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Ni, Chenxin (author), Yu, Zhuqing (author), Shen, Xiaodong (author)As one of the mineral admixtures, silica fume (SF) with high pozzolanic reactivity is generally used to improve the properties of concrete. Most commercial silica fume used in concrete project is dry densified silica fume (DSF). It consists of a good deal of agglomerates of sizes ranging from 10 μm to several millimeters. The size of the...conference paper 2021
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Le, N.L.B. (author), Stroeven, P. (author), Stroeven, M. (author), Sluys, L.J. (author)Details of a complete methodology for porosimetry of virtual concrete have been described in a series of publications. This paper shortly sketches the main characteristics, whereupon it is indicated how a pore network model is designed based on data extracted from the virtual cement paste. This involves smoothing the main trunks as the main pore...conference paper 2015
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- Koenders, E.A.B. (author), Pepe, M. (author), Caggiano, A. (author), Martinelli, E. (author), Toledo Filho, R.D. (author) conference paper 2013
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Tambara Jr, L.U.D. (author), Rocha, J.C. (author), Cheriaf, M. (author), Palomo, A. (author), Fernández-Jiménez, A. (author)The effect of including 5 % chloride salts (NaCl and CaCl2) on calcium sulfoaluminate cement hydration was studied. The rate of heat release, setting times and mechanical strength were determined in 2 d, 28 d and 90 d cement pastes. The hydration products formed at those ages were identified with XRD and SEM. Hydration reactions were hastened...conference paper 2021
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Antony, J. (author), Al-Bahar, S. (author), Jayasree, C. (author), Al-Arbeed, A. (author), Behbehani, Muntaha H. (author), Rasheed, Zakiah A. (author)Volcanic ash blended cement based concrete are known for its better performance in terms of strength and durability, especially in marine environments where hot and cold climatic conditions along with chloride and sulphate attacks are detrimental for the construction materials. Since the properties of volcanic ash will vary with region to region...conference paper 2021
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Pel, L. (author), Ji, Yanliang (author), Sun, Zhenping (author)With freshwater getting scares seawater, i.e., water containing NaCl, can become the only viable option for making concrete. Although a lot of research had been directed to understanding the role of water in cement hydration, not much is known about the interaction of the Na+ and Cl- with cement paste during drying. A problem is that available...conference paper 2021
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Wang, Liguo (author), Ju, Siyi (author), Wang, Lanxin (author), Jiang, Jinyang (author)Retarders have an important regulation effect on the hydration speed and setting time of cement. However, retarders are not conducive to the early strength development of concrete, so use early strength agents to improve their early performance. In this paper, the effects of different amounts of triethanolamine (TEA) and citric acid (CA) on the...conference paper 2021
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Caggiano, A. (author), Pepe, M. (author), Koenders, E.A.B. (author), Martinelli, E. (author), Etse, G.J. (author)Heat production induced by the hydration reaction and the resulting temperature evolution in the early phases of setting and hardening processes are critical phenomena, often leading to premature cracking of concrete members. However, the interest for simulating such phenomena is also related to the fundamental relationships between the nature...conference paper 2012
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Susanto, A. (author), Koleva, D.A. (author), Van Breugel, K. (author), Koenders, E.A.B. (author)Stray current is essentially an electrical current “leakage” from metal conductors and electrical installations. When it flows through cement-based systems, electrical energy is converted to thermal energy that causes increasing temperature due to Joule heating phenomena. The aim of this paper is to shed light on the influence of electrical...conference paper 2014
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Koenders, E.A.B. (author), Ukrainczyk, N. (author), Hansen, W. (author)Latest developments in Hymostruc enable the possibility to evaluate the pore connectivity of an evolving microstructure while also considering the contribution of the ITZ and air voids and to examine the influence on frost durability. The numerical model is used to visualize this phenomenon and to show the contribution of both the pores and the...conference paper 2012
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Seetharam, S.C. (author), Kottititum, B (author), Maes, N. (author), Srinophakun, T. (author)Accelerated carbonation curing of cellulose fiber-cement composites is known to improve their durability in the form of decreased porosity and increased mechanical properties. In addition, because carbonation results in a decrease in the alkalinity of cement paste, it makes cement less aggressive towards the cellulose fibers. The properties of...conference paper 2021
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Ji, Yanliang (author), Sun, Zhenping (author), Pel, Leo (author), Pang, Min (author)Bleeding can be described as water coming out from fresh cement paste, which not only affects the homogeneity at fresh stage but also decides the hardened state structure. Previous studies have focused on the determination or simulation of the bleeding extent of fresh cement paste and give objective conclusions. However, there are rare...conference paper 2021
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Goncharov, Antonina (author), Zhutovsky, Semion (author)It is common practice to use gypsum in cement production to control setting time. Traditionally it is believed that sulfate from gypsum combines with aluminates to form ettringite and monosulfate to prevent flash set. However, previous studies have confirmed that sulfates also affect the hydration and mechanical properties of pure alite paste....conference paper 2021
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- Huang, H. (author), Ye, G. (author) conference paper 2011
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Ukrainczyk, N. (author), Koenders, E.A.B. (author), Van Breugel, K. (author)The prospect of cement and concrete technologies depends on more in depth understanding of cement hydration reactions. Hydration reaction models simulate the development of the microstructures that can finally be used to estimate the cement based material properties that influence performance and service life. In this paper the multicomponent...conference paper 2012
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Elakneswaran, Yogarajah (author), Noguchi, Natsumi (author), Siventhirarajah, Krisnya (author), Chabayashi, Takashi (author), Kato, Hiroyoshi (author), Nawa, Toyoharu (author)Current understanding of the state of Fe during the hydration of cement is very limited and further studies are necessary to find out the possible incorporation of Fe in cement hydrates. Moreover, it is important to understand the hydration reaction and properties development of ferrite-rich cement. Our previous study [1] reported the hydration...conference paper 2021
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Le, L.B.N. (author), Stroeven, P. (author)Common cement blending materials for concrete like fly ashes, blast furnace slag, silica fume, metakaolin and rice husk ash have been investigated experimentally as to their impact on concrete’s mechanical, physical and sustainability capabilities. Such efforts offer but case-related information on involved materials and used procedures....conference paper 2014
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Stroeven, P. (author), Le, L.B.N. (author)Porosimetry of matured cementitious materials is of hiigh interest, because durability is governed by the capillary pore network structure. Experimental approaches are time-consuming, laborious and thus expensive. Fast developments in computer technology make it nowadays possible quite realistically producing cementitious materials in virtual...conference paper 2013
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Phung, Quoc Tri (author), Seetharam, Suresh .C. (author), Ferreira, Eduardo (author), Govaerts, Joan (author), Hendrix, Katrien (author), Valcke, Elie (author)This paper presents an extension of an existing phenomenological model for predicting the evolution of hydration heat of a cemented waste form. The cemented waste form is essentially a mixture of blended cement and homogeneous low- and intermediate-level liquid (simulant) radioactive waste (sludge). The motivation stems from the fact that the...conference paper 2021
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Susanto, A. (author), Koleva, D.A. (author), Van Breugel, K. (author)This paper reports on the influence of stray current flow on microstructural prop-erties, i.e. pore connectivity and permeability of mortar specimens, and link these to the observed alterations in mechanical properties and cement hydration. Mortar specimens were partly submerged in water and calcium hydroxide (Ca(OH)2) as an external environment...conference paper 2014