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  本文關(guān)鍵詞： 鋼纖維 道路材料 工作性能 力學(xué)性能 拌合工藝　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：水泥混凝土在道路工程中已得到了廣泛的應(yīng)用,但是,其存在抗拉強度低,韌性較差等缺陷。而鋼纖維具有增強、增韌等作用,將混凝土與鋼纖維進行復(fù)合可以提高混凝土材料的韌性和抗拉強度,提高道路的使用壽命和可靠性。本課題針對實際工程要求,在普通混凝土基礎(chǔ)上研究摻加一定量的鋼纖維,從而制備出能滿足要求的鋼纖維混凝土。本課題首先根據(jù)目標要求,研究不同水灰比、單位體積用水量、砂率及摻合料(粉煤灰、礦粉)用量對混凝土性能的影響,配制出普通混凝土。在此基礎(chǔ)上根據(jù)現(xiàn)有兩種不同水泥、外加劑、鋼纖維,研究不同原材料種類對混凝土工作性能和力學(xué)性能的影響,研究并制備了C40和C55兩種鋼纖維混凝土,在制備過程中也研究了鋼纖維混凝土的成型和拌合工藝。主要研究結(jié)果:在相同原材料條件下,鋼纖維C40混凝土配合比為:W/C為0.36,鋼纖維97.5 kg/m~3,砂率45%;鋼纖維C55混凝土配合比為:W/C為0.32,鋼纖維117 kg/m~3,砂率50%。兩種混凝土單位用水量為180 kg/m~3,粉煤灰摻量為10%,礦粉摻量為20%,外加劑摻量都為1%。投料工藝為:先投砂、石子、鋼纖維,攪拌1.5min;再投膠凝材料攪拌約1min;最后投水和外加劑,攪拌約3min;出機后的混凝土分散性較好。試驗中發(fā)現(xiàn)隨著鋼纖維摻量的增加,混凝土的工作性能不斷降低,過量摻加會導(dǎo)致工作性能急劇降低,極易發(fā)生團聚。C40和C55在不影響施工性能前提下鋼纖維最大摻量分別為97.5kg/m~3和117kg/m~3。在此摻量下,相對于空白樣,C40和C55混凝土28d抗壓強度分別提高了20%和27%,而7d和28d的劈裂強度分別提高了約80%和100%。在道路材料混凝土中摻加鋼纖維,可以有效改善混凝土的性能,提高混凝土的抗裂阻韌等特性,提高路面的使用壽命。本課題針對路面混凝土材料的缺陷,通過在路面工程材料中摻加鋼纖維制備鋼纖維混凝土,不但滿足實際工程要求,同時也對鋼纖維在我國路面材料的大范圍應(yīng)用提供重要的理論和應(yīng)用指導(dǎo)。
[Abstract]:Cement concrete has been widely used in road engineering, but it has some defects such as low tensile strength and poor toughness, while steel fiber has the function of strengthening and toughening. The composite of concrete and steel fiber can improve the toughness and tensile strength of concrete material and improve the service life and reliability of road. On the basis of ordinary concrete, a certain amount of steel fiber is added to prepare the steel fiber concrete that can meet the requirements. Firstly, according to the objective requirements, the different water / cement ratio and water consumption per unit volume are studied. The influence of sand ratio and the amount of admixture (fly ash, mineral powder) on the performance of concrete is prepared. Based on this, two kinds of cement, admixture and steel fiber are used. The effects of different kinds of raw materials on the working and mechanical properties of concrete were studied and two kinds of steel fiber reinforced concrete (C40 and C55) were prepared. The main results are as follows: under the same raw material condition, the mix ratio of steel fiber C40 concrete is 0. 36% W / C. Steel fiber 97.5 kg / m ~ (3), sand rate 45%; The mix ratio of steel fiber C55 concrete is 0. 32, steel fiber is 117 kg / m ~ (3), sand ratio is 50. The unit water consumption of two kinds of concrete is 180 kg/m~3. The content of fly ash is 10, the amount of mineral powder is 20 and the amount of admixture is 1. The feeding process is: first throwing sand, stone, steel fiber, stirring 1.5 min; The gelation material was stirred for about 1 minute. Finally, water and admixture are added and stirred for about 3 mins; It is found in the experiment that with the increase of steel fiber content, the working performance of concrete decreases continuously, and the excessive addition of concrete leads to a sharp decrease in the working performance. It is easy to reunite. C40 and C55 are 97. 5 kg / m ~ (3) and 117 kg / m ~ (3) respectively without affecting the construction performance. Under this addition, compared with the blank sample, the maximum content of steel fiber is 97. 5 kg / m ~ (3) and 117 kg / m ~ (3) respectively. The compressive strength of C40 and C55 concrete increased by 20% and 27% respectively. And the splitting strength of 7d and 28d increased about 80% and 1000.The addition of steel fiber into road material concrete can effectively improve the performance of concrete, improve the crack resistance and toughness of concrete and so on. In view of the defects of pavement concrete materials, steel fiber reinforced concrete is prepared by adding steel fiber to pavement engineering materials, which not only meets the practical engineering requirements. At the same time, it also provides important theoretical and practical guidance for the wide application of steel fiber in pavement materials in China.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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本文編號：1462393