本文關(guān)鍵詞：抗凍透水混凝土研制及其性能研究　出處：《山東農(nóng)業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 透水混凝土 配合比 抗凍性能 抗沖擊性能

【摘要】：隨著城市化進程的加快,水泥混凝土路面大面積鋪設(shè),透水性地面面積逐漸縮小,這對生態(tài)環(huán)境帶來了許多不利,面對日趨嚴重的水資源短缺以及環(huán)境問題,生態(tài)混凝土的應(yīng)用更加符合生態(tài)文明建設(shè)的要求,對改善城市生態(tài)環(huán)境,實現(xiàn)水的循環(huán)利用有著重要意義。本文以抗凍透水混凝土為研究對象,在課題組前期的研究基礎(chǔ)之上,針對透水混凝土現(xiàn)存的強度以及抗凍性能不足等方面進行了研究,通過添加合成纖維以及添加劑,對透水混凝土進行了力學(xué)性能、抗凍性能、透水性能以及抗沖擊性能等方面的研究。采用物理試驗與理論分析的方法,從混凝土的宏觀性能和微觀破壞機理等角度探討了各種外摻材料對透水混凝土性能的影響規(guī)律,為透水混凝土在更廣范圍內(nèi)的推廣應(yīng)用提供了理論依據(jù)。首先,通過查閱參考文獻對透水混凝土進行整體的認識,了解目前國內(nèi)外對透水混凝土的研究方法,確定各外摻材料的大致范圍,并依據(jù)研究方向選取了衡量透水混凝土工作性能的評價指標(biāo)。其次,選取水灰比、目標(biāo)孔隙率、塑鋼纖維摻量、聚丙烯腈纖維摻量四個控制因素,首先進行了水灰比的單因素研究,通過對試驗結(jié)果的分析,確定了在保證良好強度和透水率下水灰比的大致范圍,在確定了水灰比的大致范圍后,在此水灰比的基礎(chǔ)之上分別進行了塑鋼纖維與聚丙烯腈纖維的單摻試驗,通過分析試驗結(jié)果,確定了塑鋼纖維和聚丙烯腈纖維摻量的大致范圍。然后,在以上單因素試驗所得結(jié)果的基礎(chǔ)上進行透水混凝土配合比優(yōu)化正交試驗,確定出透水混凝土的基礎(chǔ)配比,并對其進行優(yōu)化。通過對正交試驗結(jié)果的分析,確定四個因素對透水混凝土抗壓強度、抗折強度、透水系數(shù)以及抗凍性能的影響次序,分析試驗結(jié)果得到透水混凝土的基礎(chǔ)配比,在基礎(chǔ)配比的基礎(chǔ)之上進行了基礎(chǔ)配合比的優(yōu)化并測量了優(yōu)化后各項性能指標(biāo),得到最優(yōu)配比。最后,在最優(yōu)配比的基礎(chǔ)之上制作透水混凝土試件進行抗沖擊試驗,測得了在不同工況下透水混凝土的抗沖擊性能,分析了外摻材料對透水混凝土抗沖擊性能的影響,探究透水混凝土的破壞機理,為透水混凝土的工程應(yīng)用提供了理論依據(jù)。通過試驗研究得到以下結(jié)論:透水混凝土的水灰比與強度之間的關(guān)系不同于普通透水混凝土,在綜合協(xié)調(diào)水灰比、強度、孔隙率與透水系數(shù)的關(guān)系后確定了最佳水灰比;確定了塑鋼纖維的最優(yōu)摻量,得出適宜摻量的塑鋼纖維能夠提高透水混凝土的力學(xué)、抗凍以及抗沖擊性能,尤其對抗折性能以及抗凍性能提高影響顯著,試驗結(jié)果表明摻加纖維后透水混凝土強度提高了約30%,抗凍性能提高了55%,抗沖擊性能提高了60%;試驗所采用的纖維、膠粉與砂子復(fù)合增強的方法提高了透水混凝土的抗凍性能,為其在北方寒冷地區(qū)的推廣創(chuàng)造了條件。
[Abstract]:With the acceleration of urbanization, cement concrete pavement is laid in a large area, and the permeable surface area is gradually reduced, which brings many disadvantages to the ecological environment, facing the increasingly serious shortage of water resources and environmental problems. The application of ecological concrete is more in line with the requirements of ecological civilization construction. It is of great significance to improve the urban ecological environment and realize the recycling of water. Based on the previous research of our group, the existing strength and frost resistance of permeable concrete were studied, through adding synthetic fiber and additives. The mechanical properties, freezing resistance, water permeability and impact resistance of pervious concrete were studied. The physical test and theoretical analysis were used. In this paper, the effects of various admixtures on the performance of permeable concrete are discussed from the point of view of macroscopic properties and microscopic failure mechanism of concrete, which provides a theoretical basis for the popularization and application of permeable concrete in a wider range. Through consulting references to the whole understanding of permeable concrete, understand the current research methods of permeable concrete at home and abroad, determine the general range of the admixture materials. And according to the research direction selected to evaluate the performance of pervious concrete evaluation index. Secondly, select the water-cement ratio, the target porosity, plastic steel fiber content, polyacrylonitrile fiber content four control factors. First, the single factor study of water-cement ratio is carried out. Through the analysis of the test results, the approximate range of water-cement ratio is determined in order to ensure good strength and permeability, and the approximate range of water-cement ratio is determined. On the basis of the water-cement ratio, the single mixing test of plastic-steel fiber and polyacrylonitrile fiber was carried out, and the approximate range of the content of plastic-steel fiber and polyacrylonitrile fiber was determined by analyzing the test results. On the basis of the results obtained from the single factor test above, the orthogonal test is carried out to optimize the mixture ratio of permeable concrete, to determine the basic ratio of permeable concrete, and to optimize the mixture ratio of permeable concrete. Through the analysis of the results of orthogonal test. The influence order of four factors on the compressive strength, flexural strength, water permeability coefficient and frost resistance of permeable concrete is determined, and the basic ratio of permeable concrete is obtained by analyzing the test results. On the basis of the base ratio, the optimization of the basic mix ratio was carried out, and the optimized performance indexes were measured. Finally, the optimal ratio was obtained. On the basis of the optimum ratio, the impact resistance of permeable concrete was tested, and the impact resistance of permeable concrete under different working conditions was measured, and the effect of admixture on the impact resistance of permeable concrete was analyzed. The failure mechanism of permeable concrete is discussed. This paper provides a theoretical basis for the engineering application of permeable concrete. Through the experimental study, the following conclusions are drawn: the relationship between water-cement ratio and strength of permeable concrete is different from that of ordinary permeable concrete, and the water-cement ratio is coordinated in a comprehensive way. The optimum water-cement ratio is determined by the relationship among strength, porosity and permeability coefficient. The optimum content of plastic-steel fiber is determined, and it is concluded that the optimum content of plastic-steel fiber can improve the mechanics, frost resistance and impact resistance of water-permeable concrete, especially the anti-flexural property and the anti-freezing property. The test results show that the strength of pervious concrete with fiber is increased by about 30%, the frost resistance is increased by 55%, and the impact resistance is improved by 60%. The composite reinforcing method of fiber, rubber powder and sand has improved the frost resistance of permeable concrete and created conditions for its popularization in the cold area of northern China.
【學(xué)位授予單位】：山東農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U414

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