Using ensemble model to predict isothermal hydration heat of fly ash cement paste considering fly ash content, water to binder ratio and curing temperature

Sun, Y.; Lee, H.S.

doi:10.1016/j.cscm.2023.e01984

Cited by 3 publications

(2 citation statements)

References 39 publications

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“…Afterward, approximately 1.8 g of the mixture was cast into ampoules and inserted into the calorimeter. Samples were temperature-equilibrated for 72 hr prior to the measurements [30][31][32][33].…”

Section: Thermal Analysismentioning

confidence: 99%

Study on the Performance and Green Degree Evaluation of the Reference Cement–Sulfoaluminate Cement Composite System

Shi,

Yuan

et al. 2023

Advances in Civil Engineering

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With the large-scale construction of infrastructure such as high-speed railways and the rapid development of building industrialization and prefabricated buildings, the precast concrete industry has ushered in vigorous vitality. However, there are many tricky problems such as high-energy consumption and unstable long-term performance in the existing production technology of steam-cured concrete. Based on the current research on concrete early strength technology, this paper focuses on the early strength performance and greenness evaluation of the reference cement–sulfoaluminate cement (C–SAC) system. The results confirm that when the 30% mineral admixture—60% C–10% SAC system is mixed with the composite early strength agent, the 1 day strength of mortar can reach 38.0 MPa under the condition of 45°C steam curing. The water absorption is 1.1% after 28 days. The carbon emission of the system (32.1%) is lower than that of the reference cement, and the production energy consumption and the initial resource energy are reduced by 14.4% and 8.2%, respectively. This paper provides a promising strategy for the development of low-carbon, and early strength concrete and ultimately provides technical support for the realization of high-quality and green production of precast concrete components.

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Section: Thermal Analysismentioning

confidence: 99%

Study on the Performance and Green Degree Evaluation of the Reference Cement–Sulfoaluminate Cement Composite System

Shi,

Yuan

et al. 2023

Advances in Civil Engineering

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“…Due to the low pozzolanic effect of FA, the reaction rate between FA and CH of cement hydration products is very slow within 7 days of hydration [9]. It reduces the hydration process of the FA-C (cement) system, resulting in low early mechanical properties [10]. With the excitation of the pozzolanic effect, the mechanical properties of the FA-C system are gradually improved.…”

Section: Introductionmentioning

confidence: 99%

Low-Field Nuclear Magnetic Resonance Investigation on Early Hydration Characterization of Cement Paste Mixed with Mineral Admixtures

Tang,

Shan,

Yin

et al. 2023

Buildings

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Mineral admixtures (MA), like fly ash (FA), silica fume (SF), and slag (S), are usually added to cement-based materials to improve their compactness and further enhance their mechanical properties, permeability resistance, and durability. In this study, low-field nuclear magnetic resonance (LF-NMR) is adopted to explore the evolution of the early hydration characterization of cement-based materials with MA by testing the transverse relaxation time T2. Meanwhile, the effect of MA on mechanical properties is analyzed by measuring compressive and flexural strength. The results show that, in the early hydration (0–7 days), the T2 distribution shows a trend of gradually moving to a short relaxation time and changes from a double peak to a single main peak. The decrease in T2i (main peak vertex) means that the evaporated water is gradually distributed in smaller pores with more motion constraints. However, the type and content of MA have little effect on T2i. Porosity gradually decreases in the period of early hydration. The addition of MA causes the porosity to decrease, and the order influence is FA > S > SF, i.e., the porosities of cement paste with 0%MA, 10%FA + 10%SF, 10%FA + 10%S, and 20%FA at 7 days are 48%, 44.5%, 40.7%, and 40.2%, respectively. Additionally, the addition of MA to cement-based materials also decreases the early strength, and the influence order is FA > S > SF, i.e., the compression strength values of cement paste with 0%MA, 10%FA + 10%SF, 10%FA + 10%S, and 20%FA at 7 days are 47.8 MPa, 40.1 MPa, 38.6 MPa, and 37 MPa, respectively.

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Compressive Strength Analysis of Renewable Mortar after Portland Cement Replacement with Waste Ash

Syarif,

Nanda,

Nurnawaty

et al. 2024

Eng. Technol. Appl. Sci. Res.

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There are many environmental problems caused by factory waste. Sugar factory waste, in the form of bagasse ash, and PLTU factory waste, in the form of fly ash, are currently in the spotlight of science studies. This study used waste bagasse and fly ash to substitute Portland cement as the main ingredients for mortar. Baggash and fly ash waste were collected, processed, and then used to replace cement by up to 40% to determine to what extent they could be used in brick masonry work, wall plastering, and masonry paste. Experimental tests were carried out on mortar cube samples measuring 5×5×5 cm, comparing four types of samples consisting of Portland cement, bagasse ash, and fly ash. The compressive strength results were obtained after 28 days. Normal Mortar (MN=11.75 MPa) had higher compressive strength than the substitute mortar types MA (3.23 MPa), MB (3.09 MPa), and MC (2.98) MPa. According to SNI 6882-2014, MA, MB, and MC mortars can be used as O-type mortar (2.4 MPa). Therefore, they can be applied to wall plastering or walls not bearing loads.

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Using ensemble model to predict isothermal hydration heat of fly ash cement paste considering fly ash content, water to binder ratio and curing temperature

Cited by 3 publications

References 39 publications

Study on the Performance and Green Degree Evaluation of the Reference Cement–Sulfoaluminate Cement Composite System

Study on the Performance and Green Degree Evaluation of the Reference Cement–Sulfoaluminate Cement Composite System

Low-Field Nuclear Magnetic Resonance Investigation on Early Hydration Characterization of Cement Paste Mixed with Mineral Admixtures

Compressive Strength Analysis of Renewable Mortar after Portland Cement Replacement with Waste Ash

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