【摘要】：自密實(shí)混凝土(Self-Compacting Concrete,簡(jiǎn)稱SCC)是21世紀(jì)最具創(chuàng)新性的一種高性能混凝土,具有良好的工作性能和密實(shí)性,在澆筑時(shí)僅依靠自重就能充填到模型中的每部分,同時(shí)還可以防止出現(xiàn)骨料離析和泌水現(xiàn)象。與普通混凝土相比,自密實(shí)混凝土具有優(yōu)異的工作性能、力學(xué)性能和耐久性。為了推廣自密實(shí)混凝土的應(yīng)用,本文對(duì)自密實(shí)混凝土的配合比以及力學(xué)性能進(jìn)行了相關(guān)的試驗(yàn)研究,主要研究成果如下:1.采用骨料間隙體積填充的配合比設(shè)計(jì)方法配制了三種普通天然碎石骨料的自密實(shí)混凝土DNC、MNC、UNC,通過多次試配,根據(jù)工作性能、強(qiáng)度的要求選出強(qiáng)度為60MPa的自密實(shí)混凝土的最優(yōu)配合比;然后,以此最優(yōu)配合比為基礎(chǔ)配制出工作性能較好的自密實(shí)全輕骨料混凝土AL、自密實(shí)輕粗骨料混凝土CL和自密實(shí)輕砂骨料混凝土FL;2.通過27個(gè)100×100×100mm立方體試件、9個(gè)150×150×150mm立方體試件、9個(gè)150×150×300mm棱柱體試件和9個(gè)100×100×400mm小梁試件式自密實(shí)混凝土試件的試驗(yàn),研究了粗骨料含量對(duì)自密實(shí)混凝土立方體抗壓強(qiáng)度、軸心抗壓強(qiáng)度以及抗折強(qiáng)度的影響,分析了自密實(shí)混凝土立方體抗壓試件的尺寸換算系數(shù)以及軸心抗壓強(qiáng)度、抗折強(qiáng)度與立方體抗壓強(qiáng)度之間的關(guān)系;3.通過9個(gè)150×150×150mm立方體試件、9個(gè)150×150×300mm棱柱體試件、9個(gè)100×100×400mm小梁試件式自密實(shí)輕骨料混凝土試件的試驗(yàn),研究了骨料類型對(duì)自密實(shí)混凝土立方體抗壓強(qiáng)度、軸心抗壓強(qiáng)度以及抗折強(qiáng)度的影響,分析了自密實(shí)輕骨料混凝土立方體抗壓強(qiáng)度與骨料堆積密度和混凝土表干密度的關(guān)系,得到了軸心抗壓強(qiáng)度和抗折強(qiáng)度與立方體抗壓強(qiáng)度之間的關(guān)系系數(shù);4.通過3個(gè)150×150×150mm立方體試件、3個(gè)150×150×300mm棱柱體試件、3個(gè)100×100×400mm小梁試件式鋼纖維自密實(shí)全輕骨料混凝土試件的試驗(yàn),研究了鋼纖維對(duì)自密實(shí)混凝土立方體抗壓強(qiáng)度、軸心抗壓強(qiáng)度以及抗折強(qiáng)度的影響,分析了鋼纖維的摻入對(duì)軸心抗壓強(qiáng)度和抗折強(qiáng)度與立方體抗壓強(qiáng)度之間的關(guān)系系數(shù)的影響。
[Abstract]:Self-compacting concrete (SCC) is one of the most innovative high-performance concrete in the 21st century. It has good working performance and compactness, and can be filled into every part of the model only by self-weight. At the same time, it can prevent aggregate segregation and bleeding. Compared with ordinary concrete, self-compacting concrete has excellent working performance, mechanical property and durability. In order to popularize the application of self-compacting concrete, the mixture ratio and mechanical properties of self-compacting concrete are studied in this paper. The main results are as follows: 1. The self-compacting concrete DNC,MNC,UNC, of three kinds of common natural crushed stone aggregate was prepared by using the mix ratio design method of aggregate interstitial volume filling, and according to the working performance, the self-compacting concrete DNC,MNC,UNC, of three kinds of common natural crushed stone aggregate was prepared by several tests. The optimum mix ratio of self-compacting concrete with strength of 60MPa is selected. Then, the self-compacting lightweight aggregate concrete (CL) and self-compacting lightweight aggregate concrete (FL;2.) with good working performance are prepared on the basis of the optimum mix ratio. The self-compacting lightweight aggregate concrete CL and the self-compacting lightweight coarse aggregate concrete FL;2. are prepared. The compressive strength of self-compacting concrete cube was studied by the experiments of 27 脳 100 脳 100mm cube specimens, 9 150 脳 150 脳 150mm cube specimens, 9 150 脳 150 脳 300mm prism specimens and 9 100 脳 100 脳 400mm trabeculae specimens of self-compacting concrete. The effects of axial compressive strength and flexural strength on the size conversion coefficient and the relationship between the axial compressive strength, the flexural strength and the cube compressive strength of self-compacting concrete cube are analyzed. 3. The compressive strength of self-compacting concrete cube was studied by the tests of 9 150 脳 150 脳 150mm cube specimens, 9 150 脳 150 脳 300mm prism specimens and 9 100 脳 100 脳 400mm trabeculae specimens of self-compacting lightweight aggregate concrete. The effects of axial compressive strength and flexural strength on the cube compressive strength of self-compacting lightweight aggregate concrete are analyzed. The relationship between cube compressive strength and aggregate accumulation density and concrete surface dry density is analyzed. The relation coefficients between the axial compressive strength, the flexural strength and the cube compressive strength are obtained. 4. The compressive strength of steel fiber to self-compacting concrete cube was studied by means of three 150 脳 150 脳 150mm cube specimens, three 150 脳 150 脳 300mm prism specimens and three 100 脳 100 脳 400mm trabeculae specimens of steel fiber self-compacting total lightweight aggregate concrete. The influence of the axial compressive strength and the flexural strength on the relationship coefficient between the axial compressive strength and the bending strength and the cube compressive strength was analyzed.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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本文編號(hào)：2398342