Recycling of Construction Waste Using High-Speed Milling Process: Determination of Waste Concrete

Abstract

This paper deals with the use of high-speed milling process for recycling old concrete and direct determination of the potential of input waste. For this purpose, three different types of waste concrete were used: prefabricated railway sleeper, structural concrete of monolithic pillar and prefabricated drainage gutter. The paper directly examines the chemical and phase composition by XRF, X-Ray Diffraction (XRD), Energy Dispersive X-ray Spectrometry (EDS) and microscopic analysis, particle size distribution and pH of the recycled material. Results of those analysis are used to select suitable recycled material. The suitability of choice is supported by mechanical tests of 28-day old cement pastes, where the compressive strength and dynamic modulus of elasticity are observed properties. Specimens measuring 40 × 40 × 160mm are composed of 70 wt.% Portland cement and rest is micronized concrete. In all cases, the results are compared with the reference material.

Micronized Concrete Powder as Mircofiller in Cement Paste: Influence on Hydration and Structure

“…% cause that small cement ratio to the total surface area of the added MCP prevails the microfiller function of MCP and leads to an increase in the total porosity and bulk density of the cement paste. Based on results published in other papers [4,7], the influence of residual content clinker in cement paste can be neglected due to the small amount of it.…”