Journal ArticleDOI
Investigation of strength and hydration characteristics in nano-silica incorporated cement paste
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A hydration model for Portland cement pastes modified with nano-silica in partial substitution is formulated based on the nucleation growth process from microstructural investigations over time as discussed by the authors.Abstract:
A hydration model for Portland cement pastes modified with nano-silica in partial substitution is formulated based on the nucleation growth process from microstructural investigations over time. The model is calibrated against thermogravimetry, X-ray diffraction and calorimetry data for four different substitution rates from 0 to 12 wt% and is validated by backscattered electron microscopy. Finite element based compressive strength predictions using representative volume element analysis of the nano modified cement pastes agreed with the experimental values. The model predictions indicate that a rate of 8 wt% is the optimum replacement level of cement by nano-silica leading to a high density matrix promoting a maximum mechanical strength.read more
Citations
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Reactivity of supplementary cementitious materials (SCMs) in cement blends
Jørgen Skibsted,Ruben Snellings +1 more
TL;DR: In this paper, the authors review recent progress in the description and understanding of the reactivity of SCMs and their impact on Portland clinker hydration, as well as recent work studying the impact of common SCMs on hydration and microstructure of blended cements.
Journal ArticleDOI
A modified firefly algorithm-artificial neural network expert system for predicting compressive and tensile strength of high-performance concrete
TL;DR: The result indicates that the MFA-ANN hybrid system can obtain a better prediction of the high-performance concrete properties and can provide an efficient and accurate tool to predict and design HPC.
Journal ArticleDOI
Effects of nano-SiO2 on early strength and microstructure of steam-cured high volume fly ash cement system
Min Liu,Hongbo Tan,Xingyang He +2 more
TL;DR: In this paper, nano-SiO2 (NS) was introduced in a steam-cured cementitious system to induce the early hydration, with intention to promote the early strength.
Journal ArticleDOI
The roles of biochar as green admixture for sediment-based construction products
Lei Wang,Liang Chen,Daniel C.W. Tsang,Harn Wei Kua,Jian Yang,Yong Sik Ok,Shiming Ding,Deyi Hou,Chi Sun Poon +8 more
TL;DR: In this article, the authors explored the efficacy of wood waste biochar as a green admixture and assessed the influence of different physico-chemical properties of dredged sediments on the mechanical performance of cement-based sediment products.
Journal ArticleDOI
Properties improvement of fly ash cenosphere modified cement pastes using nano silica
TL;DR: In this article, the effect of nano silica on the properties of cement pastes incorporated with of fly ash cenospheres (FACs) has been investigated, and it was found that NS was beneficial in improving the mechanical strength.
References
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Book
Properties of concrete
TL;DR: In this article, the authors present the following properties of concrete: Elasticity, Shrinkage and Creep, Durabilty of Concrete, Freezing and Thawing, and Chlorides.
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Elastic properties of reinforced solids: some theoretical principles
TL;DR: In this paper, an elementary account of several theoretical methods of attack is given, among them the derivation of inequalities between various moduli, and the approach is completely general and exact.
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Supplementary cementitious materials
TL;DR: The use of silica-rich SCMs influences the amount and kind of hydrates formed and thus the volume, the porosity and finally the durability of these materials.
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Nanotechnology in concrete – A review
TL;DR: In this paper, the state of the field of nanotechnology in concrete is reviewed and the impact of recent advances in instrumentation and computational materials science and their use in concrete research is discussed.
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Microstructure of cement mortar with nano-particles
TL;DR: In this paper, the mechanical properties of nano-Fe2O3 and nano-SiO2 cement mortars were experimentally studied and the experimental results showed that the compressive and flexural strengths measured at the 7th day and 28th day of the cement mortar mixed with the nano-particles were higher than that of a plain cement mortar.