Blends of limestone powder and fly-ash enhance the response of self-compacting mortars

Rizwan, Syed; Bier, Thomas

doi:10.1016/j.conbuildmat.2011.07.030

Cited by 78 publications

(41 citation statements)

References 11 publications

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“…Approximately, spherical MP particle has provided ball bearing effects and has reduced internal friction in fresh concrete and these had increased the flow ability and compaction of the concrete. In summary, the flow properties of SCC depend heavily on the powder particle size, shape, surface morphology and internal porosity in addition to factors such as mixing regimen, sequence of admixture addition and water/SP content (Rizwan & Bier, 2012) and (Sua-iam & Natt Makul, 2012).…”

Section: Test On Hardened Concretementioning

confidence: 99%

Experimental study on steel fibre reinforced self-compacting concrete incorporating high volume of marble powder

Haddadou

Chaïd

Ghernouti

2014

European Journal of Environmental and Civil Engineering

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This paper presents the results of an experimental study which investigates the effect of the use of marble powder (MP), as partial cement substitution, on the fresh and hardened properties of fibre-reinforced self-compacting concrete (FRSCC) of nonuniform size (length) and aspect ratio of fibres used. For each length of steel fibre (25, 30 and 50 mm), three percentages (.5, .8 and 1%) were used to improve the performance of FRSCC. All mixtures of concrete specimens prepared with 30% of MP were evaluated. Slump flow time and diameter, sieve stability and L-Box were performed to assess the fresh properties of the (FRSCC). Compressive strength, splitting tensile strength, flexural strength and ultrasonic pulse velocity of the FRSCC and self-compacting concrete (SCC) were determined for the hardened properties. The results were compared with ordinary concrete (without steel fibre) containing 30% of MP (SCC). The results suggest that the incorporation of steel fibre in the SCC requires the use of high volume of superplasticiser to overcome the workability loss resulting from the elongated shape and large surface area of fibres. The sieve stability, Slump flow diameter, L-Box and Slump flow time for RSCC dropped to 1, 10, 12 and 65%, respectively. The workability loss is significant in the case of 1% and 50 mm length fibre which revealed the highest length and percentage. On the other hand, the use of steel fibre and MP has a significant effect on the mechanical performances. The increase in ultrasonic pulse velocity, compressive strength, splitting tensile strength and flexural strength reaches 2, 8, 16 and 29%, respectively. The addition of fibre enhanced the ductility significantly. The optimum volume fraction and aspect ratio of fibre for better performance in terms of strength was found to be .8% and 30 mm, respectively. The results indicated that high volume of MP can be used to produce FRSCC.

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Section: Test On Hardened Concretementioning

confidence: 99%

Experimental study on steel fibre reinforced self-compacting concrete incorporating high volume of marble powder

Haddadou

Chaïd

Ghernouti

2014

European Journal of Environmental and Civil Engineering

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“…while studying the fresh and hardened properties of self-compacting concrete concluded that use of fly ash greatly reduces the amount of superplasticizer required [5]. Using a blend of different fillers like fly ash, lime stone powder or other type of natural pozzolanic materials improves the overall performance of SCC like flow, strength, microstructure, relative water absorption and early volume stability [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fly Ash on Properties of Self-Compacting High Strength Lightweight Concrete

Iqbal¹,

Ali²,

Holschemacher³

et al. 2016

Period. Polytech. Civil Eng.

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IntroductionAs known, self-compacting concrete (SCC) is highly flowable, non-segregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation. It doesn't require any vibration for compaction and can flow through narrow spaces without segregation and excessive bleeding [1]. Therefore SCC is one of the greatest innovations of concrete technology. It was introduced in construction industry in early 1990s. Similar to the normal vibrated concrete (NVC), SCC mixtures consist of aggregate, cement, water, admixtures and some mineral additions. Unlike NVC, SCC has high quantity of fillers (eg. silica fume, fly ash, limestone powder etc.) and superplasticizer (high-range water reducing admixture) added to improve its flowing property.As SCC flows under its own weight without or very little use of vibration, it results in saving a lot of labor effort and bring economy to the concreting. Moreover, it can also flow through narrow and complex geometries where the use of vibrator is almost impossible.Use of SCC in construction industry is getting more and more popularity all over the world because of inherited advantages and studies on its hardened properties. SCC can be classified mainly into 3 different types [2]:• powder type;• viscosity type and • combination type The first type has a high amount of powder (all material <0.15 mm) ranging from 550-650 kg/m 3 , which provides the plastic viscosity and thus resistance to segregation whereas the yield point is determined by the addition of suitable superplasticizers. In the second type there is less powder content ranging from 350-450 kg/m 3 . In this type additional minerals or fillers are not used for segregation resistance. An admixture called viscosity modifying agent (VMA) is used to control the segregation, while yield point is controlled by the superplasticizer. The third type has a powder content of 450-550 kg/m 3 , but additionally rheology is controlled by the use of appropriate dosage of VMA and superplasticizer.

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“…Irassar et al (2011) noted that dilution effect of limestone when clinker is substituted with it causes a reduction of chemical shrinkage and heat released at early-age. Although Rizwan (2012) showed higher early-age shrinkage for mortar samples, other studies has found almost similar shrinkage between control samples and samples prepared with 15% limestone (Voglis et al 2005). Marzouki (2013) discussed that the limestone content in cement has no real influence on shrinkage over longer time periods where the dry shrinkages are essentially equivalent regardless of the limestone filler ratio in the cement.…”

Section: Literature Reviewmentioning

confidence: 92%

Effects of Intergrinding 12% Limestone with Cement on Properties of Cement and Mortar

Mohammadi

South

2016

ACT

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Blends of limestone powder and fly-ash enhance the response of self-compacting mortars

Cited by 78 publications

References 11 publications

Experimental study on steel fibre reinforced self-compacting concrete incorporating high volume of marble powder

Experimental study on steel fibre reinforced self-compacting concrete incorporating high volume of marble powder

Effect of Fly Ash on Properties of Self-Compacting High Strength Lightweight Concrete

Effects of Intergrinding 12% Limestone with Cement on Properties of Cement and Mortar

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