Mixture design methods for ultra-high-performance concrete - a review

Zhou, Min; Wu, Zemei; Ouyang, Xue; Xiang, Huimin; Shi, Caijun

doi:10.1016/j.cemconcomp.2021.104242

Cited by 81 publications

(25 citation statements)

References 147 publications

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“…There are many methods for designing the proportioning of machine-made sand concrete, and different proportioning methods have their own focus [ 5 , 6 ]. They are designed to meet specific performance requirements [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Orthogonal Experimental Study on Concrete Properties of Machine-Made Tuff Sand

et al. 2022

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Machine-made sand instead of natural sand has become an inevitable choice for the sustainable development of the concrete industry. Orthogonal experiment and grey correlation analysis were used to investigate the performance of machine-made tuff sand concrete. The optimal concrete mix ratio of machine-made sand was obtained by orthogonal test and its working performance was verified. Grey correlation analysis was applied to compare the factors affecting the mechanical properties of the machine-made sand concrete. The test results show that the sand rate has the greatest degree of influence on slump and slump expansion. The mineral admixture has the greatest effect on the 7-day compressive strength of the concrete. Additionally, the water–cement ratio has the greatest influence on the 28-day compressive strength. The mechanical and working properties of the machine-made sand concrete reach the optimum condition when the mineral admixture is 20%, the sand rate is 46%, the stone powder content is 10% and the water–cement ratio is 0.30. Comparing different fine aggregate concretes of similar quality, we conclude that the mechanical and working properties of tuff sand concrete and limestone sand concrete and river sand concrete are similar. The compressive strengths of the mechanism concrete show the greatest correlation with roughness and the least correlation with stone powder content. The stone powder content has almost no effect on the compressive strength of concrete when the stone powder content does not exceed a certain range. The results of the study point out the direction for the quality control of concrete with machine-made sand.

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Section: Introductionmentioning

confidence: 99%

Orthogonal Experimental Study on Concrete Properties of Machine-Made Tuff Sand

et al. 2022

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“…It was also found that the optimal content of the superplasticizer GleniumACE 430 is 0.45–0.56% of the cement mass, and that of the high-valence hardening accelerator AC is 0.07%. The optimum content of the hardening accelerator AC was determined, taking into account the Schulze–Hardy rule [ 22 ]. The use of a hardening accelerator provided a synergistic effect of using Glenium 430 and made it possible to additionally reduce the water content of the concrete mixture up to 20%.…”

Section: Resultsmentioning

confidence: 99%

“…The close parking method of the UHPC mixture design based on packing density refers to the proportion of solid volume to the cement and additive system’s total volume [ 22 , 23 , 24 ]. The authors propose a physical model of concrete microstructure and particle packing, consisting of spherical particles, to explain the results obtained.…”

Section: Discussionmentioning

confidence: 99%

“…The sufficient amount of empirical data on reactive powder concrete microstructure gives possibilities to suggest four commonly used mixture design methods for UHPC [ 22 ]. These methods include close packing methods based on dry and wet packing densities [ 23 , 24 , 25 ], method, based on the relationship between rheological properties of paste and raw materials [ 26 , 27 ], statistical analysis methods [ 28 ], and artificial neural network (ANN) models [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

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Reactive Powder Concrete Microstructure and Particle Packing

Velichko

Vatin

2022

Materials

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The subject of this study is the dispersed composition of multicomponent cement systems. This study aims to reduce interparticle voids, increasing the strength and concentration of the solid phase. The investigated concrete mixture contained two fine aggregate fractions, granite-gabbro crushed stone of 5–10 mm fraction, Portland cement of CEM I 42.5N class, finely dispersed granular blast furnace slag, microsilica, highly dispersed cement fraction, superplasticizer Glenium 430, and high-valence hardening accelerator. A laser analyzer determined the shape and size of dispersed particles of the components. The structure of the cement stone was studied by scanning microscopy, thermographic, and X-ray phase analysis methods. The strength of concrete with an optimized dispersed composition at the age of 2 days was 52, 63, and 74 MPa, while that at the age of 28 days was 128, 137, and 163 MPa. For this concrete, the consumption of multicomponent cement was 650, 700, and 750 kg/m3, respectively. The high efficiency of the application of bimodal clinker component and granulated blast-furnace slag is shown. It is established that the optimal content of nanoscale additives, including microsilica, should be insignificant and determined experimentally.

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“…As commonly known, the production of cement is said to account for about 7% of total carbon emissions [ 16 , 17 ]; hence, resource shortages and environmental requirements induce an urgent need for alternative methods to prepare UHPC with a low environmental footprint. Furthermore, silica fume is indispensable in the mixture design of UHPC, which accounts for 15–30% of the binder to achieve high compressive strength and durability [ 18 , 19 ]. Silica fume has a smaller particle size, which fills the voids in the matrix and accelerates the pozzolanic reaction to produce additional calcium silicate hydrates (C–S–H) [ 16 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Curing Regime on the Mechanical Strength, Hydration, and Microstructure of Ecological Ultrahigh-Performance Concrete (EUHPC)

Zuo

Zhang

et al. 2022

Materials

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This paper investigates the effect of curing regimes (standard and steam curing) on the mechanical strength, hydration, and microstructure of ecological ultrahigh-performance concrete (EUHPC). The flowability, compressive strength, flexural strength, hydration, porosity, pore size distribution, and microstructure of UHPC with different contents of supplementary materials (silica fume, fly ash, and ground granulated blast furnace slag) were assessed. The test results showed that the compressive strength of EUHPC under steam curing was increased considerably compared to that under standard curing, while the flexural strength was mildly decreased. The steam curing could decrease the porosity of EUHPC, which ranged between 7% and 9% for standard curing, and between 3.5% and 5% for steam curing. The aperture of EUHPC was below 20 nm, mainly located in the range of 10 nm to 20 nm under standard curing, while it was less than 10 nm for steam curing. C–S–H gel was produced under steam curing, while unhydrated fly ash, mineral powder, and Ca(OH)2 crystal were observed in the amorphous C–S–H gel. The microstructure of EUHPC under steam curing was denser than that under standard curing, and the interfacial transition zones under both curing regimes were compact.

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Mixture design methods for ultra-high-performance concrete - a review

Cited by 81 publications

References 147 publications

Orthogonal Experimental Study on Concrete Properties of Machine-Made Tuff Sand

Orthogonal Experimental Study on Concrete Properties of Machine-Made Tuff Sand

Reactive Powder Concrete Microstructure and Particle Packing

Effect of Curing Regime on the Mechanical Strength, Hydration, and Microstructure of Ecological Ultrahigh-Performance Concrete (EUHPC)

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