The influence of initial water curing on the strength development of ordinary portland and pozzolanic cement concretes

Ozer, Baris; Özkul, M. Hulusi

doi:10.1016/s0008-8846(03)00185-6

Cited by 80 publications

(29 citation statements)

References 4 publications

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“…The mixtures would show higher strength if they were moist cured. This improvement would be more pronounced in mixtures containing the pozzolan as reported in the literature (Ozer and Ozkul 2004). …”

Section: Free Shrinkage and Temperature Developmentsupporting

confidence: 63%

Early Age Stress Development, Relaxation, and Cracking in Restrained Low W/B Ultrafine Fly Ash Mortars

Hossain

Fonseka

Bullock

2008

ACT

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This paper describes an experimental study that investigated the influence of ultrafine fly ash (UFFA), a relatively new pozzolanic admixture, on the early age stress development, stress relaxation, and cracking in restrained low water-tobinder ratio (w/b) mortars due to shrinkage. The restrained ring test was used to assess the early age residual stress development in mortar ring specimens. In addition, free shrinkage strain, elastic modulus, and splitting tensile strength measurements were performed to assess the stress relaxation (creep effect) and cracking potential. It was found that the restrained mortar mixtures containing the typical fly ash (FA) (ASTM Type-F) or the ultrafine fly ash demonstrated lower levels of residual tensile stress than the control mixture. Also, both typical fly ash mortar and ultrafine fly ash mortars demonstrated a reduction in free shrinkage. In addition, an increase in the age of cracking and a decrease in stress relaxation (creep effect) were observed in the restrained mortar ring specimens containing FA or UFFA. However, at equal replacement of cement with either FA or UFFA, the delay in the age of cracking and the reduction in stress relaxation were higher for the UFFA modified mortar.

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Section: Free Shrinkage and Temperature Developmentsupporting

confidence: 63%

Early Age Stress Development, Relaxation, and Cracking in Restrained Low W/B Ultrafine Fly Ash Mortars

Hossain

Fonseka

Bullock

2008

ACT

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“…The stress created as a result of volume changes in the concrete at its early age can lead to the appearance of microscopic defects in the internal structure of the concrete, which further affects the development of its mechanical properties. A similar stagnation in the material properties of the uncured concrete compared with a cured one was also published by the authors of papers 24,25 , where the parameter observed was the compressive strength. Insufficient concrete curing was also reflected in the final values of the elastic modulus at the later ages of the concrete.…”

Section: Resultssupporting

confidence: 68%

“…It was demonstrated that curing time (not only the curing method) also substantially influences the resulting values of the concrete's material properties. 24,25 The composition, the water content, the curing method and the time are interlinked throughout the whole duration of the concrete ageing and can be considered as influential factors, which affect the final value of its modulus of elasticity. 21 Another aspect, which is reflected in the final value of the modulus of elasticity, is the choice of the test method for its determination.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the influence of concrete curing on the development of its elastic modulus over time

Kocáb¹,

Králíková²,

Cikrle³

et al. 2017

Mater. Tehnol.

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The modulus of elasticity is one of the most important properties of concrete, especially during structural analyses of buildings. It is, among others, an important parameter in the calculation of the concrete-element deflection or during the design of pre-or post-tensioned structures. The modulus of elasticity is not a specific number. It is a property with a high variability of the final values, which depend on the concrete composition (together with other factors). Some of the significant factors, which influence the final value of the elastic modulus of concrete, are also the means and quality of its curing, especially at the early stage of its setting and hardening. Apart from maintaining the temperature within the correct limits, it is important to focus on the moisture content of concrete while it is being cured. The purpose of the experiment described herein was to determine the development of the dynamic as well as static modulus of elasticity for structural concrete while using different curing methods. The experiment used four series of beam specimens with nominal dimensions of 100 × 100 × 400 mm made from air-entrained and non-air-entrained concretes of the C 30/37 strength class. A half of the specimens in each series aged in laboratory conditions and the other half was stored under water. Based on the evaluation of the experimental measurements, it can be said that the manner of storage has a significant influence on the development and final values of the static and dynamic modulus of elasticity. Keywords: concrete, curing, modulus of elasticity, compressive strength Ena od najpomembnej{ih lastnosti betona je modul elasti~nosti. Njegovo poznavanje je {e posebej pomembno za strukturno analizo stavb. To je, med drugim, pomemben parameter pri izra~unu deformacij betonskih elementov pred ali med oblikovanjem prednapetih struktur. Modul elasti~nosti ni specifi~na {tevilka; je lastnost z zelo razli~nimi kon~nimi vrednostmi, ki so odvisne od sestave betona (skupaj z drugimi dejavniki). Pogoji njegovega utrjevanja so zelo pomembni. Vplivajo na kon~no velikost elasti~nega modula betona, zlasti v zgodnji (za~etni) fazi utrjevanja. Razen ohranjanja temperature v pravilnih mejah, se je pomembno osredoto~iti na vsebnost vlage v betonu, medtem, ko se le-ta utrjuje. Namen opisanega preizkusa je bil dolo~iti tako razvoj dinami~nega kot tudi stati~nega modula elasti~nosti konstrukcijskega betona, z uporabo razli~nih metod utrjevanja. V preizkusu so bile uporabljene {tiri serije preizku{ancev v obliki nosilcev z nazivnimi dimenzijami 100 mm × 100 mm × 400 mm, izdelanih iz zra~no tretiranih in netretiranih betonov iz trdnostnega razreda C 30/37 (N/mm 2 ). Polovica vzorcev v vsaki seriji je bila starana v laboratorijskih pogojih, druga polovica pa je bila shranjena v vodi. Na podlagi vrednotenja eksperimentalnih meritev, lahko re~emo, da na~in shranjevanja pomembno vpliva na razvoj in kon~ne vrednosti stati~nega in dinami~nega modula elasti~nosti.

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“…Experimental Study on the Use of Trass as a Supplementary Cementitious Material in Pervious Concrete 43 (1) where k is the permeability coefficient, a is the cross-sectional area of the standpipe (1,618.01 mm 2 ), L is the vertical distance of the measuring points of the specimen (200 mm), A is the cross area of the pervious concrete specimen (7,850 mm 2 ), t is the time taken for the head to fall from h 0 to h 1 , h 0 is the initial water head and h 1 is the final water head.…”

Section: Water Permeabilitymentioning

confidence: 99%

“…The manufacturing of Portland cement is an energy consuming process (approximately 4GJ energy per ton) releasing a considerable amount of carbon dioxide, which is a major contributor to the greenhouse gas emissions that leads to global climate change [2][3][4]. Today, many countries agree to reduce the emission of CO 2 [1]. It is sometimes debated whether the concrete can or should be considered as a sustainable option due to its particular properties and characteristics.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Use of Trass as a Supplementary Cementitious Material in Pervious Concrete

Joshaghani¹,

Moazenian²,

Shuaibu³

2017

JESE-A

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Abstract:The purpose of this paper is to evaluate the suitability of using trass as a supplementary cementing material in pervious concrete. OPC (Ordinary Portland Cement) was replaced in the concrete mix by 15%, 25% and 35% weight percentages and the results were compared with reference mixtures with 100% Portland cement. The variables in this study were trass content, aggregate size and water to cement ratio. Sixteen cases of concrete mixtures were tested to study physical and mechanical properties of hardened concrete, including porosity, permeability, compressive strength, splitting-tensile strength and flexural strength at various ages. Results indicated that mechanical properties of the pervious concrete marginally decreased with the increased content of trass when compared to the reference mixtures. However, at later ages the differences were insignificant.

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The influence of initial water curing on the strength development of ordinary portland and pozzolanic cement concretes

Cited by 80 publications

References 4 publications

Early Age Stress Development, Relaxation, and Cracking in Restrained Low W/B Ultrafine Fly Ash Mortars

Early Age Stress Development, Relaxation, and Cracking in Restrained Low W/B Ultrafine Fly Ash Mortars

Experimental analysis of the influence of concrete curing on the development of its elastic modulus over time

Experimental Study on the Use of Trass as a Supplementary Cementitious Material in Pervious Concrete

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