The severity of plastic shrinkage cracking in concrete: a new model

Sayahi, Faez; Emborg, Mats; Hedlund, Hans; Ćwirzeń, Andrzej; Stelmarczyk, Marcin

doi:10.1680/jmacr.19.00279

Cited by 17 publications

(16 citation statements)

References 18 publications

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“…the period between the drying time and the mixtures initial set, see Fig. 1, the higher the cracking potential and vice versa (Sayahi et al, 2019). The critical period is defined as:…”

Section: Model Derivationmentioning

confidence: 99%

“…Where t cr is the critical period (min), t is time (min), t ini is the initial setting time (min), t d is the drying time (min), E is the evaporation (kg/m 2 ), and B is the bleeding (kg/m 2 ). (Sayahi et al, 2019) Assuming that cracking tendency of plastic cement-based materials increases with a higher rate of capillary pressure build-up, alongside delayed initial set and longer critical period, the following similarity is proposed:…”

Section: Model Derivationmentioning

confidence: 99%

“…2), and the upwards transferred water, W b (the water volume between curves 2 and 3 in Fig. 2) (Radocea, 1992;Sayahi et al, 2019). 4Where W e is the total amount of the evaporated water in a single pore (kg/m 2 ), and W b is the total amount of the upwards transferred water in a single pore (kg/m 2 ).…”

Section: Model Derivationmentioning

confidence: 99%

“…4, E(t) is the total evaporation at time t (kg/m 2 ), and B(t) is the total bleeding at time t (kg/m 2 ). Figure 4: Definition of W p (t), from (Sayahi et al, 2019) In eq. 7, the product of the multiplication of (dW p /dt) and (t ini -t d ), is the total amount of the water evaporated from inside the pore system at the initial set.…”

Section: Model Derivationmentioning

confidence: 99%

“…The initial setting time may be experimentally determined before the placement by using Vicat needle apparatus or ultrasonic waves (Carette & Staquet, 2015), or after casting by determining the inflection point of the internal temperature curve. (Sayahi et al, 2019) One limitation of the proposed model is that the restrain degree of the concrete is assumed constant for all the specimens. In addition, the effect of hydration, i.e.…”

Section: Model Derivationmentioning

confidence: 99%

See 4 more Smart Citations

Modelling the Severity of Plastic Shrinkage in Cementitious Materials

Sayahi¹,

Emborg²,

Hedlund³

et al. 2020

Proceedings of the International Conference on Civil Infrastructure and Construction (CIC 2020)

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Plastic shrinkage cracking in cement-based materials occurs between the mixing and the final setting of the mixture, where rapid evaporation of the mixed water is the main cause behind the phenomenon. The induced cracks may impair the durability and sustainability of the structure by facilitating ingress of harmful materials into the concrete bulk. In this paper a new model for estimating the cracking severity of plastic cementitious materials is presented based on the mixture's initial setting time and the amount of the pore liquid evaporated from within the concrete mass. Results of experiments performed by the authors in another study, in addition to results of tests performed by other researchers are used to control the validity of the model. It is concluded that the model can anticipate the cracking severity of plastic concretes with good precision. The new method can provide practical tools for designers and contractors to predict and compare the cracking risk of the concretes prior to casting.

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“…the period between the drying time and the mixtures initial set, see Fig. 1, the higher the cracking potential and vice versa (Sayahi et al, 2019). The critical period is defined as:…”

Section: Model Derivationmentioning

confidence: 99%

Section: Model Derivationmentioning

confidence: 99%

Section: Model Derivationmentioning

confidence: 99%

Section: Model Derivationmentioning

confidence: 99%

Section: Model Derivationmentioning

confidence: 99%

See 3 more Smart Citations

Modelling the Severity of Plastic Shrinkage in Cementitious Materials

Sayahi¹,

Emborg²,

Hedlund³

et al. 2020

Proceedings of the International Conference on Civil Infrastructure and Construction (CIC 2020)

Self Cite

View full text Add to dashboard Cite

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Plastic settlement and hardened state assessments of manufactured sand made concrete for varying microfine levels

Arulmoly

Konthesingha

Nanayakkara

2022

Structural Concrete

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Manufactured sand (MS) has been started utilizing as an alternative in constructions due to the escalated demand for river sand (RS). The microfine aggregate (MFA) is a salient constituent in manufactured sand, which is a crushed reactive form of parent rocks having particles less than 0.075 mm. This paper presents the effects of varying microfine aggregate levels on bleeding, plastic shrinkage cracking (PSC) and compressive strength of MS made concrete. Two types of MS were utilized: MS from Hornblende‐Gneiss rock (MH) and MS from Charnockite rock (MC) and the MFA level was ranged from 0% to 12% at 3% increments and the reference concrete was prepared with RS alone. With the MFA levels, the bleeding of MS concretes was reduced where, at 0% MFA level the maximum bleeding rates were observed for MC (1.63 kg/m2) and MH (0.84 kg/m2) concretes. PSC results were analyzed from an image processing technique, which revealed an increasing trend of mean and maximum crack widths, crack length and crack area with the MFA levels. At 0% MFA, the mean crack width of MC (0.19 mm) and MH (0.17 mm) concretes manifested marginally similar to RS concrete (0.17 mm). The decreasing bleeding with the MFA levels can be attributed to the increasing severity to PSC. Moreover, the optimum 28 days compressive strength of MC (57.5 MPa) and MH (56.1 MPa) concretes was achieved at 3% MFA level which are higher than RS concrete (51.5 MPa). Consequently, the MFA level should be limited to 3% for better plastic and hardened performance of MS made concrete.

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