高強(qiáng)混凝土高性能化應(yīng)用基礎(chǔ)研究
[Abstract]:With the rapid development of our society and economy, the construction scale of high-speed railway is increasing gradually, and the application of high-strength concrete in railway is more and more extensive. Although ballastless track of high-speed railway has the advantages of good smoothness, small deformation, high reliability and less daily maintenance, the problems of high strength concrete for high speed railway prefabricated components are high viscosity and brittleness. In order to ensure the safe service of the structure, it is necessary to solve the existing problems of high strength concrete. First, the flexural toughness and impact toughness of concrete with equal strength and different content of cementing materials are studied. The results show that the impact toughness and flexural toughness of concrete can be improved obviously by reducing the amount of cementitious material. The toughening mechanism of concrete with low cementitious content is analyzed by means of thermal analyzer, mercury injection instrument and Leica microscope. The decrease of cement content leads to the decrease of defect content in concrete. At the same time, the increase of aggregate volume fraction plays a better role of "crack resistance" and "energy consumption", which leads to the improvement of flexural toughness and impact toughness of concrete. It is determined that reducing the amount of cementitious material is an effective means to improve the toughness of concrete, which lays a theoretical foundation for the preparation technology of concrete with low content of cementitious material. Secondly, on the basis of studying the sand ratio of concrete, the ratio of water to binder, the thickness of aggregate paste and the composition of cementing material, the preparation method of concrete with low content of cementitious material is put forward. According to the maximum compactness of aggregate, the sand ratio is determined to be 38, and the compactness of aggregate is calculated to be 84 / 2. According to the rheological properties of concrete, the ratio of water to binder is determined to be 0.35 and the thickness of coated aggregate membrane is selected according to the working performance. The cement material is calculated by absolute volume method, and the composition of concrete cementitious material is determined according to the strength grade of concrete by the amount of water and sand. High strength concrete with low content of cementitious material was prepared by improving the activity of cementitious material. When the amount of cementitious material is 370 kg/m3, and the composition of cement is 90% P W 62.5 white cement and 10%S95 slag powder, and the water consumption is 130 kg/m3, the strength grade of concrete can reach C80. Thirdly, on the basis of preparing concrete with different strength grade and low cementing material dosage, the evaluation method of working performance of low cementitious material concrete is studied. The thermo-physical properties, volume stability and crack resistance of concrete with equal strength and low cementitious content are compared with those of common concrete. The results show that the evaluation method of working performance should be selected according to the slump of concrete with low cement content, and the adiabatic temperature rise can be obviously reduced and the volume stability and crack resistance can be improved by reducing the amount of cement material. Finally, the engineering application is studied under the guidance of the theory of low cement content concrete. The results show that the working efficiency of track slab and sleeper can be improved by using low cementitious material content concrete, the surface of the prefabricated member is smooth and dense, and the number of cracks and defects is significantly reduced.
【學(xué)位授予單位】:中國(guó)鐵道科學(xué)研究院
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TU528
【共引文獻(xiàn)】
相關(guān)期刊論文 前10條
1 邢鋒,冷發(fā)光,馮乃謙,李偉文;高性能混凝土骨料數(shù)量效應(yīng)研究[J];四川建筑科學(xué)研究;2001年02期
2 趙文蘭;湯寄予;;自密實(shí)混凝土的力學(xué)性能研究[J];四川建筑科學(xué)研究;2006年02期
3 喬宏霞;何忠茂;劉翠蘭;;SO_4~(2-)環(huán)境下高性能混凝土耐久性研究[J];四川建筑科學(xué)研究;2006年03期
4 華建民;高育欣;;溫度作用對(duì)混凝土墻體早期開(kāi)裂的影響分析與計(jì)算[J];四川建筑科學(xué)研究;2008年02期
5 何娟;;氨基磺酸鹽高效減水劑對(duì)混凝土耐久性的影響[J];四川建筑科學(xué)研究;2008年02期
6 霍世金;尚建麗;;機(jī)制砂配制C60高性能混凝土試驗(yàn)研究及工程應(yīng)用[J];四川建筑科學(xué)研究;2008年03期
7 張文武;王振龍;何兆益;;混凝土堿集料反應(yīng)預(yù)防措施的再認(rèn)識(shí)[J];四川建筑科學(xué)研究;2009年01期
8 李柱凱;劉云;;高鈦渣復(fù)合微粉的應(yīng)用研究[J];四川建筑科學(xué)研究;2010年02期
9 丁以兵;;高性能混凝土自養(yǎng)護(hù)研究[J];四川建筑科學(xué)研究;2011年02期
10 汪海東;曾志興;;基于集對(duì)分析的高性能再生混凝土性能優(yōu)化[J];四川建筑科學(xué)研究;2012年03期
相關(guān)博士學(xué)位論文 前10條
1 曲嘉;鋼纖維混凝土劈拉強(qiáng)度的實(shí)驗(yàn)研究[D];哈爾濱工程大學(xué);2010年
2 文俊強(qiáng);石灰石粉作混凝土摻合料的性能研究及機(jī)理分析[D];中國(guó)建筑材料科學(xué)研究總院;2010年
3 李建新;高溫重構(gòu)對(duì)鋼渣組成、結(jié)構(gòu)與性能影響的研究[D];華南理工大學(xué);2011年
4 黎鵬平;膠凝材料組成與鋼筋混凝土氯離子腐蝕研究[D];華南理工大學(xué);2010年
5 楊婷婷;基于集料功能設(shè)計(jì)的水泥石界面性能研究[D];武漢理工大學(xué);2010年
6 姜從盛;輕質(zhì)高強(qiáng)混凝土脆性機(jī)理與改性研究[D];武漢理工大學(xué);2010年
7 田q;水泥基電磁防護(hù)吸波多功能復(fù)合材料的研究[D];武漢理工大學(xué);2010年
8 劉潤(rùn)清;多因素影響下低溫混凝土抗凍臨界強(qiáng)度的研究[D];大連理工大學(xué);2011年
9 譚曉倩;活化生土基低碳節(jié)能村鎮(zhèn)建筑材料研究[D];大連理工大學(xué);2011年
10 王瓊;跨斷層隧道地震反應(yīng)分析[D];中國(guó)地震局工程力學(xué)研究所;2011年
相關(guān)碩士學(xué)位論文 前10條
1 楊明林;塑性混凝土配合比及性能指標(biāo)試驗(yàn)研究[D];鄭州大學(xué);2010年
2 陳高鋒;鋼絲網(wǎng)約束混凝土軸壓性能試驗(yàn)研究[D];鄭州大學(xué);2010年
3 趙亮平;高溫中纖維礦渣微粉混凝土力學(xué)性能研究[D];鄭州大學(xué);2010年
4 孟麗峰;粉煤灰基地質(zhì)聚合物的強(qiáng)度影響因素及其固化Pb~(2+)的形態(tài)分析[D];鄭州大學(xué);2010年
5 張雷;TRC抗彎加固RC梁的有限元分析[D];大連理工大學(xué);2010年
6 趙暢;海洋環(huán)境下高性能混凝土耐久性試驗(yàn)研究[D];大連理工大學(xué);2010年
7 陳相宇;纖維混凝土抗沖擊性能的試驗(yàn)研究[D];大連理工大學(xué);2010年
8 彭超;單向荷載、凍融循環(huán)及齡期對(duì)混凝土氯離子滲透性的影響研究[D];大連理工大學(xué);2010年
9 李強(qiáng);水性環(huán)氧樹(shù)脂改性瀝青混凝土路面材料研究[D];長(zhǎng)沙理工大學(xué);2009年
10 張建波;混凝土孔隙分形特征表征氯離子滲透性能研究[D];中國(guó)建筑材料科學(xué)研究總院;2010年
,本文編號(hào):2227610
本文鏈接:http://sikaile.net/jingjilunwen/jianzhujingjilunwen/2227610.html