Physico-Mechanical Properties and Hydration Processes of Cement Pastes Modified with Pumice, Trass and Waste Chalcedonite Powder

Materials (Basel). 2023 Dec 31;17(1):236. doi: 10.3390/ma17010236.

Abstract

In this article, the physico-mechanical properties and hydration processes of cement pastes containing three additives are introduced. Cement was replaced with pumice, trass, waste chalcedonite powder at 30% by mass and a combination of pumice or trass and waste chalcedonite powder in the amounts of 15% each. The main aim of this research was to assess the properties of two- or three-component binders to save cement in these binders. Rheological properties such as consistency, yield stress, viscosity and thixotropy were determined, in addition to porosity, 7-day and 28-day flexural and compressive strength and bulk density. Additionally, the heat evolution and degree of hydration of the tested pastes were compared. The use of all additives resulted in a reduction in the consistency of the tested pastes. The highest compressive strength measured after 28 days was observed for the cement paste with a 30% content of waste chalcedonite powder, which is related to it having the best pozzolanic activity of the materials used. The results of this research have confirmed that pumice, trass and waste chalcedonite powder can be used as components of blended Portland cements.

Keywords: additive; cement paste; compressive strength; consistency; hydration process; pumice; reduce CO2; rheological measurements; trass; waste chalcedonite powder.

Grants and funding

This research was funded by a program of the Minister of Science and Higher Education under the Regional Initiative of Excellence in 2019–2022 (project number 025/RID/2018/19; financing amount PLN 12.000.000). The research was also supported by the Czech Science Foundation under project No 21-06582S.