Preparation of C30 Concrete Using Lead-Zinc Tailings

Abstract

This paper examines the feasibility of preparing C30 concrete with replacing part of cementitious materials with lead-zinc tailings (LZT). The optimal fineness of LTZ is determined based on fineness measurement of the ground powder and the strength tests of mortars. C30 concrete is mixed partially replacing cement, fly ash (FA) and ground blast furnace slag (GBFS) with the LTZ with the optimal fineness, respectively. The related properties of the concrete are measured. The concrete with LTZ partially replacing cement, FA or GBFS can meet the requirements of C30 pump concrete. The concrete with LTZ shows good durability. Based on the results of permeability, carbonation resistance and autogenous shrinkage tests, it indicates that the ground LTZ show good micro-filler effect and pozzolanic reactivity in concrete since more than 60 % particles of LTZ is smaller than 5 µm.