Simulation of silica fume blended cement hydration

Ji, Yajun; Cahyadi, Jong Herman

doi:10.1007/bf02479636

Cited by 24 publications

(17 citation statements)

References 12 publications

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“…In this study, it is assumed that the pozzolanic reaction of SF takes place according to Equation (11). This assumption has been adopted successfully in many simulations and calculations involving SF (Bentz, 2000;Bentz et al, 2000;Swaddiwudhipong et al, 2003;Yajun and Cahyadi, 2004).…”

Section: Reaction Of Sf In Binary Pastementioning

confidence: 99%

Hydration of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method to Estimate Degrees of Hydration and Pozzolanic Reaction

et al. 2019

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Section: Reaction Of Sf In Binary Pastementioning

confidence: 99%

Hydration of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method to Estimate Degrees of Hydration and Pozzolanic Reaction

et al. 2019

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“…

where

is the hydration of silica fume,

is the SF affinity which is given in the equation (64) ,

is the activation energy of SF,

is the material constant, which is given in the equation (65) .

where

and

are the experimentally computed material constants are given by Yajun [44] .

is the ultimate degree of SF reaction, this is defined in equation (66) given by Yajun [44] and Luzio [43] .…”

Section: Theorymentioning

confidence: 99%

“…

where

and

are the experimentally computed material constants are given by Yajun [44] .

is the ultimate degree of SF reaction, this is defined in equation (66) given by Yajun [44] and Luzio [43] .

and

According to Yajun [44] , all the calcium hydroxide (CH) produced during the cement hydration can consumed by the pozzolanic reaction when sufficient amount of SF available in the mixture.…”

Section: Theorymentioning

confidence: 99%

Experimental and numerical modeling of creep in different types of concrete

Reddy

Ramaswamy

2018

Heliyon

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Creep in concrete, play a critical role in estimating losses in prestressed concrete structures, such as bridge girders, nuclear containment vessels, etc. The present study aims at investigating the creep under various environmental conditions in different types of concrete made with different ingredients using an experimental and numerical approach. Seven different concrete mixes have been made for this purpose and among the seven mixes, three mixes are self compacted concrete mixes (35 MPa, 55 MPa and 70 MPa), a high volume fly ash concrete mix (45 MPa), two mixes of normally vibrated ordinary Portland cement (OPC) concrete mixes (35 MPa and 45 MPa) and a heavy density concrete (25 MPa). Studies have been carried out at temperature of 25 °C and two relative humidity (RH) conditions (RH of 60% and 70%). An analytical model has been developed to simulate the drying phenomena in concrete based on a poromechanics approach. The hydration effects in blended cements (containing mineral admixture) is considered while developing the model. The proposed model is capable of predicting the degree of hydration, temperature and relative humidity (RH) over the continuum that required for estimating the creep strain. Micro prestress solidification (MPS) is used to estimate the creep strain. It is found that the proposed model is able to predict the drying phenomena and creep strain in various concretes, and which is in good agreement with the corresponding experimental results. It is found that heavy density concrete shows a higher creep strain than the other concretes. This may be due to the lower porosity of hematite aggregate. Further adding fly ash as a mineral admixture to concrete mix reduces the creep. Creep in a reinforced concrete (RCC) beam tested under sustained loading and reported in the literature is simulated using the present model and it is seen that the model predictions are in good agreement with the test data.

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“…Property evolution of nanoSiO 2 -added cementitious materials can be reflected by the effects of nanoSiO 2 on cement hydration, gel property modification, and pore structure refinement [3,[13][14][15][16]. Results have shown that the strength enhancing effect of nanoSiO 2 in the early age is related to its hydration acceleration effect, but its effects in the later age have rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Modification effects of colloidal nanoSiO2 on cement hydration and its gel property

Hou

Kawashima

Kong

et al. 2013

Composites Part B: Engineering

398

142

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a b s t r a c tTo understand the effects of colloidal nanoSiO 2 (CNS) on cement hydration and gel properties in the early and later age, hydration heat, calcium morphology, hydroxide content, non-evaporable water (NEW) content and nanoscale mechanical properties were measured. Some comparison studies were conducted on silica fume (SF) paste, as well. Results revealed that the accelerating effect of CNS on hydration in the early age is achieved by the acceleration of cement dissolution and hydrate nucleation on reacted nano-SiO 2 particles. Although cement hydration can be greatly accelerated by CNS in the early age, its later age hydration is hindered. The NEW content of CNS-added paste experiences a higher rate of increase initially, but gradually becomes smaller than that of the control paste due to changes in the gel structure, making NEW content an unsuitable method for monitoring the hydration of CNS-added paste. However, nanoindentation results revealed that CNS modifies the gel structure to increase the high-stiffness C-S-H gel content.

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Simulation of silica fume blended cement hydration

Cited by 24 publications

References 12 publications

Hydration of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method to Estimate Degrees of Hydration and Pozzolanic Reaction

Hydration of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method to Estimate Degrees of Hydration and Pozzolanic Reaction

Experimental and numerical modeling of creep in different types of concrete

Modification effects of colloidal nanoSiO2 on cement hydration and its gel property

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