改性活性粉末混凝土的力学性能

S. Collepardi, L. Coppola, R. Troli, M. Collepardi
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引用次数: 163

摘要

原始活性粉末混凝土(RPC) -以硅灰、钢纤维和磨碎的细石英的超塑水泥混合物的形式与改性RPC进行了比较研究,其中使用分级天然骨料(最大尺寸为8毫米)来取代细砂和/或部分胶凝粘合剂。原始RPC和改良RPC在塑性流体稠度下制造,通过振动浇铸并在三种不同条件下固化:a)室温;b) 90℃蒸汽养护;c) 160℃高压蒸汽养护。如果水泥基质的水灰比不改变,则级配骨料的加入不会降低抗压强度。这一结果与提出的RPC高抗压强度水平(200mpa)与不含粗骨料的模型相反。原始和改性RPC(添加粗骨料)在蒸汽固化而不是室温固化时表现更好-在更高的强度和更低的干燥收缩或蠕变应变方面。这种改善与水泥基体的更致密的微观结构有关,特别是在160℃蒸汽固化的RPC试件中。本研究的主要目的是对RPC进行改性,包括混合料中的一些粗骨料,并研究粗骨料对水泥混合物性能的影响,包括所需的混合水、抗压和抗弯强度、收缩、膨胀和蠕变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mechanical Properties of Modified Reactive Powder Concrete
Original Reactive Powder Concrete (RPC) - in form of a superplasticized cement mixture with silica fume, steel fibers and ground fine quartz was studied in comparison with a modified RPC where a graded natural aggregate (max size 8 mm) was used to replace the fine sand and/or part of the cementitious binder. Original and modified RPC were manufactured at a plastic-fluid consistency, cast by vibration and cured at three different conditions: a) room temperature; b) steam-curing at 90 C; c) high pressure steam-curing at 160C. The addition of the graded aggregate does not reduce the compressive strength provided that the quality of the cement matrix, in terms of its water-cement ratio, is not changed. This result is in contrast with the model proposed to relate to high compressive strength level of RPC (200 MPa) to the absence of coarse aggregate. Both the original and modified RPC (with coarse aggregate addition) perform better - in terms of higher strength and lower drying shrinkage or creep strain - when they are steam cured rather than cured at room temperature. This improvement was related to a more dense microstructure of the cement matrix, particularly in the RPC specimens steam cured at 160 C. The main purpose of the present investigation was to modify RPC including some coarse aggregate in the mixture and to study the influence of the coarse aggregate on the properties of cement mixtures in terms of required mixing water, compressive and flexural strength, shrinkage, swelling and creep.
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