超高性能混凝土（Ultra High Performance Concrete，UHPC）是一种具有超高强度、高韧性、高耐久性的水泥基复合材料。超高性能混凝土骨料选用粒径小于2mm的石英砂，减少内部缺陷，提高均一性，具有优异的力学性能和耐久性能。石英砂资源的生产工艺复杂，提高了UHPC的生产成本，限制了UHPC的大规模推广应用。本文分别利用废弃混凝土生产的再生骨料和废弃石屑生产的石屑骨料制备生态型UHPC，降低UHPC制备成本的同时消耗了固体废料。研究了原材料、养生条件、配合比等因素对再生骨料、石屑制备的生态型UHPC的力学性能和耐久性能的影响规律，本文对再生骨料和石屑骨料制备的生态型UHPC分别进行了配合比试验，得到的主要结论如下：

（1）使用石屑骨料制备出了廉价、环保、满足性能要求的生态型UHPC，石屑UHPC的力学性能达到了国家标准中RPC100的性能等级。通过配合比试验发现，UHPC配合比中随着水胶比提高，力学性能逐渐降低，流动度逐渐增加；随着集料掺量的提高，力学性能先增加后降低，流动度逐渐降低；随着减水剂掺量的增加，力学性能变化较小，流动度逐渐增加；随着钢纤维掺量的提高，力学性能逐渐提高，流动度降低。集胶比为1.6，水胶比为0.2，钢纤维体积掺量为1.5%，减水剂掺量为2.1%时，石屑UHPC的力学强度和工作性能最佳。石屑UHPC的应力-应变曲线特征与传统UHPC相似，钢纤维不仅能提高UHPC的力学强度，还能有效提高UHPC的韧性和残余抗压强度。热养护能有效提高石屑UHPC的抗压强度，但对抗折强度影响不大。四种养护条件对石屑UHPC作用效果由高到低依次为：组合养护＞干热养护＞水浴养护＞标准养护。

（2）利用再生骨料制备的生态型UHPC，抗折强度达到了RPC100的力学等级标准，同时抗压强度超过了高强混凝土的性能要求。通过配合比试验发现，UHPC配合比中，随着集胶比的提高，力学逐渐降低；随着钢纤维掺量的增加，抗折强度和劈裂抗拉强度逐渐增加，抗压强度变化较小；蒸汽养生能够大幅提高生态型UHPC的力学性能。采用0.6～2.36mm骨料的UHPC力学性能最优，建议工程应用中优先采用此范围的再生骨料。

（3）采用慢冻法研究了再生骨料UHPC耐久性能中的抗冻性能，试验发现冻融循环后，再生骨料UHPC试件的抗压强度最高降低21%，最低降低9%，满足混凝土D50的抗冻标号。再生骨料UHPC耐久性能优异，可以作为抗冻混凝土在寒冷地区使用。随着骨料掺量的增加，抗压强度损失率逐渐降低，UHPC的抗冻性能逐渐提高。经过标准养生和蒸汽养生的UHPC试件强度损失率相差不大，蒸汽养生对生态型UHPC的抗冻性能影响有限。不同粒径的骨料粒径对UHPC的耐久性影响不大，强度损失率均在12%左右。冻融后劈裂试件的劈裂抗拉强度损失率为8.8%～23.3%，经过蒸汽养生试件的强度损失率较低。

Ultra High Performance Concrete (UHPC) is a cement-based composite material with ultra-high strength, high toughness and high durability. Ultra-high performance concrete aggregates are made of quartz sand with a particle size of less than 2mm, which reduces internal defects, improves uniformity, and has excellent mechanical properties and durability. The production process of quartz sand resources is complicated, which increases the production cost of UHPC and limits the large-scale promotion and application of UHPC. This paper uses recycled aggregates produced from waste concrete and stone chip aggregates produced from waste stone chips to prepare ecological UHPC, which reduces the cost of UHPC preparation and consumes solid waste. The effects of raw materials, health conditions, mix ratio and other factors on the mechanical properties and durability of ecological UHPC prepared from recycled aggregates and stone chips are studied. After the mix ratio test, the main conclusions obtained are as follows:

Using stone chip aggregates, an eco-type UHPC that is inexpensive, environmentally friendly and meets performance requirements is prepared. The mechanical properties of stone chip UHPC have reached the performance level of RPC100 in the national standard. Through the mix ratio test, it is found that as the water-binder ratio increases in the UHPC mix ratio, the mechanical properties gradually decrease and the fluidity gradually increases; with the increase of the aggregate content, the mechanical properties first increase and then decrease, and the fluidity gradually decreases; With the increase of the amount of water reducing agent, the change of mechanical properties is small, and the fluidity gradually increases; with the increase of the amount of steel fiber, the mechanical properties gradually increase and the fluidity decreases. When the aggregate ratio is 1.6, the water-gel ratio is 0.2, the volume of steel fiber is 1.5%, and the content of water reducing agent is 2.1%, the mechanical strength and working performance of stone chips UHPC are the best. The characteristics of the stress-strain curve of stone chips UHPC are similar to those of traditional UHPC. Steel fiber can not only improve the mechanical strength of UHPC, but also effectively improve the toughness and residual compressive strength of UHPC. Thermal curing can effectively improve the compressive strength of stone chips UHPC, but has little effect on the flexural strength. The effect of the four curing conditions on the UHPC of stone chips is from high to low: combined curing>dry heat curing>water bath curing>standard curing.

The ecological UHPC made from recycled aggregates has a flexural strength that reaches the RPC100 mechanical grade standard, and the compressive strength exceeds the performance requirements of high-strength concrete. Through the mix ratio test, it is found that in the UHPC mix ratio, as the aggregate ratio increases, the mechanics gradually decreases; with the increase of the steel fiber content, the flexural strength and split tensile strength gradually increase, and the compressive strength changes little; Steam curing can greatly improve the mechanical properties of ecological UHPC. UHPC with 0.6～2.36mm aggregate has the best mechanical properties. It is recommended that recycled aggregates in this range should be used first in engineering applications.

The slow freezing method was used to study the frost resistance in the durability of recycled aggregate UHPC. The test found that after the freeze-thaw cycle, the compressive strength of recycled aggregate UHPC specimens decreased by 21% at the highest and 9% at the lowest, reach the frost resistance mark of concrete D50. Recycled aggregate UHPC has excellent durability and can be used as antifreeze concrete in cold regions. With the increase of aggregate content, the loss rate of compressive strength gradually decreases, and the frost resistance of UHPC gradually improves. The strength loss rate of UHPC specimens after standard curing and steam curing is not much different, and steam curing has a limited effect on the frost resistance of ecological UHPC. The aggregate size of different particle sizes has little effect on the durability of UHPC, and the strength loss rate is about 12%. After freezing and thawing, the splitting tensile strength loss rate of the split specimens is 8.8%~23.3%, and the strength loss rate of the steam curing specimens is relatively low.

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