Effect of limestone powder on strength and permeability of cementitious mortars

Wei-Ting Lin,An Cheng,Robert Černý,T Tracz,K Mróz,T Zdeb

doi:10.1051/matecconf/202032201009

Wei-Ting Lin, An Cheng + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/202032201009

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Abstract

This study investigated the mechanical properties and durability of mortar specimens containing various quantities of waste limestone powder (0%, 10%, 20%, and 30% of the weight of cement). The mechanical properties were evaluated in terms of flowability, compressive strength, and splitting tensile strength. Permeability was evaluated in terms of resistivity, absorption, and rapid chloride penetration (total charge- passed). Test results revealed that replacing 10% of the cement with limestone powder improves both mechanical performance and durability. However, reducing the cement content reduced the availability of hydration products to fill the pores in the microstructure. The hydration product of limestone powder was mainly calcium hydroxide, which undermines the development of strength in the paste. Nonetheless, our results indicate that waste limestone powder is suitable for the partial replacement of cement.

Highlights

The processing of stone by cutting, carving, and grinding produces stone waste in the form of sludge with a composition similar to that of the original stone [1, 2]
It seems that the inclusion of limestone powder in cement-based composites can increase compressive strength; the magnitude of the improvements drops at replacement values exceeding 10%
This can presumably be attributed to reactions between the hydration products of limestone and cement resulting in greater porosity and a looser microstructure

Summary

Introduction

The processing of stone by cutting, carving, and grinding produces stone waste in the form of sludge with a composition similar to that of the original stone [1, 2]. This waste material has a potentially considerable economic value [3, 4]. The stone-processing industry in Taiwan is centred in the city of Hualien, where it generates an annual economic output of nearly 40 billion yuan Despite this enormous output, the efficiency of resource utilisation is somewhat limited [5, 6]. We examined the feasibility of using waste limestone powder as a replacement for cement in concrete

Materials and test procedures

Results and discussion

Conclusions