土優(yōu)異，其中耐堿玻璃纖維混凝土略差于改性聚丙烯纖維混凝土。研究表明：玻璃纖維和改性聚丙烯纖維混凝土都可以推廣使用，特別是對于抗凍性要求比較高的寒區(qū)建筑、交通行業(yè)。
[Abstract]:Cement concrete has been widely used in various industries because of its high compressive strength and low cost. With the development and progress of science and technology, the road has put forward higher requirements. As a pavement material, cement concrete is also facing new challenges. Because cement concrete is a rigid material, it can produce many cracks under the action of temperature and stress. The existence of cracks reduces the performance of cement concrete and shortens its service life. One of the effective ways to solve this problem is to mix high elastic modulus fibers into cement concrete. Glass fiber and polypropylene fiber are the most effective fibers for cement concrete in the future. However, due to glass fiber adulteration will be corroded. Therefore, the corrosion behavior of glass fiber, the mix ratio design, the preparation process of concrete and the optimum fiber content are studied in this paper. And through the mechanical properties and durability to compare the advantages and disadvantages of the two kinds of concrete. In this paper, alkaline solution is first used to simulate the corrosion behavior of alkali resistant glass fiber in cement concrete. The corrosion mechanism of fiber was studied by weightlessness method. According to the corrosion mechanism, the alkalinity of cement mortar is reduced by adding active fly ash and silica fume, and the glass fiber is protected from corrosion. Then, on the basis of concrete mix ratio design, the best preparation technology is determined. The results show that the fiber can be dispersed uniformly in concrete and the performance index of cement concrete can be improved. The optimum ratio of alkali resistant glass fiber and modified polypropylene fiber is 1.0 kg / m ~ (3) ~ 0.9kg 路m ~ (3) respectively. Finally, the mechanical properties and durability of two kinds of concrete mixed with fiber are compared. Both of them improve the mechanical properties of concrete, and the alkali-resistant glass fiber is better than the modified polypropylene fiber. In terms of durability, both of them are superior to ordinary concrete, and alkali-resistant fiberglass concrete is a little worse than modified polypropylene fiber concrete. The results show that both glass fiber and modified polypropylene fiber concrete can be widely used, especially for the construction and transportation industry in cold regions where the frost resistance is very high.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU528

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本文編號：1793194