Properties of early-age concrete relevant to cracking in massive concrete

Maruyama, Isao; Lura, Pietro

doi:10.1016/j.cemconres.2019.05.015

Cited by 148 publications

(37 citation statements)

References 170 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In that context, the shrinkage can be computed once the thermal deformation is removed from the specimens’ deformation. To do so, the coefficient of thermal expansion (CTE), which varies at early age [ 36 , 37 , 38 ], must be defined.…”

Section: Resultsmentioning

confidence: 99%

Shrinkage Mitigation of an Ultra-High Performance Concrete Submitted to Various Mixing and Curing Conditions

Androuët

Charron

2021

Materials

View full text Add to dashboard Cite

Ultra-High Performance Concretes (UHPC) are cement-based materials with a very low water-to-binder ratio that present a very-high compressive strength, high tensile strength and ductility as well as excellent durability, making them very interesting for various civil engineering applications. However, one drawback of UHPC is their pretty high autogenous shrinkage stemming from their very low water-to-binder ratio. There are several options to reduce UHPC shrinkage, such as the use of fibers (steel fibers, polypropylene fibers, wollastonite microfibers), shrinkage-reducing admixtures (SRA), expansive admixtures (EA), saturated lightweight aggregates (SLWA) and superabsorbent polymers (SAP). Other factors related to curing conditions, such as humidity and temperature, also affect the shrinkage of UHPC. The aim of this paper is to investigate the impact of various SRA, different mixing and curing conditions (low to moderate mixing temperatures, moderate to high relative humidity and water immersion) as well as different curing starting times and durations on the shrinkage of UHPC. The major importance of the initial mixing and curing conditions has been clearly demonstrated. It was shown that the shrinkage of the UHPC was reduced by more than 20% at early-age and long-term when the fresh UHPC temperature was closer to 20 °C. In addition, curing by water immersion led to drastic reductions in shrinkage of up to 65% and 30% at early-age and long-term, respectively, in comparison to a 20% reduction for fog curing at early-age. Finally, utilization of a liquid polyol-based SRA allowed for reductions of 69% and 63% of early-age and long-term shrinkages, respectively, while a powder polyol-based SRA provided a decrease of 47% and 35%, respectively.

show abstract

Section: Resultsmentioning

confidence: 99%

Shrinkage Mitigation of an Ultra-High Performance Concrete Submitted to Various Mixing and Curing Conditions

Androuët

Charron

2021

Materials

View full text Add to dashboard Cite

show abstract

“…Moreover, constant of thermic growth is a least situation and now rise by waterlessness. Figure 6 shows the formal shape for the fracturing of mass concrete (Maruyama and Lura, 2019;Zhang et al, 2015;2017). Figure 7 shows Aggregate's influence in concrete (Metha and Monteiro, 2006).…”

Section: Mixing Percentagementioning

confidence: 99%

Improve the Consumption of Cement and Sand in Massive Concrete

Ostad‐Ali‐Askari¹,

Niknejadi²,

Ashrafi³

et al. 2021

American Journal of Engineering and Applied Sciences

View full text Add to dashboard Cite

“…Furthermore, the modelling of temperature related cracking in massive structures is known to be strongly dependent on a precise maturity model [4,9,10] that covers the full range of temperatures to be expected inside a massive concrete structure. From the observations in the present test series it is concluded that further research is needed on the temperature effects on the later-age strengths and the cross-over effect.…”

Section: Supplementary Testsmentioning

confidence: 99%

Activation Energy for the Concrete Maturity Model – Part 2: New Model for Temperature Dependent E_a

Nielsen

2020

Nordic Concrete Research

View full text Add to dashboard Cite

The article addresses the modelling of the maturity of concrete. The apparent activation energy is the backbone of the Arrhenius model, which is typically used to model the maturity of concrete. The maturity (or the equivalent age) is influenced by the curing temperature and it is applied when modelling the hydration process and the hardening of concrete for instance in order to forecast the early-age strength to determine the time for removal of formwork or the time for prestressing. Part 1 of the article describes the background for the maturity model and the tests carried out as part of a large test programme at the DTI concrete lab. The tests were applying iso-thermal curing temperatures from 5°C to 60°C for various durations before measuring the compressive strength.Part 2 of the article presents a model for the activation energy based on these test results. An alternative formulation of the maturity model is suggested and compared with other similar concrete tests found in the literature for early-age strengths. The alternative model is shown to give better accuracy when modelling the early-age strengths of concrete. The tests include five different concretes, using three different cement types and the addition of fly ash.

show abstract

Properties of early-age concrete relevant to cracking in massive concrete

Cited by 148 publications

References 170 publications

Shrinkage Mitigation of an Ultra-High Performance Concrete Submitted to Various Mixing and Curing Conditions

Shrinkage Mitigation of an Ultra-High Performance Concrete Submitted to Various Mixing and Curing Conditions

Improve the Consumption of Cement and Sand in Massive Concrete

Activation Energy for the Concrete Maturity Model – Part 2: New Model for Temperature Dependent E_a

Contact Info

Product

Resources

About

Properties of early-age concrete relevant to cracking in massive concrete

Cited by 148 publications

References 170 publications

Shrinkage Mitigation of an Ultra-High Performance Concrete Submitted to Various Mixing and Curing Conditions

Shrinkage Mitigation of an Ultra-High Performance Concrete Submitted to Various Mixing and Curing Conditions

Improve the Consumption of Cement and Sand in Massive Concrete

Activation Energy for the Concrete Maturity Model – Part 2: New Model for Temperature Dependent Ea

Contact Info

Product

Resources

About

Activation Energy for the Concrete Maturity Model – Part 2: New Model for Temperature Dependent E_a