Chemical composition of calcium-silicate-hydrate gels: Competition between kinetics and thermodynamics

Du, Tianyu; Li, Hui; Zhou, Qi; Wang, Zhe; Sant, Gaurav; Ryan, Joseph V.; Bauchy, Mathieu

doi:10.1103/physrevmaterials.3.065603

Cited by 19 publications

(42 citation statements)

References 46 publications

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“…Buildings 2020, 10, 41 3 of 24 calcium ions (Ca 2+ ), which means that the silica in the reactive aggregate will simply dissolve in alkalihydroxide solution, and will not be available to form any alkali-silicate gel and expansion due to ASR can be reduced. In addition, concrete containing addition of glass powder (GP) as a binder shows very low permeability to chloride ions.…”

Section: Autoclaving Process During the Industrial Production Of Tradmentioning

confidence: 99%

“…In hydrated cements roughly 60%-80% of the volume of the solid formed comprises of the hydrated calcium silicate phases abbreviated as C-S-H. Many studies have been conducted to develop understanding of the structure and properties of C-S-H [39][40][41][42]. Interesting analysis were carried out by Constantinides and Ulm [43], who tried to describe the C-S-H phase in terms of low ((LD) C-S-H) and high density ((HD) C-S-H) products.…”

Section: Calcium Silicates Hydrates Formation Under Hydrothermal Condmentioning

confidence: 99%

“…Buildings 2020, 10, 41 11 of 24 reaction of lime, SiO2 source and water in the studied system. However, it should be noted that tobermorite is a hydrated silica with ordered structure.…”

Section: Xrd Of Traditional Sand-lime Laboratory Samplementioning

confidence: 99%

“…Buildings 2020, 10, 41 13 of 24 Traditional sand-lime products disclosed presence of calcium silicate mineral with tobermoritelike structure and the C-S-H phase. The creation and frequency of the occurrence of structures are connected with the quality of the components used and their chemical reactivity.…”

Section: Scanning Electron Microscopy (Sem) Of Traditional Sand-lime mentioning

confidence: 99%

“…Buildings 2020, 10, 41 16 of 24 Figure 20. SEM image of "Glass Bricks"-brick modified by 90% Glass Sand, high vacuum mode.…”

Section: Scanning Electron Microscopy (Sem) Of Traditional Sand-lime mentioning

confidence: 99%

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The Role of Glass Compounds in Autoclaved Bricks

et al. 2020

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This study describes the relationship between the physio-mechanical and chemical properties of sand-lime materials which have undergone hydrothermal treatment, and which were modified through the introduction of glass components (90% glass sand, GS). Process parameters such as temperature, pressure and saturation vapor pressure were found to have a significant impact on the series of chemical reactions as well as on the formation and transformation of solid hydrates. During the stirring process of sand-lime mass, the temperature of the reaction between lime and water in the presence of quartz sand (QS) was determined to be 83 °C. In the presence of glass sand, measured temperature was only 42 °C. Thermodynamic equilibrium-based modelling was applied to predict stable phase assemblages in the studied systems. It was found that compositional modification along with the application of the autoclaving process resulted in the formation of two crystalline phases: natrolite and gyrolite. Compressive strength and density were also assessed. The strength of fresh laboratory samples was found to be greater than their traditional analogues by 15 MPa. In addition to experimental characterization, sand-lime materials were also modeled using neural networks (backpropagation neural network, BPNN) which serve as a universal approximation method capable of modelling complex functions.

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Section: Autoclaving Process During the Industrial Production Of Tradmentioning

confidence: 99%

Section: Calcium Silicates Hydrates Formation Under Hydrothermal Condmentioning

confidence: 99%

“…Buildings 2020, 10, 41 11 of 24 reaction of lime, SiO2 source and water in the studied system. However, it should be noted that tobermorite is a hydrated silica with ordered structure.…”

Section: Xrd Of Traditional Sand-lime Laboratory Samplementioning

confidence: 99%

Section: Scanning Electron Microscopy (Sem) Of Traditional Sand-lime mentioning

confidence: 99%

“…Buildings 2020, 10, 41 16 of 24 Figure 20. SEM image of "Glass Bricks"-brick modified by 90% Glass Sand, high vacuum mode.…”

Section: Scanning Electron Microscopy (Sem) Of Traditional Sand-lime mentioning

confidence: 99%

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The Role of Glass Compounds in Autoclaved Bricks

et al. 2020

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Effects of high rebar casting temperature on porosity and Ca/Si ratio at steel–concrete interface of reinforced concrete

Chen

Lee

2023

Structural Concrete

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This study investigates effects of elevated rebar casting temperature on the interfacial porosity and Ca/Si ratio of the steel‐concrete interface by scanning electron microscopy (SEM). Experimental variables including rebar casting temperatures of 25°C, 40°C, 55°C, 70°C, and 85°C, water/cement ratios of 0.30, 0.45, and 0.60, and rebar diameters of 10 and 20 mm are considered. Large capillary pores of steel–concrete interface (SCI) were quantified by backscattered electron (BSE) imaging and Ca/Si ratio of hydration products of SCI were obtained by energy‐dispersive X‐ray (EDX) spectroscopy. The results were analyzed by using statistical methods (ANOVA analysis and Pearson correlation analysis). Results indicate that the average interfacial porosity and the average Ca/Si ratio can increase as a result of heated rebar effects. Heated rebar effects can be enhanced by increasing rebar diameter. Impact ranges of the heated rebar effects are also presented.

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