Results 31 to 40 of about 7,806 (221)

The Potential to Replace Cement with Nano-Calcium Carbonate and Natural Pozzolans in Cemented Mine Backfill

open access: yesAdvances in Civil Engineering, 2021
The effectiveness of mine backfilling depends on the properties of its constituents. The high cost of cement, which is commonly used as a binder in mine backfill, has led researchers to seek alternatives to partially replace it with other binders.
Mohammed Hefni, Maaz A. Ali
doaj   +1 more source

Corrosion Behavior of Steel Reinforcement in Concrete with Recycled Aggregates, Fly Ash and Spent Cracking Catalyst [PDF]

open access: yes, 2014
The main strategy to reduce the environmental impact of the concrete industry is to reuse the waste materials. This research has considered the combination of cement replacement by industrial by-products, and natural coarse aggregate substitution by ...
Baeza Brotons, Francisco   +4 more
core   +2 more sources

Heats of hydration and pozzolan content of portland-pozzolan cements

open access: yesJournal of Research of the National Bureau of Standards, 1952
Methods are described for the measurement of the approximate heat of solution in acid of portland-cement^-pozzolan mixtures. Examples are given of the estimation of the heat of hydration of portland-pozz olan cements. Determinations of the amount of material undissolved in the calorimeter, as well as the heats of solution, were applied to the problem ...
E.S. Newman, L.S. Wells
openaire   +1 more source

Analysis of thermal process of pozzolan production

open access: yesMateriales de Construccion, 2004
The objective of this study was evaluated the effect of heat treatment parameters on the pozzolanic activity of natural kaolin clays. The experimental design included three factors: kaolin type, temperature and time.
R. Mejía De Gutiérrez   +2 more
doaj   +1 more source

Some considerations about the use of lime-cement mortars for building conservation purposes in Portugal : a reprehensible option or a lesser evil? [PDF]

open access: yes, 2012
Some investigations about conservation actions in historical buildings points out that lime–cement mortars should be avoided and lime–pozzolan mortars should be use instead.
Faria, Joana   +2 more
core   +1 more source

Carbonation of concrete with construction and demolition waste based recycled aggregates and cement with recycled content [PDF]

open access: yes, 2020
Durability is a major concern in concrete (particularly recycled concrete) structures exposed to carbonation-induced corrosion, given the social, economic, environmental and safety implications involved.
De Belie, Nele   +4 more
core   +1 more source

Effects of the secondary minerals of the natural pozzolans on their pozzolanic activity

open access: yesCement and Concrete Research, 2008
Abstract Natural pozzolans have been widely used as substitutes for Portland cement, because of their binding properties. Some of them are natural volcanic rocks which contain secondary minerals such as clays and zeolites corresponding to products of the alteration of the rock.
Habert, Guillaume   +4 more
openaire   +3 more sources

Pozzolanic Effect on the Hydration Heat of Cements Incorporating Fly Ash, Obsidian, and Slag Additives

open access: yesAdvances in Civil Engineering, 2021
Made up of an engineered mix of ordinary Portland cement (OPC) with artificial pozzolans such as trass, fly ash, and slag, the blended cements have been intensely employed within cementitious materials.
Ilker Ustabas   +3 more
doaj   +1 more source

Application of power ultrasound to cementitious materials: Advances, issues and perspectives [PDF]

open access: yes, 2018
Novel techniques such as power ultrasound (PUS) are currently under consideration to improve the hydration of cementitious materials and to promote the effectiveness of replacing supplementary cementitious materials; SCMs, in terms of mechanical ...
Akkaya   +88 more
core   +1 more source

Use of gypsum and bagasse ash for stabilization of low plastic and high plastic clay

open access: yesJournal of Applied Research on Industrial Engineering, 2019
Clays have a tendency to undergo volumetric changes when they interact with water. These soils are a very common reason for most of the foundation failures due to their degraded properties.
Sadam Hussain Khan
doaj   +1 more source

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