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The Research on Preparation of Environmentally Friendly Ultra High Performance Concrete with Low Cost

Author: LiBoXun
Tutor: HuangZhengYu
School: Hunan University
Course: Structural Engineering
Keywords: Ultra-high-performance concrete Environmental protection Low cost Strength Mobility River sand Fly ash
CLC: TU528
Type: Master's thesis
Year: 2009
Downloads: 104
Quote: 2
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Abstract


Prepared in this stage international UHPC (Ultra High Performance Concrete), because unilateral large amount of concrete cement , quartz sand as coarse aggregate leaving higher costs , In addition , due to the very small water -cement ratio and make it work is especially poor mobility, and promote the use of greatly hampered . In this paper, these shortcomings system pilot study First -depth analysis of the various factors that include river sand , silica fume , water cement ratio , curing system UHPC compressive strength and fluidity , optimized the UHPC material composition and the composition ratio . To this end, reached an optimum mixture ratio . Then , a systematic analysis of the aggregate impact on the performance of the UHPC draw impurities aggregate types as well as river sand , maximum particle size gradation UHPC impact . By gray relational systems , specific analysis of the gradation of river sand UHPC compressive strength and liquidity , drawn in the sand of various particle size 0.16 to 0.315mm, the scope of the sand in the standard conservation , water conservation and impact the performance of UHPC under three conditions of high temperature conservation . Finally, the study fly ash impact on the UHPC work performance under the best-fit than in advance , by mixing the appropriate dosage of fly ash can significantly improve the liquidity and long-term strength of UHPC ; proposed using \function factor \Cost , the use of fly ash to replace cement and using river sand instead of quartz sand , and test study used ordinary steel fibers instead of copper plating steel fiber ; superplasticizer and fly ash to improve liquidity composed of cementitious systems ; successful preparation of a less than 2.5mm diameter natural graded river sand and fly ash the same amount to replace 20% of cement and liquidity 28d standard curing compressive strength above 120MPa low cost environmentally friendly UHPC.

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products
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