Kinetics of formwork pressure drop of self-consolidating concrete containing various types and contents of binder

Assaad, Joseph J.; Khayat, Kamal H.

doi:10.1016/j.cemconres.2004.12.005

Cited by 41 publications

(17 citation statements)

References 4 publications

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“…This leads to higher degree of cohesiveness, progressive tendency to formation of a gel structure and inter-particle links and developing internal networks. Therefore, greater initial shear stress values are expected in rich mixtures [5,51]. As shown in Fig.…”

Section: Breakdown Area Valuesmentioning

confidence: 90%

“…Therefore, for a given application the mixture parameters of SCC should be adjusted to achieve a given profile of thixotropic properties that can take into account the various requirements. Many parameters such as w/b ratio [36], binder type and content [2,37], aggregate characteristics and content [38] can affect the rheological properties, thixotropic and structural breakdown behavior of SCC. Besides the type and dosage of high-range water-reducing admixture (HRWR) [36], type and concentration of viscosity-modifying admixture (VMA) [39] as well as use of set-modifying admixtures [30] are important parameters in this respect.…”

Section: Introductionmentioning

confidence: 99%

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Thixotropy and structural breakdown properties of self consolidating concrete containing various supplementary cementitious materials

Ahari

Erdem

Ramyar

2015

Cement and Concrete Composites

103

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Supplementary cementitious materials Thixotropy Breakdown Drop in apparent viscosity Yield value at rest a b s t r a c tIn this study, thixotropy and structural breakdown of 57 self-consolidating concrete (SCC) mixtures containing various supplementary cementitious materials (SCM) were investigated by different approaches. The effects of SCM type and content on high range water reducer demand and plastic viscosity were also studied. For these purposes, various amounts of silica fume (SF), metakaolin (MK), Class F fly ash (FAF), Class C fly ash (FAC) and granulated blast-furnace slag (BFS) were utilized in binary, ternary, and quaternary cementitious blends in three water/binder (w/b) ratios. Results showed that except BFS, use of SCM in SCC mixtures increased thixotropy values in comparison with the mixtures containing only portland cement (PC). Good correlations were established between structural breakdown area and drop in apparent viscosity values for all w/b ratios. The different methods used to evaluate the thixotropy and structural breakdown got more consistent with each other as w/b decreased.

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Section: Breakdown Area Valuesmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Thixotropy and structural breakdown properties of self consolidating concrete containing various supplementary cementitious materials

Ahari

Erdem

Ramyar

2015

Cement and Concrete Composites

103

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“…On the other hand, for constant water contents, mixtures with higher binder contents result in higher degree of cohesiveness, progressive tendency to formation of a gel structure and interparticle links and developing internal networks. Therefore, greater amount of plastic viscosity is expected in rich mixtures [10,37]. As shown in Fig.…”

Section: Plastic Viscositymentioning

confidence: 99%

“…The V-funnel times obtained from 57 SCC mixtures with three w/b ratios are presented in Table 5. These values were ranged from The increase in the concentration of aggregate increases the degree of internal friction and reduces the mobility of the concrete [37]. Also increasing aggregate content can lead to greater risk of collision among coarse aggregate particles at the tapered outlet of the V-funnel [10].…”

Section: V-funnel Timementioning

confidence: 99%

Effect of various supplementary cementitious materials on rheological properties of self-consolidating concrete

Ahari

Erdem

Ramyar

2015

Construction and Building Materials

121

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h i g h l i g h t sThe effect of binder type and content on the benefits of SCM in SCC was investigated. Metakaolin was able to increase the plastic viscosity of SCC by 90%. Silica fume and blast furnace slag reduced the plastic viscosity of SCC. Yield stress of the mixtures with SCM was higher than that of the control mixtures. a r t i c l e i n f o b s t r a c tIn design of self-consolidating concrete (SCC) for a given application, the mixture's rheological parameters should be adjusted to achieve a given profile of yield stress and plastic viscosity. Supplementary cementitious materials (SCM) can be useful for this adjustment in addition to their other advantages. In this study, the rheological properties of 57 SCC mixtures with various SCM were investigated for a constant slump flow value. For this aim, various amounts of silica fume (SF), metakaolin (MK), Class F fly ash (FAF), Class C fly ash (FAC) and granulated blast-furnace slag (BFS) were utilized in binary, ternary, and quaternary cementitious blends in three water/binder ratios. Results showed that SF and BFS decreased plastic viscosity and V-funnel time values in comparison with mixtures containing only Portland cement (PC). However the opposite tendency was observed when MK, FAC and FAF were incorporated with PC. Substitution of PC with SF, MK and FAC increased high range water reducer (HRWR) demand in the SCC mixtures having constant slump flow. Use of SCM in SCC mixtures increased yield stress values. Good correlations were established between plastic viscosity and V-funnel flow time values for all w/b ratios.

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“…In fact, directions for designing formworks relative to ordinary concretes do not apply to SCC, for which the design recommendation to design formwork for full hydrostatic pressure (fluid density of 2400kg/m 3 ) drastically increases the cost of constructions made of SCC [4]. There are indications, however, confirming the possibility of saving considerable amounts of money when constructing formwork for SCC, because data of pressures measured both in the laboratory (Assaad and Khayat [5,6]) and in the field (Skarendahl [7], Brameshuber and Uebachs [8], Billberg [9]) often resulted to be lower than hydrostatic. When measured SCC formwork pressure were found to be in agreement with the hydrostatic hypothesis, this behaviour from the concrete was mainly attributed to the effect of relatively high casting rates that, however, not always were higher than in other case with SCC behaving differently.…”

Section: Introductionmentioning

confidence: 99%

In-situ measurement of formwork pressures generated by Self-Compacting Concrete

Giammatteo¹,

Gregori²,

Totani³

2007

WIT Transactions on Modelling and Simulation, Vol 46

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Self-Compacting Concretes (SCC) are a special category of concretes and directions for designing formwork relative to ordinary concretes do not apply to them. In this paper an experimental study on formwork pressure exerted by SCC is reported. The behaviour of the SCC was investigated in instrumented formworks provided for two different types of pressure sensors: common diaphragm pressure transducers and dilatometer cells. In situ measurements of formwork pressure were carried out on walls and concrete columns 6m and 9m high, 0.30m thick and 2.50 or 0.50m wide respectively. Successfully, both types of sensor were in agreement describing the continuous time variation of the pressures.

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Kinetics of formwork pressure drop of self-consolidating concrete containing various types and contents of binder

Cited by 41 publications

References 4 publications

Thixotropy and structural breakdown properties of self consolidating concrete containing various supplementary cementitious materials

Thixotropy and structural breakdown properties of self consolidating concrete containing various supplementary cementitious materials

Effect of various supplementary cementitious materials on rheological properties of self-consolidating concrete

In-situ measurement of formwork pressures generated by Self-Compacting Concrete

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