Development of an eco-friendly Ultra-High Performance Concrete (UHPC) with efficient cement and mineral admixtures uses

Yu, Rui; Spiesz, PR Przemek; Brouwers, Hjh Jos

doi:10.1016/j.cemconcomp.2014.09.024

Cited by 517 publications

(194 citation statements)

References 71 publications

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“…Flow tests were conducted immediately after mixing, and the cone lifted straight vertically to allow free flow of the mixture without any jolting. Details of the mini slump measurements have been reported in previous studies [33,34] . Each mix was tested twice.…”

Section: Flowability Testmentioning

confidence: 99%

“…The time to reach the main peaks was reduced as the GGBS content was increased, although the time between the lower point and the first inflection point in the main maximum peak was increased from 58 to 145 minutes (by increasing GGBS 14 from 20 % to 50 % of the total binder). Yu et al [34] examined the effect of mixing GGBS and FA with Portland cement, and showed that GGBS can react quickly with Ca(OH) 2 and generate a C-S-H gel, while the generation of this gel is delayed by the reaction of FA with portlandite. Therefore, increasing the dosage of slag strongly effects (accelerates) the hydration process of FA geopolymer composite, and the time to reach thermal peaks is subsequently reduced.…”

Section: Thermal Analysis (Dsc)mentioning

confidence: 99%

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Development of geopolymer mortar under ambient temperature for in situ applications

Al-Majidi

Λαμπρόπουλος

Cundy

et al. 2016

Construction and Building Materials

305

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Geopolymer concrete technology involves production of more environmentally friendly waste material-based concrete which could be a viable solution for conventional concrete replacement. Typical fly ash-based geopolymer concrete however requires high temperature curing treatment in order to develop sufficient early strength properties, which is considered a severe limitation for cast-in-place concrete applications. Most previous studies on geopolymer concrete have focused on the properties of concretes pre-hardened by heat curing and/ or by aggressive chemical treatment (e.g. alkali activation using concentrated sodium hydroxide (NaOH)). The current study presents an extensive experimental investigation on the mechanical and microstructural properties of geopolymer concrete mixes prepared with a combination of fly ash and slag cured under ambient temperature. 'User friendly' geopolymer mixes were produced using fly ash (FA) and Ground Granulated Blast furnace Slag (GGBS) mixed together with potassium silicate with molar ratio equal to 1.2 (as the activator) and water. The results indicated that heat curing treatment can be avoided by partial replacement of fly ash with slag. The compressive strength of the examined mixes was found to be in the range of 40-50MPa for 40 % and 50 % GGBS replacement mixtures respectively. Moreover, the flexural and direct tensile strengths of geopolymer mixes are considerably improved as the GGBS content is increased.Based on FTIR and SEM/EDS analysis, the inclusion of a higher content of GGBS resulted in a denser structure by formation of more hydration products.Keywords: Fly ash, slag, ambient temperature, user friendly geopolymer mortar *Manuscript Click here to view linked References 2 IntroductionThere are many environmental issues associated with the production of Ordinary Portland cement (OPC), such as consumption of 5% of natural resources, and generation of 5-7 % of total global anthropogenic carbon dioxide emissions [1][2][3][4]. This has led to an urgent need for the development of alternative materials that may provide technically viable alternative solutions to conventional cementitious concrete, with more favourable environmental credentials. Geopolymer concrete manufacture is one of the most promising techniques which has been developed in the last few years. Utilization of geopolymer materials can reduce 80% of greenhouse gas emissions associated with material production, and overcome issues related to cement production and unregulated disposal of industrial materials by recycling these materials in geopolymer manufacture [5][6][7].Geopolymers are inorganic by-product materials, rich in silicon (Si) and aluminium Five different mixtures of geopolymer mortar proportions were examined with various ratios of GGBS to total binder (10%, 20%, 30%, 40% and 50 %, Table 2). Based on preliminary experimental studies undertaken during the current project, the optimum mix design (in terms of mechanical strength and workability) was achieved using water, alkaline activator...

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Section: Flowability Testmentioning

confidence: 99%

Section: Thermal Analysis (Dsc)mentioning

confidence: 99%

Development of geopolymer mortar under ambient temperature for in situ applications

Al-Majidi

Λαμπρόπουλος

Cundy

et al. 2016

Construction and Building Materials

305

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“…The pozzolanic reaction of mineral admixtures partially consumes calcium hydroxide, and produces the secondary C-S-H gel to densify the microstructure of concrete [7][8][9][10][11][12]. Therefore, the presence of mineral admixtures is known to affect the sulfate resistance of concrete.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Microanalytical Study on Concrete Exposed to the Sulfate Environment

Fang

Yin

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Steel fiber reinforced high strength portland cement mortar has been used to develop ultrahigh performance concrete in the previous literature (1)(2)(3)(4)(5)(6)(7). High strength portland cement mortar with good workability, high compressive and tensile strength, and durability can be produced using low water-cementitious materials ratio, high quality fine aggregate/sand, steel reinforcing fiber and high range water reducing admixtures (HRWRA).…”

Section: Introductionmentioning

confidence: 99%

Predicting the drying shrinkage behavior of high strength portland cement mortar under the combined influence of fine aggregate and steel micro fiber

2017

Mater. construcc.

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ABSTRACT:The workability, 28-day compressive strength and free drying shrinkage of a very high strength (121-142 MPa) steel micro fiber reinforced portland cement mortar were studied under a combined influence of fine aggregate content and fiber content. The test results showed that an increase in the fine aggregate content resulted in decreases in the workability, 28-day compressive strength and drying shrinkage of mortar at a fixed fiber content. An increase in the fiber content resulted in decreases in the workability and drying shrinkage of mortar, but an increase in the 28-day compressive strength of mortar at a fixed fine aggregate content. The modified Gardner model most accurately predicted the drying shrinkage development of the high strength mortars, followed by the Ross model and the ACI 209R-92 model. The Gardner model gave the least accurate prediction for it was developed based on a database of normal strength concrete.

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Development of an eco-friendly Ultra-High Performance Concrete (UHPC) with efficient cement and mineral admixtures uses

Cited by 517 publications

References 71 publications

Development of geopolymer mortar under ambient temperature for in situ applications

Development of geopolymer mortar under ambient temperature for in situ applications

Microstructural and Microanalytical Study on Concrete Exposed to the Sulfate Environment

Predicting the drying shrinkage behavior of high strength portland cement mortar under the combined influence of fine aggregate and steel micro fiber

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