Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System

Niu, Fujun; An, Yukun; Zhang, Jinxia; Chen, Wen; He, Shengtao

doi:10.3389/fmats.2021.792682

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…As the CaO content increased from 52% to 60%, the diffraction peaks of Ca(OH) 2 decreased while the diffraction peak intensity of C‐S‐H (CaO·SiO 2 ·nH 2 O) gel and Ettringite (AFt)‐Ca 6 Al 2 (SO 4 ) 3 (OH) 12 ·H 2 O was gradually improved, which indicated a series of hydration reactions. The main active components (C 3 S, C 2 S) were released by broken SiOSi and AlOAl in the sufficient alkaline system 30,31 . The increasing CaO content implied the accelerated arrival of the demanded balance in the reaction system, so that the vitreous dissolution in the steel slag, and the active components were released.…”

Section: Resultsmentioning

confidence: 98%

Effect of oxides composition on the mechanical properties of non‐sintered spherical filters from waste steel slag

Yan

Shen

Lin³

et al. 2022

Env Prog and Sustain Energy

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Non-sintered spherical filters (NSSFs) from the waste steel slag for bottom filtration process are regarded as promising materials for sustainable development with economical benefits due to saving natural resource pebbles. To further optimize the preparation process, the influence mechanism of the main oxides on characteristics are comprehensively examined in this work. CaO in the raw materials makes it easier to release active components from the resulting glass body structure, while the expansion stress of Ca(OH) 2 crystals precipitated under highly basic circumstances needs special consideration. SiO 2 can positively contribute to the properties due to its adequate participation in the hydration reaction and the micro-aggregate effect.Al 3+ tends to combine and form a stable tetrahedral structure, which is conducive to liquid viscosity and the hindrance of hydration reaction of the active substance.Under the 6% mass ratio of MgO, NSSFs exhibit relatively excellent in physical properties. Specifically, the stimulation and promotion effect of MgO on hydration reaction is superior to the negative effect of excessive product Mg(OH) 2 on expansion stress. Fe 2 O 3 particles convert the structure in NSSFs to a dense state by the filling effect and serving as nucleation sites to promote the formation of hydration products.

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Section: Resultsmentioning

confidence: 98%

Effect of oxides composition on the mechanical properties of non‐sintered spherical filters from waste steel slag

Yan

Shen

Lin³

et al. 2022

Env Prog and Sustain Energy

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“…This indicates that the BCSA improves the cracking resistance of OPC significantly. This is mainly attributed to the AFt and closely intertwined with the C-S-H gel to form a network structure [64]. This also leads to the improvement in mechanical and drying shrinkage properties as well as the reduction in porosity of the BCSA-OPC mortar.…”

Section: Sem Analysismentioning

confidence: 96%

Study on the Properties of Belite Calcium Sulfoaluminate Cement–Ordinary Portland Cement Composite Cementitious System

Xin,

Duan,

Zhu

et al. 2024

Buildings

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Due to low early strength and high shrinkage, ordinary Portland cement (OPC) has difficulty meeting the actual needs of modern construction projects, while belite calcium sulfoaluminate cement (BCSA–OPC) composite cement provides a new solution. The mechanical and the drying shrinkage properties of the BCSA–OPC mortar were determined, the hydration heat of the BCSA–OPC was studied, and the pore size distribution of the mortar was investigated. In addition, the hydration products of the BCSA–OPC were analyzed by X-ray diffraction (XRD) and simultaneous thermal analysis (TG-DSC), and the microscopic morphology of the BCSA–OPC mortar was observed by scanning electron microscopy (SEM). The results show that with the increase in BCSA dosage in the BCSA–OPC, compared with OPC, the flexural strengths of the mortar of 50% dosage of BCSA at the hydration age of 1 d, 3 d, 7 d, and 28 d are improved by 33.3%, 36.6%, 23.6%, and 26.8%, and the compressive strengths are improved by 50.8%, 35.7%, 13.4%, and 27.7%. The drying shrinkage and total porosity of the mortar at the hydration age of 28 d are reduced by 117.4% and 21.55%, respectively. It is attributed to the filling effect of a large amount of ettringite (AFt) and intertwined with the fibrous C-S-H gel to form a network. This study will provide a theoretical basis for the application of the BCSA–OPC engineering.

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“…It hydrates to generate C-S-H, Aft, or AFm, and potentially results in high cementitious properties. It was proposed that the addition of SS of less than 20% could slightly improve the compressive strength of SS-GBFS-FGDG mortar [ 19 ]. But a higher content of SS would have a negative impact on the compressive strength [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…It was proposed that the addition of SS of less than 20% could slightly improve the compressive strength of SS-GBFS-FGDG mortar [ 19 ]. But a higher content of SS would have a negative impact on the compressive strength [ 19 , 20 ]. The hydration degree of the composite cementitious materials was improved by GBFS with higher activity, thereby improving the compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Hydration Properties of Steel Slag-Based Composite Cementitious Materials with High Strength

Wang

et al. 2023

Materials

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Steel slag (SS) has been largely discharged but little utilized, causing an environmental problem in China. In this paper, SS-based composite cementitious materials with high strength were prepared by the high volume of SS (≥40%), granulated blast-furnace slag (GBFS), fly ash (FA), flue gas desulfurization gypsum (FGDG) and cement to promote the effective utilization of SS. The hydration and hardening properties were studied through setting time, compressive strength, length change, isothermal calorimetry (IC), X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscopy equipped with energy dispersive spectroscopy (SEM-EDS) tests. The results show that SS-based composite cementitious material exhibited a lower hydration heat release, an appropriate setting time, and volume stability. The SS cementitious material with 40% SS could obtain high strength of over 65 MPa at 28 days and 80 MPa at 90 days. The strength value of > 60 MPa is present in the binder, with 50% SS at 56 days. GBFS promotes hydration reactions and the formation of AFt and C-(A)-S-H gel, thus enhancing compressive strength. FA has a beneficial effect on later strength. The small and fine pore structures contribute to the development of strength. The main hydration products of SS composite cementitious materials are C-(A)-S-H gel, and ettringite (AFt), with less Ca(OH)2. The C-(A)-S-H gel with a lower Ca/Si ratio and a higher Al/Ca ratio in cementitious material, promotes mechanical properties.

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Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System

Cited by 10 publications

References 24 publications

Effect of oxides composition on the mechanical properties of non‐sintered spherical filters from waste steel slag

Effect of oxides composition on the mechanical properties of non‐sintered spherical filters from waste steel slag

Study on the Properties of Belite Calcium Sulfoaluminate Cement–Ordinary Portland Cement Composite Cementitious System

Preparation and Hydration Properties of Steel Slag-Based Composite Cementitious Materials with High Strength

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