The differential drying shrinkage effect on the concrete surface damage: Experimental and numerical study

Samouh, Hamza; Rozière, Emmanuel; Loukili, Ahmed

doi:10.1016/j.cemconres.2017.09.016

Cited by 34 publications

(13 citation statements)

References 43 publications

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“…The cracking capacity of early-age concrete is also affected by the factors such as temperature development, water-cement ratio, and structure size, which will affect the mechanical properties of early-age concrete, and a series of studies have been conducted [ 11 , 29 , 32 ]. These factors influencing the new estimation method can be studied in the future.…”

Section: Resultsmentioning

confidence: 99%

“…The cracking frame mainly concentrated on the stress and strain development of concrete under temperature control and self-generated shrinkage deformation [ 10 , 11 ]. Moreover, it analyzed mechanical properties, such as the influence of elastic modulus, creep or stress relaxation, thermal expansion coefficient, thermal conductivity coefficient, and exert influences on the cracking sensitivity of concrete [ 9 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Research on the Crack Risk of Early-Age Concrete under the Temperature Stress Test Machine

et al. 2018

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A new temperature stress test machine (TSTM) was developed to improve temperature control accuracy and efficiency. As there is no uniform standard for the threshold value of TSTM, quite different threshold values are used in the test, which results in the influences of the threshold value on the evaluation of thermal stresses and crack risk of concrete not being determined. To illustrate the importance of an appropriate threshold value, different threshold values were used to evaluate the influences on the thermal stresses and cracking resistance of concrete specimens under a complete restraint test with semi-adiabatic temperature development. The results show that the maximum compressive stress of a concrete specimen with a threshold value 3 με was slightly larger than that of 1.5 με when the growth rate of tensile stress of the concrete specimen with the threshold value 3 με was slightly greater than that of concrete specimen with the threshold value 1.5 με. Based on the combination of crack risk coefficient and restraint degree, a new system for evaluating the crack resistance of concrete was proposed, in which different threshold values were used to estimate their influences on the crack risk of concrete. Thus, an appropriate range of threshold values could be determined.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Crack Risk of Early-Age Concrete under the Temperature Stress Test Machine

et al. 2018

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“…Due to moisture gradient, differential drying shrinkage might occur in concrete, which could also cause microcracking in concrete [35]. For the purpose of reducing the moisture gradient through the thickness, the concrete and mortar specimens were cut as slices (thickness = 10 mm) with a cutting machine.…”

Section: Dic Measurementmentioning

confidence: 99%

Effect of coarse aggregate size on non-uniform stress/strain and drying-induced microcracking in concrete

Gao

Chen

Huang

et al. 2021

Composites Part B: Engineering

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Non-uniform stresses, strains and microcracking of the concretes with three coarse aggregate sizes (5-10 mm, 10-16 mm, 16-20 mm) dried under 40% relative humidity (RH) for 60 days were quantified using digital image correlation and lattice fracture modelling. The influencing mechanism of coarse aggregate size on the dryinginduced microcracking of concrete was clarified: (1) As the coarse aggregate size decreases, propagation paths of microcracking are increased, which increase the number of small microcracks and release the drying shrinkage force from mortar phase. (2) Tensile stress shells surrounding the coarse aggregates become thinner, thereby decreasing the area of large microcracks. As the coarse aggregate size decreased from 16-20 mm to 5-10 mm, the average thickness of tensile stress shells decreased from 2.13 mm to 1.09 mm at the beginning of drying, and the area of the microcracks >5 μm in width decreased from 796.6 mm 2 /m 2 to 340.2 mm 2 /m 2 at 60 days since drying.

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“…Given the water-to-cement ratio of 0.45 (see Table 1), free water remains in the pores even after the complete hydration of cement [44]. The decrease of relative humidity in concrete due to external drying is a relatively slow phenomenon, even at a depth of a few centimeters (see [45]). Given the stability of RH over the long term (here between 98% and 100% of relative humidity), the RH of studied beam was still not affected by external drying.…”

Section: In Situ Measurement Of Relative Humidity and Temperaturementioning

confidence: 99%

Monitoring of a Reinforced Concrete Wharf Using Structural Health Monitoring System and Material Testing

Lecieux

Rozière

Gaillard

et al. 2019

JMSE

Self Cite

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This paper presents the Structural Health Monitoring (SHM) system developed for a port wharf of a freight terminal, in Saint-Nazaire, France. This concrete structure has been equipped with a multi-sensor system for the monitoring of concrete ageing. The measurement chain is designed to detect the penetration of chloride ions in order to quantify the risk of reinforcement bars corrosion. Modifications of the mechanical behavior of the structural elements of the wharf are also monitored. At first, the sensors embedded within the structure and the acquisition devices are described. The data from the monitoring performed during the first months of the structure service life are then presented. The concrete monitoring at early age providing data like temperature history, strain and resistivity is useful both for the wharf owner and the construction company since it indicates where concrete shrinkage is likely to cause cracking and gives an indicator of material hardening. These data were compared to the results of material tests carried out on concrete. The study shows that a measurement chain dedicated to the SHM could be a useful tool for validating the quality of the construction of a reinforced concrete structure before being used in the framework of long-term monitoring.

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The differential drying shrinkage effect on the concrete surface damage: Experimental and numerical study

Cited by 34 publications

References 43 publications

Research on the Crack Risk of Early-Age Concrete under the Temperature Stress Test Machine

Research on the Crack Risk of Early-Age Concrete under the Temperature Stress Test Machine

Effect of coarse aggregate size on non-uniform stress/strain and drying-induced microcracking in concrete

Monitoring of a Reinforced Concrete Wharf Using Structural Health Monitoring System and Material Testing

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