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Thursday, 17 October 2019
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Raw materials & technologies, Technologies

Effect of key mixture parameters on the properties of reactive powder concrete

Thursday, 24 September 2015

The main objective of a study was to examine the effect of key factors, which affect the performance of reactive powder concrete (RPC) mixtures.

The modulus of rupture and modulus of elasticity of RPC correlated to its compressive strength. Source: Wilhelmine Wulff/pixelio.de

The modulus of rupture and modulus of elasticity of RPC correlated to its compressive strength. Source: Wilhelmine Wulff/pixelio.de

Firstly, an optimum sand grading was selected based on the maximum compressive strength and acceptable flow of a typical RPC mixture keeping the proportions of its ingredients constant. Then, keeping the sand grading and fiber content constant at their optimum levels, a total of 27 mixtures of RPC were selected for study by considering three levels of the three key factors namely water-to-binder ratio, cement content and silica fume content, according to a 33 factorial experiment design.

Producing optimum mixtures of RPC

The dosage of superplasticiser for each mixture was optimised to keep the flow in the desirable range of 180–220 mm. The performance of the selected mixtures of RPC was evaluated in terms of compressive strength, modulus of rupture and modulus of elasticity. Statistical analysis of the experimental data indicated the significant effect of sand grading, water-to-binder ratio, cement content and silica fume content on flowability and mechanical properties of RPC. The regression equations were obtained for mechanical properties of RPC mixtures in terms of the key mixture parameters, which can be utilised to optimise the proportions of RPC mixtures within the ranges of the mixture variables considered in this paper.

The study is published in: Construction and Building Materials, Volume 99, 30 November 2015, Pages 73-81

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