Effect of supplementary cementitious materials on autogenous shrinkage of ultra-high performance concrete

Ghafari, Ehsan; Ghahari, SeyedAli; Costa, Hugo; Júlio, Eduardo; Portugal, António; Durães, Luísa

doi:10.1016/j.conbuildmat.2016.09.123

Cited by 226 publications

(76 citation statements)

References 27 publications

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“…Xue et al [13] have found that shrinkage of the filled concrete can cause separation between steel tube and concrete, and Ghafari et al [14] have found that shrinkage can reduce the durability of the structures. Expansive cements, which can increase the volume of concrete due to chemical reactions, can reduce the shrinkage of concrete.…”

Section: Introductionmentioning

confidence: 99%

Study on Axial Compressive Capacity of FRP-Confined Concrete-Filled Steel Tubes and Its Comparisons with Other Composite Structural Systems

Deng

Zheng

Wang

et al. 2017

International Journal of Polymer Science

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Concrete-filled steel tubular (CFST) columns have been widely used for constructions in recent decades because of their high axial strength. In CFSTs, however, steel tubes are susceptible to degradation due to corrosion, which results in the decrease of axial strength of CFSTs. To further improve the axial strength of CFST columns, carbon fiber reinforced polymer (CFRP) sheets and basalt fiber reinforced polymer (BFRP) sheets are applied to warp the CFSTs. This paper presents an experimental study on the axial compressive capacity of CFRP-confined CFSTs and BFRP-confined CFSTs, which verified the analytical model with considering the effect of concrete self-stressing. CFSTs wrapped with FRP exhibited a higher ductile behavior. Wrapping with CFRP and BFRP improves the axial compressive capacity of CFSTs by 61.4% and 17.7%, respectively. Compared with the previous composite structural systems of concrete-filled FRP tubes (CFFTs) and double-skin tubular columns (DSTCs), FRP-confined CFSTs were convenient in reinforcing existing structures because of softness of the FRP sheets. Moreover, axial compressive capacity of CFSTs wrapped with CFRP sheets was higher than CFFTs and DSTCs, while the compressive strength of DSTCs was higher than the retrofitted CFSTs.

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Section: Introductionmentioning

confidence: 99%

Study on Axial Compressive Capacity of FRP-Confined Concrete-Filled Steel Tubes and Its Comparisons with Other Composite Structural Systems

Deng

Zheng

Wang

et al. 2017

International Journal of Polymer Science

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“…This is related to the pozzolanic effect of mineral admixtures. FA and GGBS react with hydration products Ca(OH) 2 to form the low density (LD) C‐S‐H and high density (HD) C‐S‐H, respectively . LD C‐S‐H would cover the surface of cement, hydrated products, and FA, reducing the efficiency of cement hydration reaction and pozzolanic effect.…”

Section: Resultsmentioning

confidence: 99%

Experimental study on the compressive strength and shrinkage of concrete containing fly ash and ground granulated blast‐furnace slag

Zhang

2019

Structural Concrete

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This paper presents an experimental investigation on the compressive strength and shrinkage (drying shrinkage and plastic shrinkage) property of concrete specimens with fly ash (FA) and ground granulated blast-furnace slag (GGBS), and moreover, the content level and curing age were considered in this experiment. The resultsshow that the addition of FA and GGBS has a significant effect on the compressive strength and shrinkage properties of concrete. It indicated that the compressive strength of specimens decreases gradually due to the reduction of cement hydration products, when the curing age is less than 14 days. Nevertheless, once the curing time exceeds 7 days, the compressive strength increases initially and then decreases. Similarly, the compressive strength of concrete with GGBS increases slightly at first and then decreases, when the content level exceeds the critical value. The variety rule of plastic shrinkage cracks with FA and GGBS is similar to that of compressive strength; however, the variety rule of drying shrinkage strain is contrary to the above experimental results. Furthermore, in the early stage of curing, the GGBS is the main factor on improving strength and drying shrinkage properties, though for the later stage, the FA becomes the main factor instead of GGBS. K E Y W O R D S compressive strength, drying shrinkage, fly ash, ground granulated blast-furnace slag, plastic shrinkage

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“…The chemical composition of raw materials was measured on molten samples, using fluorescence spectrometer PANalytical Axios Advanced; the specific surface area (SSA) was measured by gas adsorption (BET method) using Belsorp Max equipment; the real density was determined according to [17]. Density of nanosilica was calculated from density and mass concentration of suspension, 1.4 g/cm 3 and 50%, respectively, resulting in 2.33 g/cm 3 . Particle size distribution (PSD) of pure clinker, basaltic filler and silica-fume were determined using a laser granulometer Malvern 2200.…”

Section: Methodsmentioning

confidence: 99%

“…Nowadays, nanoparticles such as silicon dioxide [1][2][3], Portland cement [4], and carbon nanotubes (CNT) [5,6] have been tested in ultra-high strength concretes in order to improve their performance. The results published in [7] show an optimum nano-silica content, i.e.…”

Section: Introductionmentioning

confidence: 99%

Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

Mendes

Repette

Reis³

2017

Cerâmica

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INTRODUCTIONNowadays, nanoparticles such as silicon dioxide [1][2][3], Portland cement [4], and carbon nanotubes (CNT) [5,6] have been tested in ultra-high strength concretes in order to improve their performance. The results published in [7] show an optimum nano-silica content, i.e. the smallest quantity of nano-particles that leaded to the maximum compressive strength gain, for mixtures containing 0.5 wt% of silica nanoparticles. In [8], the maximum gain on compressive strength was observed for mixtures containing 2 wt% of nano-silica. The results published in [9] show a maximum gain on compressive strength for mixtures containing 2.82 wt% of nano-silica. In [10][11][12], the optimum content for mixtures containing 3 wt% of nano-silica was observed. In [13] the maximum compressive strength occurred for mixtures formulated with 4 wt% of nano-silica. Results published in [14] exhibit a tendency of linear increase on compressive strength, reaching the maximum strength for concretes formulated with 5 wt% of nanoparticles. In [15] the optimum nano-silica content was reached for mixtures containing 6% of nanoparticles. For large amounts of nanoCerâmica 63 (2017) [387][388][389][390][391][392][393][394] http://dx.doi.org/10.1590/0366-69132017633672037Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete (Efeitos da nanossílica no desempenho mecânico e microestrutura de concretos de ultra-alta resistência) UEL, Londrina, PR thiagomendes@utfpr.edu.br, wellington.repette@gmail.br, pjlondrina@yahoo.com.br AbstractThe use of nanoparticles in ultra-high strength concretes can result in a positive effect on mechanical performance of these cementitious materials. This study evaluated mixtures containing 10 and 20 wt% of silica fume, for which the optimum nano-silica content was determined, i.e. the quantity of nano-silica that resulted on the higher gain of strength. The physical characterization of raw materials was done in terms of particle size distribution, density and specific surface area. Chemical and mineralogical compositions of materials were obtained through fluorescence and X-ray diffraction. The mechanical performance was evaluated by compressive strength, flexural strength and dynamic elastic modulus measurements. The microstructural analysis of mixtures containing nano-silica was performed by X-ray diffraction, thermogravimetry, mercury intrusion porosimetry and scanning electron microscopy. Obtained results indicate an optimum content of nano-silica of 0.62 wt%, considering compressive and flexural strengths. This performance improvement was directly related to two important microstructural aspects: the packing effect and pozzolanic reaction of nano-silica. Keywords: ultra-high strength, nano-silica, mechanical performance, microstructure. silica, the maximum gain on mechanical properties for mixtures formulated with 10 wt% of silica nanoparticles was reported [16]. The flexural strength and elastic modulus present the same tendency for optimum nano-si...

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Effect of supplementary cementitious materials on autogenous shrinkage of ultra-high performance concrete

Cited by 226 publications

References 27 publications

Study on Axial Compressive Capacity of FRP-Confined Concrete-Filled Steel Tubes and Its Comparisons with Other Composite Structural Systems

Study on Axial Compressive Capacity of FRP-Confined Concrete-Filled Steel Tubes and Its Comparisons with Other Composite Structural Systems

Experimental study on the compressive strength and shrinkage of concrete containing fly ash and ground granulated blast‐furnace slag

Effects of nano-silica on mechanical performance and microstructure of ultra-high performance concrete

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