Effect of Saturated Tea Waste and Perlite Particles on Early Age Hydration of High-Strength Cement Mortars

Abstract

The main purpose of this work is to study the effect of saturated black tea waste and perlite on controlling the rapid heat of hydration in high-strength cement mortars at early ages. Tea waste and perlite were investigated as internal curing agents in different mixes. Mortar specimens with two different sizes of tea waste and perlite particles with 1 and 3% by volume of cement were added in different mixes to find their effect on early age hydration. The rising interior temperature, setting times, and strength parameters were evaluated. Results showed that the mix specimens that contained 3% tea waste and perlite particles significantly delayed the hydration process by minimizing internal temperature and extended setting times of different specimens. However, their usage had a slightly adverse impact on compressive and flexural strengths. It was observed that the specimens made with coarser particles of tea waste and perlite were more helpful to control early age rapid hydration than the specimens made with finer particles, whereas the specimens made with finer particles had slightly higher strengths than the specimens made with coarser particles. Hence, the coarser particles are recommended to be used in high-strength mortars to mitigate the early age rapid heat of hydration.

Prevention of Autogenous Shrinkage in High-Strength Mortars with Saturated Tea Waste Particles

“…Liu et al [46] reported a reduction in strength of cenosphere-containing mortars at the early ages compared to control mixes. Jakhrani et al [26] used tea waste and perlite particles in high-strength mortars to control early age hydration and heat release rates. They found a reduction in compressive strengths as compared to the control mix after curing for 3 days.…”

“…From the evaluation of compressive strength test results, it is established that the addition of tea waste particles reduces the compressive strength of specimens, however, a gain in strength increases with the passage of time. More gain is found in the specimens that contained tea waste and perlite particles with the addition of silica fume [26].…”

“…Before making the mortar specimens for all 18 mixes, all mortar ingredients are batched in the laboratory in dry or liquid form, depending on the nature of materials. Mixing for each mix is performed separately, using a small mixer with a capacity of 5 L. The mixing method for the first 9 mixes was similar as followed in our previous research work [26]. The difference in mixing of the remaining 9 mixes as compared to the previously made 9 mixes was the partial replacement of OPC with SF.…”

“…In this way their densities and absorption abilities were checked. The absorption ability was measured using Equation (1), given in [26]:Absorption(%)=(WSSD−WODWOD)×100Absorption(%)=(WSSD−WODWOD)×100…”

“…Lura et al [25] used biomass-derived waste material and considered it as a lightweight aggregate. Jakhrani et al [26] used saturated black tea waste and perlite particles as internal curing agents to control rapid hydration in high-strength mortars. The use of agro-based waste material as building material was also suggested by [27].…”