Fly ash and limestone in diatomite-blended Portland cement

Abstract

The aim of the present study was to investigate the use of diatomite, which has limited use in the cement industry due to its porous structure in spite of its high reactive silica content, by modifying its porous structure with fly ash and limestone blend. To this end, physical, chemical, mineralogical and zeta potential (electrokinetic) analyses were performed on raw materials. Hydration progress was followed by using standard cement tests and X-ray, and 28-day microstructures of pastes were determined by scanning electron microscopy. Raw material test results have revealed that the particle structure of the raw materials affects the grindability of composite cements, while the Si-O− content in the zeta potentials makes it negative, and the Ca2+ content makes it positive. Standard cement test results indicate that water demand and setting time of pastes were related to diatomite ratio, and fly ash and filler limestone affected the development of strength by their electrokinetic properties.

Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment

“…It is also reported to have high use value as an admixture material for concrete [20,21]. In this regard, there is a report [22,23] that the compressive strength and flexural strength of concrete were the best when diatomite and yellow clay were used instead of 10% of the cement mass. In recent years, calcined diatomite has been used as a concrete admixture to reinforce the durability of concrete and increase strength efficiency.…”

“…cement mass. It is said that the strength of the hardened body is reduced [23]. In recent years, calcined diatomite has been used as a concrete admixture to reinforce the durability of concrete and increase strength efficiency.…”

Natural and Calcined Clayey Diatomite as Cement Replacement Materials: Microstructure and Pore Structure Study

“…The late compressive strength of most diatomite cements was improved compared to that of the reference cement [5]. Standard cement test results indicate the water demand and the setting times of the pastes were related to diatomite ratio [6] Calcination changed the porous structure of diatomite and rendered the grindability easier providing it to be used as a cement addition and suggested its use with substitution rate higher than 20 wt. % in this work [7].…”

Preparation of Puzzolana Active Two Component Composite for Latent Heat Storage

“…Moreover, the microfiller effect depends mainly on the shape and size of the particles, the particle size distribution, and specific surface area. These properties make diatomite applicable material for partial Portland cement substitution or additive in cement-based materials [26]. For example Ergun [27] measured improved mechanical properties of conventional concrete mixtures with partial cement replacement by diatomite using superplasticizing admixture.…”