A poromechanics model for plastic shrinkage of fresh cementitious materials

Ghourchian, Sadegh; Wyrzykowski, Mateusz; Lura, Pietro

doi:10.1016/j.cemconres.2018.04.013

Cited by 53 publications

(43 citation statements)

References 44 publications

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“…Cement composition, is another important factor that may explain the evaporation results. It has been observed that higher amount of C3A in cement, reduces the bleeding of the concrete [32], due to the accelerated hydration and the consequent reduction of the intrinsic permeability of the matrix [33]. Hence, the significant increase in the evaporation of REFA, compared to REF (Figure 7), can be attributed to its presumably higher permeability due to the lower C3A content and coarser particles, see Table 2.…”

Section: Influence Of Cement Typementioning

confidence: 97%

Plastic Shrinkage Cracking of Self-compacting Concrete: Influence of Capillary Pressure and Dormant Period

Sayahi

Emborg²,

Hedlund

et al. 2019

Nordic Concrete Research

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This research investigates the effect of capillary pressure and the length of the hydration dormant period on the plastic shrinkage cracking tendency of SCC by studying specimens produced with different w/c ratios, cement types and SP dosages. A relationship between the capillary pressure rate and the length of the hydration dormant period is defined, which can explain the cracking severity of the concrete when the volumetric deformation is unknown. The results show, that the cracking tendency of SCC was the lowest in case of w/c ratio between 0.45 and 0.55, finer and more rapid hardening cement, and lower dosage of SP. The dormant period was prolonged by increasing the w/c ratio, using coarser cement, and higher SP dosage. It was concluded that the cracking tendency of concrete is a function of the capillary pressure buildup rate and the length of the dormant period.

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Section: Influence Of Cement Typementioning

confidence: 97%

Plastic Shrinkage Cracking of Self-compacting Concrete: Influence of Capillary Pressure and Dormant Period

Sayahi

Emborg²,

Hedlund

et al. 2019

Nordic Concrete Research

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“…In the massive calcium hydroxide (CH) crystals, and the hydration products in GCM in the SSCND–cement were similar to the cement gelled materials. The needle-shaped AFt crystals and flocculation C-S-H gel overlap each other to form space net structure, and populate the hardening of the phase surface, hole, crack, the unreacted dihydrate gypsum, and smelting slag particles knot together to form an integrated part, thus improving the strength of the GCM [41,42].…”

Section: Resultsmentioning

confidence: 99%

Experimental Studies on Chemical Activation of Cementitious Materials from Smelting Slag of Copper and Nickel Mine

Wang

Wei

et al. 2019

Materials

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Gellable composite materials (GCM) were prepared from a smelting slag of copper and nickel deposits and cement, and activated using gypsum and chemical activators. The effects of material ratio, dosage of chemical activators, and gypsum on the mechanical properties of GCM were studied. Our results showed that the chemical activators of Na2SO4, Na2SiO3, NaOH, and Na2CO3 could improve the compressive strength of the GCM. Considering the market cost and ease operation, the compressive strength of the GCM could be significantly improved with 2% Na2SO4. The experiment results also showed that the compound chemical activator could improve the compressive strength of gelled material. The strength of GCM reaches 41.6 MPa when 2% gypsum and 80% of smelting slags of copper and nickel deposits were used, which met the national standards requirements of GCM. As such, it is expected that a large amount of copper and nickel mining smelting slag could be utilized for the production of cementitious materials.

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“…There are also models available for estimating the time of final set [32], which can be used in eq. (2), coupled with the maturity concept to incorporate the effect of temperature [17,33,34].…”

Section: Improvement Of the Aci Nomograph Approach 2 Based On The Frementioning

confidence: 99%

“…Therefore, the ACI nomograph is likely not able to provide accurate estimations of the rate of evaporation of concrete, at least not after the bleed water is removed completely from the surface of the concrete [7,13,16]. It is noticed that the CRP continues for some time after the disappearance of the bleed water from the concrete surface, as long as the concrete's intrinsic permeability is constant [14,17]. On the other hand, some studies showed that the evaporation rate of concrete samples during the CRP agreed well [14,15], or was even higher [18] than estimations based on the nomograph.…”

Section: Introductionmentioning

confidence: 99%

“…To address the complex problem of plastic shrinkage cracking, the strategy of modeling fresh concrete following a poromechanics framework has been used in the PhD project of the first author, see also [14,17,21,30,31]. In fact, the proposed model is able to couple the material properties and the geometry of a concrete element with the environmental factors, to finally estimate the cracking risk.…”

Section: Introductionmentioning

confidence: 99%

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A practical approach for reducing the risk of plastic shrinkage cracking of concrete

Ghourchian¹,

Wyrzykowski

Lura

2017

RILEM Tech Lett

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In this letter, a conventional method for mitigation of plastic shrinkage of fresh concrete based on comparing bleeding and evaporation rates (the former based on the commonly observed values of bleeding rate and the latter estimated by means of the commonly-used ACI nomograph) is critically assessed. It is shown that even if the initial bleeding rates are sufficiently high (i.e. higher than the evaporation rates), cracking may still occur if all the bleed water is lost by evaporation between the times of initial and final set, leading to the rise of capillary pressure. An alternative and more conservative method should be thus based on the total (accumulated) amount of bleed water compared to the total amount of evaporated water. The former should take into account the concrete's properties and the geometry of the member, while the latter can be assumed based on the nomograph method.

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A poromechanics model for plastic shrinkage of fresh cementitious materials

Cited by 53 publications

References 44 publications

Plastic Shrinkage Cracking of Self-compacting Concrete: Influence of Capillary Pressure and Dormant Period

Plastic Shrinkage Cracking of Self-compacting Concrete: Influence of Capillary Pressure and Dormant Period

Experimental Studies on Chemical Activation of Cementitious Materials from Smelting Slag of Copper and Nickel Mine

A practical approach for reducing the risk of plastic shrinkage cracking of concrete

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