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The influence of ingredients on the properties of reactive powder concrete: A review
Ain Shams Engineering Journal ( IF 6.0 ) Pub Date : 2020-09-25 , DOI: 10.1016/j.asej.2020.07.016
Ola A. Mayhoub , El-Sayed A.R. Nasr , Yehia A. Ali , Mohamed Kohail

Reactive Powder Concrete is a type of ultra-high-performance concrete. Improvement of microstructure, elimination of coarse aggregate, particle packing, and toughness enhancement are the main principles of RPC development. To achieve these principles, RPC is characterized by the inclusion of high cement content and pozzolanic materials that make in the other hand its production highly cost and non-environmentally friendly. This work reviewed the principals of developing RPC, the constituent materials, curing techniques and the constituent percentages that affect the compressive strength. The improvement of concrete microstructure, particle packing and toughness properties of RPC are briefly outlined along with the incorporated constituent materials. Curing techniques and the mixture design of RPC are also clearly highlighted.

In this study, the impact of using different percentages of the constituent materials of RPC and their available alternatives on compressive strength under different curing regimes are presented. It was showed that curing of RPC considered to be very important aspect in its development as it significantly affects the reactivity of its constituent. It was noticed that applying autoclave curing and using low cement dosage can achieve higher compressive strength results than applying steam curing. It was concluded also that the enhancement percentage in compressive strength can reaches 33% when using fly ash with 40% cement replacement under autoclave curing. It was observed that the enhancement percentage in compressive strength can reaches 45% when using rice husk ash with 30% silica fume replacement under steam curing Volumetric changes are considered the main problematic properties that prevent the wide use of RPC. Verifications are required to clarify mixing different quartz powder to quartz sand and its impact on RPC compressive strength by studying its microstructure.



中文翻译:

配料对活性粉末混凝土性能的影响:综述

活性粉末混凝土是一种超高性能混凝土。改善微观结构,消除粗骨料,颗粒堆积和提高韧性是RPC发展的主要原则。为了实现这些原理,RPC的特点是包含高水泥含量和火山灰材料,另一方面,其生产成本高且对环境不友好。这项工作回顾了开发RPC的原理,组成材料,固化技术以及影响抗压强度的组成百分比。简要概述了RPC的混凝土微观结构,颗粒堆积和韧性等方面的改进,以及掺入的组成材料。RPC的固化技术和混合设计也很明显。

在这项研究中,提出了使用不同百分比的RPC组成材料及其可用替代物对不同固化方案下的抗压强度的影响。结果表明,RPC的固化被认为是其发展中非常重要的方面,因为它会显着影响其组分的反应性。注意到,与进行蒸汽固化相比,进行高压釜固化和使用低水泥用量可以获得更高的抗压强度结果。还得出结论,在高压釜固化下使用粉煤灰和40%水泥替代物时,抗压强度的提高百分比可以达到33%。观察到,在蒸汽固化下使用30%硅粉替代的稻壳灰时,抗压强度的提高百分比可以达到45%。体积变化被认为是阻止广泛使用RPC的主要问题。通过研究其微结构,需要进行验证以澄清将不同的石英粉混入石英砂及其对RPC抗压强度的影响。

更新日期:2020-09-25
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