A new study presents an optimised design method in developing ultra-high performance concrete (UHPC) with high wet packing density, in which the multiply effects of solid and liquid phases on UHPC packing mode are considered.

An optimised design approach for UHPC is proposed and demonstrated in a recently published paper. Source: MichaelGaida / Pixabay.

Specifically, a model based on D-optimal method is firstly established to assess the influence of solid granular particles and superplasticizer (SP) on the UHPC packing density. Based on the theoretical analysis, the mixture proportions can be optimised, and UHPC with high wet packing density could be produced. Then, to evaluate the reliability of the math-physical method in developing UHPC, its compressive strength and pore structure are tested.

The obtained experimental results show that the designed UHPC contributes high packing density, leading to optimised pore structure and extraordinary compressive strength. The experimental verification further highlights that D-optimal method is a promising and effective approach to design UHPC, and eventually for the development of sustainable UHPC.

The study is published in: Cement and Concrete Research Volume 126, December 2019, 105921.

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