自密实混凝土配合比及力学性能研究
发布时间：2019-01-02 09:45
【摘要】：自密实混凝土(Self-Compacting Concrete,简称SCC)是21世纪最具创新性的一种高性能混凝土,具有良好的工作性能和密实性,在浇筑时仅依靠自重就能充填到模型中的每部分,同时还可以防止出现骨料离析和泌水现象。与普通混凝土相比,自密实混凝土具有优异的工作性能、力学性能和耐久性。为了推广自密实混凝土的应用,本文对自密实混凝土的配合比以及力学性能进行了相关的试验研究,主要研究成果如下:1.采用骨料间隙体积填充的配合比设计方法配制了三种普通天然碎石骨料的自密实混凝土DNC、MNC、UNC,通过多次试配,根据工作性能、强度的要求选出强度为60MPa的自密实混凝土的最优配合比;然后,以此最优配合比为基础配制出工作性能较好的自密实全轻骨料混凝土AL、自密实轻粗骨料混凝土CL和自密实轻砂骨料混凝土FL;2.通过27个100×100×100mm立方体试件、9个150×150×150mm立方体试件、9个150×150×300mm棱柱体试件和9个100×100×400mm小梁试件式自密实混凝土试件的试验,研究了粗骨料含量对自密实混凝土立方体抗压强度、轴心抗压强度以及抗折强度的影响,分析了自密实混凝土立方体抗压试件的尺寸换算系数以及轴心抗压强度、抗折强度与立方体抗压强度之间的关系;3.通过9个150×150×150mm立方体试件、9个150×150×300mm棱柱体试件、9个100×100×400mm小梁试件式自密实轻骨料混凝土试件的试验,研究了骨料类型对自密实混凝土立方体抗压强度、轴心抗压强度以及抗折强度的影响,分析了自密实轻骨料混凝土立方体抗压强度与骨料堆积密度和混凝土表干密度的关系,得到了轴心抗压强度和抗折强度与立方体抗压强度之间的关系系数;4.通过3个150×150×150mm立方体试件、3个150×150×300mm棱柱体试件、3个100×100×400mm小梁试件式钢纤维自密实全轻骨料混凝土试件的试验,研究了钢纤维对自密实混凝土立方体抗压强度、轴心抗压强度以及抗折强度的影响,分析了钢纤维的掺入对轴心抗压强度和抗折强度与立方体抗压强度之间的关系系数的影响。
[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.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
本文编号：2398342
[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.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
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