Strength development of lime–pozzolana pastes with silica fume and fly ash

Koteng, David Otieno; Chen, Chun-Tao

doi:10.1016/j.conbuildmat.2015.03.052

Cited by 42 publications

(13 citation statements)

References 14 publications

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“…The heat of hydration ( Figure 5 ) also confirmed this chemical reaction. Previous research on fly ash with natural hydraulic lime has shown 7 MPa of 28 days compressive strength under water curing conditions at 20 °C [ 7 ]. However, the compressive strength of these two fly ash systems for use as structural materials are still not as good as normal OPC-based concrete (20–40 MPa at 28 days).…”

Section: Discussionmentioning

confidence: 99%

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Acceleration of Intended Pozzolanic Reaction under Initial Thermal Treatment for Developing Cementless Fly Ash Based Mortar

et al. 2017

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Without using strong alkaline solution or ordinary Portland cement, a new structural binder consisting of fly ash and hydrated lime was hardened through an intensified pozzolanic reaction. The main experimental variables are the addition of silica fume and initial thermal treatment (60 °C for 3 days). A series of experiments consisting of mechanical testing (compressive and flexural strength, modulus of elasticity), X-ray diffraction, and measurements of the heat of hydration, pore structure, and shrinkage were conducted. These tests show that this new fly ash-based mortar has a compressive strength of 15 MPa at 91 days without any silica fume addition or initial thermal treatment. The strength increased to over 50 MPa based on the acceleration of the intensified pozzolanic reaction from the silica fume addition and initial thermal treatment. This is explained by a significant synergistic effect induced by the silica fume. It intensifies the pozzolanic reaction under thermal treatment and provides a space filling effect. This improved material performance can open a new pathway to utilize the industrial by-product of fly ash in cementless construction materials.

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Section: Discussionmentioning

confidence: 99%

“…As an alternative, there has been research focusing on replacing a part of OPC with fly ash or ground granulated blast-furnace slag [ 6 , 7 ]. Fly ash is being used as a supplementary cementitious material due to its pozzolanic or cementitious characteristics.…”

Section: Introductionmentioning

confidence: 99%

Acceleration of Intended Pozzolanic Reaction under Initial Thermal Treatment for Developing Cementless Fly Ash Based Mortar

et al. 2017

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“…During the manufacturing of PC, the sustainability of the environment is highly threatened with high energy usage and raw materials, and massive volumes of CO2 emissions. In order to minimize these serious complications, PCs should be blended with pozzolanic materials [4,5]. In concrete, high amounts of by-products that generated in the manufacturing process may be used as additional mineral, which can be regarded as additional supplementary cementitious materials (SCMs), having proper quality control.…”

Section: Introductionmentioning

confidence: 99%

“…In concrete, high amounts of by-products that generated in the manufacturing process may be used as additional mineral, which can be regarded as additional supplementary cementitious materials (SCMs), having proper quality control. The application of these materials provides significant environmental and economic benefits such as reduction in the emissions of contaminating gases [7,8] and decrease in the quantity of usual resources [4] that are resultant from the processing of Portland cement.…”

Section: Introductionmentioning

confidence: 99%

Effects of nanosilica to improve the mechanical, electrical and durability properties of fiber-reinforced high-volume processed sugarcane bagasse ash cement mortar

Gopalakrishnan

Kaveri

JohnKirubahar

2021

Preprint

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Nanosilica (NS) has attracted wide variety of usage as cement ingredients. While many other studies have focused on early cement hydration and hardening properties, there is less data available on the impact of NS on the behavior of fiber-reinforced high-volume sugarcane bagasse cement mortar (HVSCBAM). The effects of NS on the fiber-reinforced durability of HVSCBAM, having the properties of sugarcane bagasse ash/binder in an average of 50% by weight, have been presented in detail in this study. Four NS/binder weight ratio dosages of 0%, 0.5%, 1.0% and 1.5% of and another four total PVA fiber/volume ratio dosages of 0%, 0.2%, 0.5% and 1.0% were used. Compared to 0.2-1 vol.% of PVA fiber–reinforced HVSCBAM, the 1.5 wt.% of NS would enhance the compressive strength further. Various reports on mineralogy and microstructure have demonstrated that NS facilitates fiber/matrix bonding. These conclusions provide an insight into the pozzolanic materials of cement that are used in a large volume in the designs and applications of nanoparticles.

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“…The researches have shown that replacement of a portion of cement with some Pozzolanic additive materials decreases the hydration temperature and its resulting crack and also reduces the shrinkage. Stable construction with the aim of saving energy, resources and costs and also reducing the destructive environmental effects are some advantages of using these kinds of additives [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Mechanical Properties and Durability of Concrete Containing Silica Fume and Fly Ash

2016

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Nowadays pozzolans are used vastly in civil projects. Pozzolan is a natural or artificial material containing active silica that increase the strength and improves some properties of concrete. In this survey for investigating some important properties of concrete, silica fume and fly ash was used in replacement of cement in different weights. Concrete compositions were made with water-cement ratio of 0.45 and cured under the same conditions. The main focus of this survey is to investigate the individual and combined effect of using Pozzolan on mechanical properties, permeability and shrinkage of concrete. The mechanical properties of concrete in compressive and bending strength at the age of 7, 28 and 90 days, were evaluated. Permeability was investigated with the water absorption test. The drying shrinkage of concrete was monitored for 90 days. Scanning Electron Microscopy (SEM) images was used in concrete cement based matrix morphology. The results showed that the addition of pozzolan increases the mechanical strength and reduce permeability and increase the drying shrinkage in some mixtures.

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Strength development of lime–pozzolana pastes with silica fume and fly ash

Cited by 42 publications

References 14 publications

Acceleration of Intended Pozzolanic Reaction under Initial Thermal Treatment for Developing Cementless Fly Ash Based Mortar

Acceleration of Intended Pozzolanic Reaction under Initial Thermal Treatment for Developing Cementless Fly Ash Based Mortar

Effects of nanosilica to improve the mechanical, electrical and durability properties of fiber-reinforced high-volume processed sugarcane bagasse ash cement mortar

An Investigation on Mechanical Properties and Durability of Concrete Containing Silica Fume and Fly Ash

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