粗骨料对高性能混凝土性能影响的试验研究

发布时间：2018-03-19 12:05

本文选题：混凝土　切入点：粗骨料　出处：《北京交通大学》2013年硕士论文　论文类型：学位论文

【摘要】：粗骨料是混凝土的重要组成材料。高强度等级混凝土的制备一般采用碎石或碎卵石作为粗骨料。碎石在生产、搬运过程中产生一定量的石粉,石粉颗粒细小,粒径分布不均匀,会对高性能混凝土的性能产生影响。另外,碎卵石中的部分颗粒仍保留部分原卵石的表面,影响与水泥石的粘结,为此破碎面比例会对高性能混凝土性能产生较大的影响。本文主要进行了以下研究：石粉含量分别取0%、2%、4%、6%时,碎卵石、玄武岩碎石以及石灰岩碎石中石粉含量的变化,对不同强度等级高性能混凝土的工作性能、力学性能以及耐久性能的影响；碎卵石破碎面比例分别取0%、55%、75%、95%时,破碎面比例对C60干硬性混凝土的力学性能和抗渗性影响。研究结果表明： 1、石粉含量在0%-6%范围内,C50高性能混凝土的流动性随着玄武岩和碎卵石中的石粉含量的增大先提高再降低；C60高性能混凝土的流动性随着玄武岩石粉含量的增加而降低。 2、石粉含量在0%-6%范围内,碎卵石骨料中的石粉可以提高C50、C60高性能混凝土的抗压强度；C60高性能混凝土抗压强度随玄武岩石粉含量的增加先提高在降低；C60干硬性混凝土的抗压强度随玄武岩石粉和石灰岩石粉含量增加先提高再降低。 3、石粉含量在0%-6%范围内,C50高性能混凝土的劈拉强度随三种骨料中石粉含量增加先提高再降低；碎卵石和石灰岩碎石中石粉降低了C60高性能混凝土的劈拉强度；石灰岩骨料中石粉提高了C60干硬性混凝土的劈拉强度。 4、石粉含量在0%-6%范围内,碎卵石和玄武岩石骨料中的石粉提高了C50高性能混凝土的抗渗性；石灰岩骨料中石粉提高了C60干硬性混凝土的抗渗性,玄武岩骨料中石粉降低了C60干硬性混凝土的抗渗性。 5、碎卵石破碎面与C60干硬性混凝土力学性能和抗渗性之间呈线性关系：碎卵石骨料破碎面比例的增大有助于提高混凝土的力学性能和抗渗性。
[Abstract]:Coarse aggregate is an important component of concrete. In the preparation of high strength grade concrete, gravel or crushed pebble is generally used as coarse aggregate. A certain amount of stone powder is produced during the production and transportation of crushed stone, and the particle size of stone powder is fine and the particle size distribution is uneven. In addition, some of the particles in the crushed pebble still retain the surface of some of the original pebbles, which affect the bond with the cement stone. Therefore, the ratio of the broken surface will have a great effect on the performance of the high performance concrete. In this paper, the following studies are carried out: the content of stone powder is taken from 0 / 2 and 4 / 4, respectively, and the variation of the content of stone powder in crushed pebble, basalt and limestone gravel, respectively, to the working performance of high performance concrete of different strength grades, The effects of mechanical properties and durability on the mechanical properties and impermeability of C60 dry-hard concrete were studied by taking the ratio of broken surface of crushed pebbles as 0 and 5575, respectively, and at 95, the effect of the ratio of broken surfaces on the mechanical properties and impermeability of C60 dry-hard concrete. 1. The fluidity of C _ (50) high performance concrete decreases with the increase of basalt and pebble content, and then decreases with the increase of basalt powder content. The content of stone powder is in the range of 0-6%, The compressive strength of C _ (50) C _ (60) high performance concrete can be increased with the increase of basalt powder content, and the compressive strength of C _ (60) dry hard concrete can be reduced by increasing the content of basalt rock powder, and the compressive strength of C _ (60) hard concrete is increased with the increase of basalt content. The content of powder and limestone increased first and then decreased. (3) the splitting tensile strength of C _ (50) high performance concrete increases first and then decreases with the increase of stone powder content in three kinds of aggregates in the range of 0 ~ 6%, the split tensile strength of C _ (60) high performance concrete decreases with the increase of stone powder content in crushed pebble and limestone gravel, the splitting tensile strength of C _ (60) high performance concrete is decreased with the increase of stone powder content in three kinds of aggregates. The split tensile strength of C 60 hard concrete is improved by stone powder in limestone aggregate. 4. The content of stone powder in the range of 0-6% increases the impermeability of C50 high performance concrete by the powder of crushed pebble and basalt aggregate, and the impermeability of C60 dry hard concrete by stone powder in limestone aggregate. The rock powder in basalt aggregate reduces the impermeability of C 60 hard concrete. 5. There is a linear relationship between the broken surface of crushed pebble and the mechanical properties and impermeability of C60 dry hard concrete. The increase of the ratio of broken surface of crushed pebble aggregate helps to improve the mechanical properties and impermeability of concrete.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528

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