Hydration Characteristics of Tricalcium Aluminate in the Presence of Nano-Silica

Zheng, Dapeng; Monasterio, Manuel; Feng, Weipeng; Tang, Waiching; Cui, Hongzhi; Dong, Zhijun

doi:10.3390/nano11010199

Cited by 19 publications

(8 citation statements)

References 44 publications

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“…Researchers have achieved new heights in the realm of nanotechnology with the discovery of nano-particles (NP) finer than 100 nm in size [28][29][30]. NP may be used to improve the mechanical characteristics of various materials, such as polymers [31][32][33] and cementitious materials [34][35][36][37], and are also useful in the medical, engineering, and food domains [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

et al. 2022

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Several review studies have been performed on nano-silica-modified concrete, but this study adopted a new method based on scientometric analysis for the keywords’ assessment in the current research area. A scientometric analysis can deal with vast bibliometric data using a software tool to evaluate the diverse features of the literature. Typical review studies are limited in their ability to comprehensively and accurately link divergent areas of the literature. Based on the analysis of keywords, this study highlighted and described the most significant segments in the research of nano-silica-modified concrete. The challenges associated with using nano-silica were identified, and future research is directed. Moreover, prediction models were developed using data from the literature for the strength estimation of nano-silica-modified concrete. It was noted that the application of nano-silica in cement-based composites is beneficial when used up to an optimal dosage of 2–3% due to high pozzolanic reactivity and a filler effect, whereas a higher dosage of nano-silica has a detrimental influence due to the increased porosity and microcracking caused by the agglomeration of nano-silica particles. The mechanical strength might enhance by 20–25% when NS is incorporated in the optimal amount. The prediction models developed for predicting the strength of nano-silica-modified concrete exhibited good agreement with experimental data due to lower error values. This type of analysis may be used to estimate the essential properties of a material, therefore saving time and money on experimental tests. It is recommended to investigate cost-effective methods for the dispersion of nano-silica in higher concentrations in cement mixes; further in-depth studies are required to develop more accurate prediction models to predict nano-silica-modified concrete properties.

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Section: Introductionmentioning

confidence: 99%

Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

et al. 2022

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“…As shown in Figure 3b, seen from the increasing main diffraction peaks of SiO 2 , Ca(OH) 2 , CSH and Ettringite, explanations were provided to tested physical properties. The presence of SiO 2 enriched the reaction system, and the Ca(OH) 2 released in an alkaline environment reacted with SiO 2 by the volcanic ash reaction, and thus activating the steel slag through the reaction process and the dissolution to promote the dissolution of more active substances 38 . The additional CSH acted as additional nucleation sites, promoting the formation and growth of reaction products from the dissolved units 39 .…”

Section: Resultsmentioning

confidence: 99%

“…The presence of SiO 2 enriched the reaction system, and the Ca(OH) 2 released in an alkaline environment reacted with SiO 2 by the volcanic ash reaction, and thus activating the steel slag through the reaction process and the dissolution to promote the dissolution of more active substances. 38 The additional C S H acted as additional nucleation sites, promoting the formation and growth of reaction products from the dissolved units. 39 While SiO Al 3+ entered into the alkaline pore solution to form hydrated sulphoaluminate with better conditions, which was conducive to stabilizing the growth activity of Anorthite and improving the phase conversion.…”

Section: Crystal Phase Analysismentioning

confidence: 99%

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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“…This effect correlates well with the results obtained from the measurement of plastic cracking. The changes observed in compressive strength from the first day up to 28 days later indicated that hydration experienced an acceleration caused by the addition of colloidal silica [61,62]. Consequently, a final setting time was approached, thereby reducing the period of exposure to the environment on fresh concrete.…”

Section: Strength Of Shotcrete Materialsmentioning

confidence: 99%

Prediction of Plastic Shrinkage Cracking of Supplementary Cementitious Material-Modified Shotcrete Using Rheological and Mechanical Indicators

Yun,

Panov,

Han

2023

Materials

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Plastic shrinkage cracking is a complex and multifaceted process that occurs in the period between placement and the final setting. During this period, the mixture is viscoplastic in nature and therefore possesses rheological properties. The investigation of the relationship between rheological behavior and its propensity to undergo cracking during the plastic phase presents an intriguing subject of study. However, many factors influence plastic cracking, and the corresponding interaction of its effects is complex in nature. This study aimed to evaluate the impact of rheological and physicomechanical properties on the occurrence of plastic cracking in high-performance shotcrete containing various supplementary cementitious materials. To achieve this, plastic cracking was evaluated employing the ASTM C 1579 standard and a smart crack viewer FCV-30, and the rheological parameters were controlled using an ICAR rheometer. In addition, a study was conducted to assess the strength development and fresh properties. Further, a relationship was established via statistical evaluation, and the best predicting models were selected. According to the study results, it can be concluded that high-yield stress and low plastic viscosity for colloidal silica mixtures are indicators of plastic cracking resistance owing to improved fresh microstructure and accelerated hydration reaction. However, earlier strength development and the presence of a water-reducing admixture allowed mixtures containing silica fume to achieve crack reduction. A higher indicator of yield stress is an indicator of the capillary pressure development of these mixtures. In addition, a series containing ultrafine fly ash (having high flow resistance and torque viscosity) exhibited a risk of early capillary pressure build-up and a decrease in strength characteristics, which could be stabilized with the addition of colloidal silica. Consequently, the mixture containing both silica fume and colloidal silica exhibited the best performance. Thus, the results indicated that rheological characteristics, compressive strength, and water-reducer content can be used to control the plastic shrinkage cracking of shotcrete.

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Hydration Characteristics of Tricalcium Aluminate in the Presence of Nano-Silica

Cited by 19 publications

References 44 publications

Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

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

Prediction of Plastic Shrinkage Cracking of Supplementary Cementitious Material-Modified Shotcrete Using Rheological and Mechanical Indicators

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