Mechanical properties of recycled sand ultra-high performance concrete
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摘要: 超高性能混凝土(Ultra-high performance concrete,UHPC)因其优异的力学性能而广受关注。传统混凝土制备消耗了大量天然砂,导致天然砂供应短缺和价格上涨,增加了UHPC的制备成本,不利于UHPC保持稳定的力学性能。由建筑垃圾破碎生产的再生砂因其来源丰富、体量巨大、绿色环保,具有取代天然砂制备UHPC的潜力。为验证再生砂替代天然砂制备UHPC的可行性,本文研究了再生砂取代率、粒径和砂胶比等因素对UHPC的拉伸和压缩性能的影响。结果表明:再生砂UHPC仍具有较好的力学性能,随着再生砂取代率增大,再生砂UHPC的抗压强度、弹性模量和抗拉强度均逐渐减小;再生砂粒径与砂胶比对力学性能的影响甚微,当砂胶比从0.6增大到0.9时,弹性模量仅下降5.5%。本文建立了考虑再生砂掺量的UHPC静弹性模量计算公式,提出了再生砂UHPC棱柱体抗压强度与弹性模量的经验公式。再生砂UHPC具有成本低、性能高、绿色环保等特点,通过对其基本力学性能的表征,并建立相应的计算公式,为后续再生砂UHPC的结构应用奠定了基础。Abstract: Ultra-high performance concrete (UHPC) has attracted attention due to its excellent mechanical properties. Traditional concrete preparation consumes a large amount of natural sand, resulting in the shortage of natural sand and raising price, which increases the preparation cost of UHPC and is not conducive to maintaining stable mechanical properties of UHPC. The recycled sand produced by crushed construction waste has the potential to replace natural sand to prepare UHPC because of its plentiful sources, large reserves and green environmental protection. To verify the feasibility of recycled sand UHPC, the effects of different replacement rates of recycled sand, particle size and sand binder ratio on the tensile and compressive properties of UHPC were studied. The results show that: Recycled sand UHPC still has desired mechanical properties. With the increase of recycled sand content, the compressive strength, elastic modulus and tensile strength of recycled sand UHPC gradually decrease. The particle size and sand binder ratio have little effect on the mechanical properties. When the sand binder ratio increases from 0.6 to 0.9, the elastic modulus decreases by 5.5%. The calculation formula of UHPC static elastic modulus considering the content of recycled sand was established, and the empirical formula of compressive strength and elastic modulus was put forward. Recycled sand UHPC has the characteristics of low cost, high performance, green environmental protection. Describing basic mechanical properties and establishing the corresponding calculation formula lay a foundation for the subsequent structural application of recycled sand UHPC.
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Key words:
- UHPC /
- recycled sand /
- compressive strength /
- elastic modulus /
- tensile strength
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图 11 再生砂UHPC拉伸性能对比:(a) 不同取代率受拉应力-应变曲线;(b) 受拉断面;(c) 不同取代率;(d) 不同粒径;(e) 不同砂胶比
Figure 11. Comparison of tensile stress of recycled sand UHPC: (a) Tensile stress-strain curves of different substitution rates; (b) Tensile section; (c) Different substitution rates; (d) Different particle sizes; (e) Different sand binder ratios
表 1 超高性能混凝土(UHPC)配合比 (质量比)
Table 1. Propotion of mixture of ultra-high performance concrete (UHPC) (Mass ratio)
Mixture ID Cement Silica fume Fly
ashQuartz
flourQuartz
sandRecycled sand Water Super-
plasticizerSubstitution
rate/%Sand
binder
ratioRecycled sand size/mm U0 1.00 0.25 0.25 0.25 1.75 – 0.28 0.016 0 – – U25 1.00 0.25 0.25 0.25 1.31 0.39 0.28 0.016 25 – 1.18-2.36 U50 1.00 0.25 0.25 0.25 0.88 0.78 0.28 0.016 50 – 1.18-2.36 U100-0.9-Z 1.00 0.25 0.25 0.25 – 1.56 0.28 0.016 100 0.9 1.18-2.36 U100-0.8-Z 1.00 0.25 0.25 0.25 – 1.40 0.28 0.015 100 0.8 1.18-2.36 U100-0.6-Z 1.00 0.25 0.25 0.25 – 1.05 0.28 0.015 100 0.6 1.18-2.36 U100-0.8-X 1.00 0.25 0.25 0.25 – 1.40 0.28 0.015 100 0.8 0.30-1.18 U100-0.8-C 1.00 0.25 0.25 0.25 – 1.40 0.28 0.014 100 0.8 2.36-4.75 Notes: Z—Medium; X—Fine; C—Coarse. -
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