Chemical and physical effects of high-volume limestone powder on sodium silicate-activated slag cement (AASC)

Zhu, Xiaohong; Kang, Xiaojuan; Deng, Jiaxin; Yang, Kai; Jiang, Shouheng; Chen, Yang

doi:10.1016/j.conbuildmat.2021.123257

Cited by 45 publications

(10 citation statements)

References 34 publications

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“…As observed, the addition of µ-limestone could undoubtedly modify the mechanical responses of slag-based alkali-activated binders. As communicated in the literature, the mechanisms promoted by limestone that are favorable to the resistance development of slag-based paste are: (i) producing nucleation sites [ 69 , 70 , 71 ], (ii) increasing slag dissolution [ 72 , 73 , 74 ], (iii) improving pore refinement [ 69 , 71 , 72 , 75 , 76 ], (iv) reaching higher packing density [ 70 ], (v) enhancing reaction degree [ 73 , 75 ], and (vi) gel products’ intensification [ 73 ]. As was shown, the slag-based alkali-activated pastes exhibited compressive resistance higher than that of fly ash-based alkali-activated pastes provided by the C-A-S-H- or C-S-H-type gels [ 77 , 78 ].…”

Section: Resultsmentioning

confidence: 99%

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Microstructural and Mechanical Characteristics of Alkali-Activated Binders Composed of Milled Fly Ash and Granulated Blast Furnace Slag with µ-Limestone Addition

Vázquez-Rodríguez,

Elizondo,

Montes-González

et al. 2023

Materials

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Concrete is the most used construction material, needing large quantities of Portland cement. Unfortunately, Ordinary Portland Cement production is one of the main generators of CO2, which pollutes the atmosphere. Today, geopolymers are an emerging building material generated by the chemical activity of inorganic molecules without the Portland Cement addition. The most common alternative cementitious agents used in the cement industry are blast-furnace slag and fly ash. In the present work, the effect of 5 wt.% µ-limestone in mixtures of granulated blast-furnace slag and fly ash activated with sodium hydroxide (NaOH) at different concentrations was studied to evaluate the physical properties in the fresh and hardened states. The effect of µ-limestone was explored through XRD, SEM-EDS, atomic absorption, etc. The addition of µ-limestone increased the compressive strength reported values from 20 to 45 MPa at 28 days. It was found by atomic absorption that the CaCO3 of the μ-limestone dissolved in NaOH, precipitating Ca(OH)2 as the reaction product. SEM-EDS analysis showed a chemical interaction between C-A-S-H- and N-A-S-H-type gels with Ca(OH)2, forming (N, C)A-S-H- and C-(N)-A-S-H-type gels, improving mechanical performance and microstructural properties. The addition of μ-limestone appeared like a promising and cheap alternative for enhancing the properties of low-molarity alkaline cement since it helped exceed the 20 MPa strength recommended by current regulations for conventional cement.

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Section: Resultsmentioning

confidence: 99%

“…A small amount of µ-limestone might refine the pore structure [ 73 , 75 , 79 , 80 ]. Rashad et al [ 71 ] concluded in their research work that a microstructural densification effect when replacing 15% slag with limestone is observed, improving compactness, causing an induced filler effect, and enhancing packing density.…”

Section: Resultsmentioning

confidence: 99%

Microstructural and Mechanical Characteristics of Alkali-Activated Binders Composed of Milled Fly Ash and Granulated Blast Furnace Slag with µ-Limestone Addition

Vázquez-Rodríguez,

Elizondo,

Montes-González

et al. 2023

Materials

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“…Concrete is the most commonly used building material at present. But while providing convenience, the widespread use of cement has brought serious pollution problems [1,2] and energy consumption problems. [3,4] It is estimated that annual carbon emissions from cement production account for approximately 5%-7% of total global carbon emissions.…”

Section: Introductionmentioning

confidence: 99%

Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Zhao

Wang

et al. 2022

Structural Concrete

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In order to study the effect of different types of fibers on the bending properties of geopolymer concrete (GPC), a series of fiber‐reinforced geopolymer concrete (FRGPC) samples were prepared, and their flexural properties were evaluated by four point bending test and bending toughness evaluation index. Then, based on the fiber characteristic value (λ), a new bending strength prediction model and a three‐dimensional (3D) curved surface prediction model of the bending toughness of FRGPC are proposed and fitted. Finally, a new method for the selection of fibers in GPC is designed by calculating the derivative of the quadratic relationship between fiber reinforcement factor (S) and λ. The results show that all types of fibers have a certain effect on improving the bending strength of GPC samples, and the lifting rate is end‐hook steel fiber (SF), basalt fiber (BF), and short polyethylene polypropylene fiber (SPPF), from high to low. Mixing the above types of fibers with long polypropylene fibers (LPPF) will produce better performance. Among them, the hybrid fiber‐containing SF has the best performance. The bending performance prediction model deduced in this paper has a good correlation coefficient, which can be used to predict the bending performance of FRGPC. By making dS/dλ = 0 can calculate the optimal λ, and this λ can maximize the parameter S and guide the selection of optical fibers.

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“…In order to promote the sustainable development of the cement industry, effective measures to reduce the consumption of energy and non-renewable mineral resources have become an important topic in the field of cement research. Therefore, the feasibility of replacing part of the cement with various fillers, such as calcium-based stone powder, has been extensively studied [ 9 , 10 , 11 , 12 , 13 , 14 ]. In considering these calcium-based stone powders, eggshell powder (EP) is often overlooked.…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Eggshell Powder and Its Influence on Cement Hydration

Che

Ouyang

et al. 2022

Materials

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Using eggshell powder (EP) to replace partial cement in cement-based materials can abate pollution caused by eggshell discard and cement production. In this paper, the surface property of EP and its influence on cement hydration were studied. Quartz powder (QP) and limestone powder (LP) were used as references. First, the chemical composition of EP was characterized. Then, the surface charge properties of these materials were analyzed using zeta potential measurement. The interactions between EP surface and Ca2+ were discussed based on the zeta potential test. Afterward, a scanning electron microscope (SEM) was applied to observe the morphology of hydrates on the surfaces of these materials. The results indicated that, although the compositions of EP and LP are similar, the surface charge properties are significantly different. This is likely due to the existence of organic matter on the surface of EP and the difference in the atomic structure. As shown from the zeta potential test, EP exhibits similar interaction with Ca2+ as QP. The interactions between EP surface and Ca2+ are much weaker than that between LP and Ca2+. These weak interactions lead to the growth of C–S–H on the surface of EP particles less than that of LP particles. The chemical reactivity of EP can be improved by using heat treatment, electrical oven, etc. This study will provide theoretical support for the better use of EP in cement-based materials.

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Chemical and physical effects of high-volume limestone powder on sodium silicate-activated slag cement (AASC)

Cited by 45 publications

References 34 publications

Microstructural and Mechanical Characteristics of Alkali-Activated Binders Composed of Milled Fly Ash and Granulated Blast Furnace Slag with µ-Limestone Addition

Microstructural and Mechanical Characteristics of Alkali-Activated Binders Composed of Milled Fly Ash and Granulated Blast Furnace Slag with µ-Limestone Addition

Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Surface Properties of Eggshell Powder and Its Influence on Cement Hydration

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