Use of multiphase voxels to simulate the effects of nano-silica on cement hydration

Nguyen, Van Thong; Lee, Seon Yeol; Chung, Sang-Yeop; Moon, Jaekyun; KIM, Dong Joo

doi:10.1016/j.cscm.2023.e01909

Cited by 1 publication

(3 citation statements)

References 90 publications

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“…Meanwhile, the ranking of minerals' contribution to the early strength of cement-based materials is SF > S > FA. The reason for the above phenomenon is that SF has better activity and can generate denser C-S-H gel [13,14] more quickly, which is helpful for early mechanical properties. However, FA with a low pozzolanic effect hardly contributes to the mechanical properties of cement-based materials within 7 days of hydration [9].…”

Section: Evolution Of Mechanical Propertymentioning

confidence: 99%

“…Comparing JJ-2, JJ-4, and JJ-6 or JJ-3, JJ-5, and JJ-7, the addition of S and SF also improves the content of gel water, and the order of their influence is SF > S > FA. The reason for this phenomenon is that the activity of SF and S is better than that of FA, and the extremely fine-grained SF (the average particle size is smaller than 0.1 mm) has a better effect on refining pores [13,14].…”

Section: Evolution Of Evaporable Watermentioning

confidence: 99%

“…When SF is added to cement, it can react earlier with CH formed by the cement hydration to generate C-S-H gel, i.e., giving better play to the pozzolanic effect [13,14]. Meanwhile, microparticles of SF (with a particle size of about 100 nm) can effectively fill the large pores in the interfacial transition zone between cement paste and aggregate [14]. It improves the structural density of the SF-C system and causes its early compressive strength.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Evolution Of Mechanical Propertymentioning

confidence: 99%

Section: Evolution Of Evaporable Watermentioning

confidence: 99%