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fly ash pastes mechanical

Influence of calcium compounds on the mechanical

Aug 15, 2009· The influence of calcium compounds (CaO and Ca(OH) 2) on the mechanical properties of fly ash based geopolymers has been studied.Calcium compounds were substituted in fly ash at 1, 2 and 3 wt%, respectively. Curing of the geopolymers was performed at

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Geopolymer Paste an overview ScienceDirect Topics

R.R. Lloyd, in Geopolymers, 2009. 8.6.4 The effect of zeolite crystallisation on strength of fly ash geopolymers. The samples examined thus far have demonstrated that zeolite crystallisation can occur in fly ash geopolymer pastes activated in the presence of dissolved silica, but that this is not accompanied by major strength loss. It is important to note, however, that the amount of zeolite

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Experimental Investigation on Mechanical Properties of In

Cemented paste backfill containing coal gangue and fly ash (CGFACPB) is an emerging backfill technique for coal mines that allows environmentally hazardous coal gangue and fly ash to be reused in the underground goaf. Meanwhile, CGFACPB can provide an efficient ground support and reduce the surface subsidence. Due to the difference of consolidation environment between the laboratory and

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Mechanical properties and microstructure of magnesia–fly

their quantitative data on the mechanical properties of reactive MgO–fly ash pastes that can be. (OH) 2 and M-S-H are primarily detected in reactive MgO-activated fly ash paste. To

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(PDF) Influence of calcium compounds on the mechanical

The influence of calcium compounds (CaO and Ca(OH)(2)) on the mechanical properties of fly ash based geopolymers has been studied. Calcium compounds were substituted in fly ash at 1, 2 and 3 wt

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Frontiers Mechanical-Chemical Activation of Coal Fly

Mechanical strength of alkali-activated paste prepared with ground or unground coal fly ash and cured for 20 h at 85°C. The starting ashes and reaction products were characterized by XRD, scanning electron microscopy (SEM/EDX) and NMR.

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Fly ash and ground granulated blast furnace slag-based

J. Temuujin, A. Van Riessen, R. WilliamsInfluence of calcium compounds on the mechanical properties of fly ash geopolymer pastes J. Hazard. Mater., 167 (2009), pp. 82-88

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Mechanical and microstructure characteristics development

(2020). Mechanical and microstructure characteristics development of hardened oil well cement pastes incorporating fly ash and silica fume at elevated temperatures. Journal of Taibah University for Science: Vol. 14, No. 1, pp. 155-167.

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(PDF) Mechanical and physical properties of metakaolin

This paper presents the result of studies on utilizing metakaolin obtained from Belitung as fly ash substitute material to produce geopolymer paste. Mechanical properties were assessed by

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Efflorescence and subflorescence induced microstructural

Sep 01, 2018· This study aims to provide new understanding of the changes in phase assemblage, microstructure and mechanical properties of fly ash-based geopolymer pastes through tests on samples with various fly ashes, activators and ageing/exposure conditions. 2. Experimental program 2.1. Materials

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MECHANICAL AND MICROSTRUCTURAL PROPERTIES OF THE

The results have shown that the mechanical properties of the fly-ash-based geopolymer paste and mortar greatly depend on the reaction parameters of the geopolymerization process. Depending on the reaction parameters, the compressive strength of fly-ash-based geopolymers may be considerably increased with an addition of sand.

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Mechanical properties of geopolymer paste with fly ash

Oct 26, 2016· This paper presented mechanical properties of geopolymer paste with fly ash variation. Mechanical properties were assessed by compressive and setting time test. Fly ashes were obtained from three different places namely Paiton, PT Petro Kimia Gresik (PKG) and Fly Ash were sold in the local market of Malang.

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Mechanical Properties and Microstructure of Class C Fly

This study considers mechanical properties and microstructure of class C fly ash-based geopolymer paste and mortar. 2. Experimental Test 2.1. Materials Class C fly ash (CFA) used in this study was obtained from Harbin Acheng Suibao Thermoelectric Power Plant, China. Chemical composition of fly ash precursor is 48.2% SiO2, 18.4% Al2O3

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Influence of Fly Ash on Mechanical Properties and

This paper aimed to report the effects of fly ash (FA) on the mechanical properties and hydration of calcium sulfoaluminate-activated supersulfated cement (CSA-SSC). The CSA-SSC comprises of 80% granulated blast furnace slag (GBFS), 15% anhydrite, and 5% high-belite calcium sulfoaluminate cement (HB-CSA) clinker. The hydration products of CSA-SSC with or without FA were investigated by X-ray

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Mechanical Treatment of MSWI Fly Ash: A Way Forward to

Fly ash from municipal solid waste incinerators has been classified as hazardous waste due to the presence of unintentionally-produced Persistent Organic Pollutants (POPs), with Polychlorinated biphenyls (PCB) being a major group among such POPs. Fly ash can be mechanically (MC) treated to destroy organic pollutants before final disposal or reuse. In this study, model fly ash (MFA) doped with

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Physico-mechanical characterization of high-volume fly ash

The current annual worldwide production of coal ash is estimated at one billion tons of which at least 70-75 % is fly ash. A huge amount of such wastes can seriously damage the environment and ecology of the planet. In this study, a high volume of fly ash was used to produce environmentally friendly building products. The composites were designed as pure cement, and as a result, no aggregates

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Variation of Material Properties of Cement Pastes with

Cement-Fly Ash Ratio, Maturation of Cement Paste. 1 Introduction The compressive strength and the tensile strength, elastic modulus and fracture energy are important and interesting material properties. Changes in the properties of cement paste [1] with fly ash to pure cement paste can be documented on those parameters.

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Effect of Mechanical–Chemical Modification Process on

As a new modification method, mechanochemistry features the remarkable advantages of simple operation process, low energy consumption, easy chemical modification, and suitability for industrialization. In this work, the coal-fired byproduct fly ash was modified by a mechanical–chemical method through omnidirectional planetary ball mill. The effect of the mechanical–chemical

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Study on the physical and mechanical property of ordinary

Table 3 represents the mixture proportion of different fly ash-cement pastes. The control mixture without fly ash has been marked as F0 and 20 to 70% OPC have been replaced by fly ash and marked as F20 to F70 respectively. The water- binder ratio was kept constant at 0.3.

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Fly ash Wikipedia

Fly ash or flue ash, also known as pulverised fuel ash in the United Kingdom, is a coal combustion product that is composed of the particulates (fine particles of burned fuel) that are driven out of coal-fired boilers together with the flue gases.Ash that falls to the bottom of the boiler's combustion chamber (commonly called a firebox) is called bottom ash.

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Mechanical Properties of Tunnel Muck with Fly-Ash Geopolymer

The tunnel muck has a great potential to be used as a recyclable engineering material in transit and other civil work projects instead of being deposited as construction waste. In this work, the geopolymer is generated by alkali-activated fly ashes, which act as cementitious materials to strengthen the tunnel muck. The tunnel muck has to be dehydrated, grinded, and screened before being

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Minerals Free Full-Text Synthesis of Fly Ash-Based

Blends of fly ash and natural calcite, mechanically activated for 0–400 s in a planetary mill, were used to synthesize geopolymers at ambient temperature. The calcite content in the blends was 0–10 wt.%. Sodium hydroxide solution was used as an alkaline agent. Mechanical activation of the raw material considerably enhanced its reactivity with respect to the alkaline agent, as was observed

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Data for the physical and mechanical properties of high

Nov 16, 2017· The dataset presented herein were obtained from the physical and mechanical tests of various amounts of ASTM Class C and Class F fly ash, silica fume, lime and water reducers to produce high volume fly ash (HVFA) cement paste composites. The data provides in this article composed of pure cement paste composites.

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Fresh and Hardened Properties of Fly Ash–Slag Blended

Aug 29, 2019· Available literatures on geopolymer cement are summarised and discussed. Puertas et al. concluded that the activator concentration and the slag content showed significant impact on strength development, whereas the effect of curing temperature is minimal while assessing the mechanical behaviour of sodium hydroxide activated fly ash/slag paste.. Temuujin et al. (2009a, b) assessed the

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