發(fā)布時(shí)間：2018-06-13 04:02

  本文選題：大流動(dòng)度路面混凝土 + 正交試驗(yàn)�。� 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：大流動(dòng)度混凝土是指坍落度不小于160mm,工作性好,坍落度經(jīng)時(shí)損失小的一種高性能混凝土。大流動(dòng)度混凝土具有良好的工作性、優(yōu)異的力學(xué)性能、耐久性,在我國(guó)建設(shè)工程領(lǐng)域得到了廣泛的應(yīng)用。將大流動(dòng)度混凝土應(yīng)用于路面工程不僅施工速度快,而且可以減少環(huán)境污染和噪音喧嘩,有著顯著的社會(huì)、經(jīng)濟(jì)效益。目前我國(guó)大流動(dòng)度路面混凝土的研究相對(duì)較少,缺乏完善的技術(shù)和規(guī)程,而且大流動(dòng)度路面混凝土的力學(xué)性能研究也很分散。因此,研究大流動(dòng)度路面混凝土的力學(xué)性能對(duì)提高市政道路路面建設(shè)質(zhì)量具有重要意義。本文首先對(duì)大流動(dòng)度路面混凝土的原材料進(jìn)行研究,提出了各種原材料的技術(shù)要求;接著對(duì)大流動(dòng)度路面混凝土進(jìn)行配合比設(shè)計(jì),采用正交試驗(yàn)設(shè)計(jì)方法,選定水膠比、膠凝材料用量、砂率、粉煤灰摻量四個(gè)因素進(jìn)行試驗(yàn),以坍落度值和7d、28d齡期下的抗壓強(qiáng)度、抗折強(qiáng)度作為評(píng)價(jià)指標(biāo),利用極差、方差分析方法分析了各因素對(duì)坍落度、強(qiáng)度影響程度的大小,并根據(jù)各因素的影響程度進(jìn)行配合比調(diào)整。在正交試驗(yàn)設(shè)計(jì)的基礎(chǔ)上,研究不同因素變化對(duì)大流動(dòng)度路面混凝土抗壓、劈裂、抗折、抗沖擊、彈性模量等力學(xué)性能及早期抗裂性能的影響,同時(shí)利用MIDAS有限元軟件對(duì)大流動(dòng)度路面混凝土力學(xué)性能進(jìn)行數(shù)值模擬分析,研究了大流動(dòng)度路面混凝土在不同受力作用下的應(yīng)力分布和破壞機(jī)理,并對(duì)計(jì)算值和實(shí)測(cè)值進(jìn)行比較以驗(yàn)證試驗(yàn)的準(zhǔn)確性。最后利用SEM圖片對(duì)大流動(dòng)度路面混凝土的粉煤灰-水泥硬化漿體的微觀結(jié)構(gòu)進(jìn)行觀察和分析,研究發(fā)現(xiàn)適量的粉煤灰有助于提高大流動(dòng)度路面混凝土的力學(xué)性能,最佳摻量為20%。
[Abstract]:Large fluidity concrete is a kind of high performance concrete with good workability and low slump loss. Because of its good workability, excellent mechanical properties and durability, high fluidity concrete has been widely used in the field of construction engineering in China. The application of large fluidity concrete to pavement engineering not only has a fast construction speed, but also can reduce environmental pollution and noise. It has remarkable social and economic benefits. At present, the research of high flow pavement concrete in our country is relatively few, lack of perfect technology and regulation, and the study of mechanical performance of high flow pavement concrete is also very scattered. Therefore, it is of great significance to study the mechanical properties of high flow pavement concrete to improve the construction quality of municipal road pavement. In this paper, the raw materials of high flow pavement concrete are studied firstly, and the technical requirements of various raw materials are put forward, then the mix ratio of high flow pavement concrete is designed, and the water binder ratio is selected by orthogonal design method. Four factors, the amount of cementing material, sand rate and fly ash content, were tested. The slump value and the compressive strength and flexural strength of the cement under the age of 7 days and 28 days were taken as the evaluation indexes. The slump was analyzed by using the method of extreme difference and variance analysis. The intensity influence degree, and according to each factor influence degree carries on the mix proportion adjustment. On the basis of orthogonal experimental design, the effects of different factors on the compressive, split, flexural, impact and elastic modulus of high fluidity pavement concrete are studied. At the same time, by using Midas finite element software, the mechanical properties of pavement concrete with large fluidity are simulated and analyzed, and the stress distribution and failure mechanism of pavement concrete with large fluidity under different forces are studied. The accuracy of the test is verified by comparing the calculated values with the measured values. Finally, the microstructure of fly ash cement hardened paste of high flow pavement concrete is observed and analyzed by SEM image. It is found that proper amount of fly ash is helpful to improve the mechanical properties of high flow pavement concrete, and the best content is 20%.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 康忠壽;鈕宏;徐建虎;;硅粉和沸石粉雙摻配制高強(qiáng)度大流動(dòng)性混凝土[J];交通標(biāo)準(zhǔn)化;2005年12期

，

本文編號(hào)：2012623