High performance concrete—An overview

Neville, Adam; Aı̈tcin, Pierre-Claude

doi:10.1007/bf02486473

Cited by 221 publications

(82 citation statements)

References 3 publications

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“…High performance concretes (HPCs) are typically designed with superior performance characteristics relative to normal concretes (NCs) [1][2][3]. Resulting enhanced durability of concrete structures containing HPCs is a key driving force behind their application [2,3].…”

Section: Introductionmentioning

confidence: 99%

Development of a new in situ test method to measure the air permeability of high performance concretes

Yang

Basheer

Bai

et al. 2014

NDT & E International

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Although several in situ techniques, including the Autoclam Permeability System, are available to examine normal concretes (NCs) for this purpose, none are sufficiently sensitive to quantify and distinguish relative high performance concrete (HPC) performance. Therefore, to assess the HPC performance characteristics using the Autoclam air permeability test methodology, two key modifications were investigated and a new test protocol developed. The first modification considered a reduced volume of compressed air applied to the test area (named LV test), and the second an increased test area (named A-75). The reliability of the proposed modifications was investigated by comparing against a laboratory-based gas permeability test method (RILEM air permeability test).Surface resistivity and relative humidity were assessed to evaluate the influence of moisture conditions on in situ air permeability test results. A strong correlation between LV test and RILEM air permeability test results was found when the free moisture near concrete surface regions (up to 20 mm) was removed. It was concluded that the LV test exhibits strong potential to become an established method for assessing in situ HPC permeability. Key wordsIn situ air permeability test, high performance concrete, relative humidity, surface resistivity, RILEM gas permeability test, Autoclam air permeability test Page-2 IntroductionHigh performance concretes (HPCs) are typically designed with superior performance characteristics relative to normal concretes (NCs) [1][2][3]. Resulting enhanced durability of concrete structures containing HPCs is a key driving force behind their application [2,3]. This is particularly relevantgiven the large sums of money spent annually on repairing and maintaining structures worldwide [4,5]. Various grades of HPCs can be designed, manufactured and tested in laboratory conditions to satisfy design specifications for different service conditions [2,6,7]. However, it is not safe to assume at all times that pre-specified durability levels are achieved on site, as ultimate engineering concrete properties are not solely related to materials, mix proportions and service environments, but also factors which are difficult to control on site, such as manufacturing and delivery processes, as well as construction practices employed from initial placement to final curing [4,8,9]. As a result, a correlation between performance assumptions and in situ construction quality should ideally be considered.To ensure the ultimate delivery of high performance in practice, on site evaluation is essential and so were many field techniques proposed [10][11][12][13][14]. Amongst these, assessment of concrete's near-surface permeation characteristics is recognised as a reliable tool to qualify durability [4,10,14,15], because deterioration of reinforced concrete usually involves ingress of aggressive substances from the surrounding environment [3,5,7,11]. Air permeability tests have gained popularity in recent years due to their short test duration a...

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Section: Introductionmentioning

confidence: 99%

Development of a new in situ test method to measure the air permeability of high performance concretes

Yang

Basheer

Bai

et al. 2014

NDT & E International

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“…The authors have discussed as when and where to *Address correspondence to this author at the Annamalai University, Chidambaram, Tamilnadu, India; Tel: +919443282646; Emails: seshadrinsekhar@yahoo.com and seshadrinsekhar@gmail.com use high performance concrete by considering the factors such as shrinkage, curing, super plasticizer with cement. It was proposed that there are specific proportions for getting the required cylinder strengths for some countries [4]. HPC was designed through the minimum void ratio method, by replacing the cement with slag and silica fumes partially and 15% of sand by fly ash.…”

Section: Introductionmentioning

confidence: 99%

Influence of Water Binder Ratio on High Performance Concrete

Sekhar¹,

Raghunath²

2014

TOBCTJ

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High performance concrete M60 cubes of 150 mm X 150 mm X 150 mm were tested experimentally under static loading. With the variation in the water binder ratios of 0.25, 0.28, 0.33, 0.39 and hyper plasticizer of 0.6%. 0.8%. 1.0%, 1.2% the cubes were cast and accordingly the cylinders were cast. For each ratio of water binder, 12 cubes and 2 cylinders were cast. Out of 12 cubes, 3 cubes were cured for 7 days, 3cubes for 15 days, 3 cubes for 21 days and the balance 3 cubes for 28 days. All the cubes were tested in a 2000kn compression testing machine. The load deflection curves, stress-strain curves were drawn for each cube and cylinder. The average compressive strength of each mix for different number of days of curing were calculated. The modulus of elasticity was calculated for each design mix.

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“…The general aim of these applications is improving material properties, e.g. workability, setting time, water requirement and mechanical strength (Aitcin and Neville 2003;Jansen et al 2012;Young 1972), consequently producing high-strength and high-performance concretes (Jansen et al 2012;Li et al 2005;Neville and Aitcin 1998). The influence of admixed polymers on the properties of cement-based materials is reported to be mainly related to their dispersion ability via increasing repulsive forces and hindering the coagulation and sedimentation of the cement particles by introducing electrostatic and/or steric repulsion (Jansen et al 2012;Mollah et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

Koleva

et al. 2013

ACT

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The influence of limited concentration, of 0.025 wt.% per cement weight, poly (ethylene oxide) -block -polystyrene vesicles on the hydration process, microstructure and micromechanical properties of cement paste at early hydration age of maximum 7 days are discussed. Isothermal calorimetry and non-evaporable water content tests indicate that the admixed vesicles have no apparent influence on the process of cement hydration, but affect microstructural properties. Whereas nitrogen adsorption tests reveal that the gel pore structure of the vesicles-modified matrix is almost identical to the vesicles-free one, mercury intrusion porosimetry proves refined capillary porosity and reduced total porosity in the presence of admixed vesicles. Nano-indentation supports the above observations and indicates that the admixed vesicles act as nucleation sites, leading to a more uniform distribution of low density hydration products.

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High performance concrete—An overview

Cited by 221 publications

References 3 publications

Development of a new in situ test method to measure the air permeability of high performance concretes

Development of a new in situ test method to measure the air permeability of high performance concretes

Influence of Water Binder Ratio on High Performance Concrete

Early Age Hydration, Microstructure and Micromechanical Properties of Cement Paste Modified with Polymeric Vesicles

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