本文選題：混凝土　切入點(diǎn)：粗骨料　出處：《北京交通大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：粗骨料是混凝土的重要組成材料。高強(qiáng)度等級(jí)混凝土的制備一般采用碎石或碎卵石作為粗骨料。碎石在生產(chǎn)、搬運(yùn)過(guò)程中產(chǎn)生一定量的石粉,石粉顆粒細(xì)小,粒徑分布不均勻,會(huì)對(duì)高性能混凝土的性能產(chǎn)生影響。另外,碎卵石中的部分顆粒仍保留部分原卵石的表面,影響與水泥石的粘結(jié),為此破碎面比例會(huì)對(duì)高性能混凝土性能產(chǎn)生較大的影響。 本文主要進(jìn)行了以下研究：石粉含量分別取0%、2%、4%、6%時(shí),碎卵石、玄武巖碎石以及石灰?guī)r碎石中石粉含量的變化,對(duì)不同強(qiáng)度等級(jí)高性能混凝土的工作性能、力學(xué)性能以及耐久性能的影響；碎卵石破碎面比例分別取0%、55%、75%、95%時(shí),破碎面比例對(duì)C60干硬性混凝土的力學(xué)性能和抗?jié)B性影響。研究結(jié)果表明： 1、石粉含量在0%-6%范圍內(nèi),C50高性能混凝土的流動(dòng)性隨著玄武巖和碎卵石中的石粉含量的增大先提高再降低；C60高性能混凝土的流動(dòng)性隨著玄武巖石粉含量的增加而降低。 2、石粉含量在0%-6%范圍內(nèi),碎卵石骨料中的石粉可以提高C50、C60高性能混凝土的抗壓強(qiáng)度；C60高性能混凝土抗壓強(qiáng)度隨玄武巖石粉含量的增加先提高在降低；C60干硬性混凝土的抗壓強(qiáng)度隨玄武巖石粉和石灰?guī)r石粉含量增加先提高再降低。 3、石粉含量在0%-6%范圍內(nèi),C50高性能混凝土的劈拉強(qiáng)度隨三種骨料中石粉含量增加先提高再降低；碎卵石和石灰?guī)r碎石中石粉降低了C60高性能混凝土的劈拉強(qiáng)度；石灰?guī)r骨料中石粉提高了C60干硬性混凝土的劈拉強(qiáng)度。 4、石粉含量在0%-6%范圍內(nèi),碎卵石和玄武巖石骨料中的石粉提高了C50高性能混凝土的抗?jié)B性；石灰?guī)r骨料中石粉提高了C60干硬性混凝土的抗?jié)B性,玄武巖骨料中石粉降低了C60干硬性混凝土的抗?jié)B性。 5、碎卵石破碎面與C60干硬性混凝土力學(xué)性能和抗?jié)B性之間呈線性關(guān)系：碎卵石骨料破碎面比例的增大有助于提高混凝土的力學(xué)性能和抗?jié)B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.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528

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