Hydration characteristics of cement with high volume circulating fluidized bed fly ash

Zheng, Dapeng; Wang, Dongmin; Cui, Hongzhi; Chen, Xiangsheng

doi:10.1016/j.conbuildmat.2023.131310

Cited by 12 publications

(3 citation statements)

References 39 publications

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“…Generally, the heat evolution rate of all the mixtures increased to peak values and then decreased to low equilibrium values within one hour at which the hydration of cement enters the dormant period. As reported [40,41], this initial period referred to the dissolution period of the most reactive component such as tricalcium silicate within the cementitious binders. It can be observed from the figure that replacing cement with WGP from 0% to 60% gradually decreased the dissolution peak of the printing mixtures from 14.7 mW/g to 11.4 mW/g.…”

Section: Heat Of Hydrationmentioning

confidence: 86%

“…It can be observed from the figure that replacing cement with WGP from 0% to 60% gradually decreased the dissolution peak of the printing mixtures from 14.7 mW/g to 11.4 mW/g. This is because the addition of WGP reduced the tricalcium silicate contents in the printing mixtures [40]. Since the dissolution period was within the printability window of the printing mixtures, this can thereafter be utilized to explain the effect of WGP on workability and rheology.…”

Section: Heat Of Hydrationmentioning

confidence: 99%

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Development and Characteristic of 3D-Printable Mortar with Waste Glass Powder

et al. 2023

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Three-dimensional concrete printing (3DCP) is emerging as an innovative technology and shows promise to revolutionize conventional construction modes. However, the current 3D-printed concrete (3DPC) generally requires higher cement content than conventional concrete to ensure its rheology for printing. From the perspective of cleaner production and reduce carbon emissions, this study explored the feasibility of replacing parts of cement with waste glass powder (WGP, 0%, 20%, 40%, and 60% by mass) and compared the properties of the developed 3DPC, including fluidity (flowable spread), rheology, heat of hydration, buildability, compressive strength, anisotropy, and drying shrinkage. The results showed that less than 40% WGP replacement had limited influence on the initial fluidity and static yield stress, as well as drying shrinkage, of 3DPC. Although the WGP inclusion decreased the compressive strength, it slowed down the fluidity loss and static yield stress increase, which could extend the workable time of the mixture for printing and improve buildability. The 40% WGP replacement was found increase to the buildability of the printing mixture from 150 mm to 155 mm. The printing mixture prepared with 60% WGP reduced the dying shrinkage by 50%. An exponential decay function between the fluidity and static yield stress was established so that the simple fluidity test could be used as an indicator of printability. The findings in this study provided a solution to reduce the consumption of cement in 3DPC, which could contribute to a greener production in the construction industry.

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Section: Heat Of Hydrationmentioning

confidence: 86%

Section: Heat Of Hydrationmentioning

confidence: 99%

Development and Characteristic of 3D-Printable Mortar with Waste Glass Powder

et al. 2023

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“…Modern environmental conditions necessitate the reduction Materials 2023, 16, 3013 2 of 16 of greenhouse gas emissions and the use of additives helping to reduce emissions of these gases. Granulated blast furnace slag and siliceous fly ash are the best known and widely used Portland clinker supplements [24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Modifying Water–Frost Resistance and Mechanical Properties of Lime Mortar Using Siliceous and Fluidised Bed Fly Combusted Ashes Activated with Cement

2023

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The research focuses on pozzolanic additives, which are compatible with traditional lime mortars, and enable the modification of the rheological, physical and mechanical properties of tested composites. It was noted that lime mortars with fluidised bed fly ash require sand without impurities to avoid possible ettringite crystallisation. The work presents siliceous fly ash and fluidised bed combustion fly ash to modify the frost resistance and mechanical properties of traditional lime mortars with and without the addition of cement. The results show better effects using fluidised bed ash. Traditional Portland cement CEM I 42.5R was used to activate ash and increase the results. The possibility of a significant improvement of properties is indicated with a hybrid addition to the lime binder of 15–30% ash (siliceous or fluidised bed ash) and 15–30% cement. Changing the class and type of cement provides an additional opportunity to alter the properties of the composites. For architectural reasons relating to colour, the suitability of lighter fluidised bed ash instead of darker siliceous ash and of white Portland cement instead of the traditional grey cement can be used. The proposed mortars can be the basis for future modifications with admixtures and additives, e.g., metakaolin, polymers, fibres, slag, glass powder and impregnating agents.

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Investigation of physicochemical processes taking place in chemically activated very high volume fly ash mixtures

Wilińska

2023

Construction and Building Materials

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Hydration characteristics of cement with high volume circulating fluidized bed fly ash

Cited by 12 publications

References 39 publications

Development and Characteristic of 3D-Printable Mortar with Waste Glass Powder

Development and Characteristic of 3D-Printable Mortar with Waste Glass Powder

Modifying Water–Frost Resistance and Mechanical Properties of Lime Mortar Using Siliceous and Fluidised Bed Fly Combusted Ashes Activated with Cement

Investigation of physicochemical processes taking place in chemically activated very high volume fly ash mixtures

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