發(fā)布時間：2018-05-22 11:12

  本文選題：清水混凝土 + 外加劑��； 參考：《山西大學》2017年碩士論文

【摘要】：隨著科學技術的不斷進步和發(fā)展,人類環(huán)保意識的提高和審美觀念的轉變,普通混凝土已經難以達到施工建筑和人類審美觀的要求,于是,一種一次澆筑成型,不作任何外物修飾的新型混凝土,即清水混凝土浮現(xiàn)于世。由于清水混凝土的表面不作外物修飾,故其對混凝土表面光潔度要求相當之高。然而,混凝土在施工過程中由于原材料、施工工藝等因素的影響,混凝土在施工過程中容易在表面出現(xiàn)縫隙、夾層、麻面、蜂窩、氣孔等不良現(xiàn)象。這些缺陷將對清水混凝土的表面光潔度及使用效果造成很大的影響。因此,如何徹底的解決混凝土的表面質量問題成為工程界討論的熱點。本文在前人研究的基礎上從化學的角度,即通過對混凝土外加劑的摻入進行調整以改善混凝土的表面光潔度。本文主要進行了以下研究:(1)本文考察了混凝土配合比對混凝土工作性能的影響,在實驗室混凝土配合比的基礎上,以混凝土拌和實驗對其進行調整,最終通過試驗數(shù)據得出結論:拌和混凝土的最優(yōu)砂率、水灰比、單位體積用水量分別為41%、0.45、175kg/m~3。(2)在混凝土最佳配合比下,考察了混凝土外加劑對混凝土工作性能的影響。通過混凝土試驗分析得:拌和混凝土最優(yōu)聚羧酸減水劑品種為A2,摻量為1.45%;外加劑復配所用引氣劑、消泡劑的最優(yōu)品種為B2、C1,摻量分別為0.1‰、0.06‰。擬定外加劑復配方案并拌和混凝土,對其表面進行觀察并以Image pro plus圖像分析軟件進行評價,最終得出:外加劑對混凝土的表面光潔度有較大影響,當聚羧酸減水劑、引氣劑、消泡劑的摻量分別為1.45%、0.1‰、0.06‰,混凝土獲得最佳表面光潔度。
[Abstract]:With the continuous progress and development of science and technology, the improvement of human environmental protection consciousness and the change of aesthetic concept, it is difficult for ordinary concrete to meet the requirements of construction and human aesthetics. A new type of concrete, called fair-faced concrete, emerges without any exterior modification. Because the surface of fair-faced concrete is not modified by external objects, it requires high surface finish of concrete. However, due to the influence of raw materials, construction technology and other factors in the construction process of concrete, cracks, sandwich layers, hemp surfaces, honeycomb, air holes and other bad phenomena are easy to appear in the construction process of concrete. These defects will have a great impact on the surface finish and application effect of fair-faced concrete. Therefore, how to solve the problem of concrete surface quality has become a hot topic in engineering circles. On the basis of previous studies, this paper improves the surface finish of concrete by adjusting the admixture of concrete from a chemical point of view. This paper mainly carried out the following research: 1) this paper investigates the influence of concrete mix ratio on concrete performance, and adjusts it with concrete mixing experiment on the basis of laboratory concrete mix ratio. Finally, through the test data, it is concluded that the optimum sand ratio, water-cement ratio and water consumption per unit volume of concrete are 41 1 / 0. 45175 kg / m ~ (3. 2) under the optimum mix ratio of concrete, the effect of concrete admixture on the working performance of concrete is investigated. Through the concrete test and analysis, it is obtained that the optimum variety of polycarboxylic acid water reducer is A _ 2 and the amount of water reducer is 1.45, and the optimum variety of air entraining agent and defoamer used in admixture is B _ 2C _ 1, with addition of 0.1 鈥，

本文編號：1921825