Evaporation, settlement, temperature evolution, and development of plastic shrinkage cracks in mortars with shrinkage-reducing admixtures

Lura, Pietro; Mazzotta, Giulio; Rajabipour, Farshad; Weiss, Jason

doi:10.1617/291214390x.023

Cited by 14 publications

(6 citation statements)

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“…The weight loss was determined by placing each sample on a scale and recording the mass change owing to water evaporation per unit of weight at different aging times. The effect of the addition of SRA to water on the evaporation rate of deionised water appeared to be negligible during the first few hours [12]. Similar results were observed for the weight loss, but for extended testing periods.…”

Section: Evaporation Of Solutions and Mortarssupporting

confidence: 78%

“…Several studies have demonstrated that the addition of SRAs is a reliable method for reducing autogenous [7,10,11] and plastic shrinkage [12][13][14][15] and are even more effective for controlling drying shrinkage [16]. Several theories could be used to explain the shrinkage reducing effects of SRAs from different points of view; however, the consensus is that the shrinkage reducing effects of SRAs are due to the their ability to lower the surface tension of pore solutions in cementitious materials [17].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have demonstrated that the shrinkage reducing effect of SRAs is related to the environmental or internal relative humidity (RH). Thus, many studies have focused on the SRAs' functions under varied humidity conditions [2,12,[19][20][21][22]. For example, SRAs can reduce the sorptivity and wetting moisture diffusivity of cementitious materials by improving the viscosity of their pore solutions [18].…”

Section: Introductionmentioning

confidence: 99%

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Monitoring the Whole Cycle Length Change of Cement Mortar Incorporated with SRA by CMOS Image Sensor

Hao

Yao

Wang

et al. 2020

Sensors

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This paper introduces a new method to measure whole cycle length change non-destructively and continuously using a digital image analysis system. The macroscale length changes of mortars containing different shrinkage-reducing admixture (SRA) dosages (0%, 1%, 2% and 5% by cement weight) were first determined using a complementary metal oxide semiconductor (CMOS) image sensor under alternating dry and wet curing conditions. After that, the length change was calculated using developed digital image processing technology (DIPT) software. After that, several significant conclusions could be drawn by combining with the results of systematic tests of the macroscopic and microscale physical properties of the cement mortar using X-ray diffraction, scanning electron microscopy, mercury intrusion porosimetry (MIP) and nuclear magnetic resonance (NMR) methods. The test results indicated that SRAs exhibited significant effects on the shrinkage inhibition of cement mortars, whereas the shrinkage reduction behaviour was also affected by varying the curing conditions. The MIP and NMR analyses demonstrated that SRAs reduced the irreversible shrinkage of the cement mortars by decreasing the volume percentage of the 3–50 nm pores and promoting the conversion of calcium silicate hydrate gel from an oligomeric to a high polymerization state thereby improving the volume stability of cement mortars.

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Section: Evaporation Of Solutions and Mortarssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Monitoring the Whole Cycle Length Change of Cement Mortar Incorporated with SRA by CMOS Image Sensor

Hao

Yao

Wang

et al. 2020

Sensors

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“…The physical process leading to plastic shrinkage of cementitious materials is the build-up of a hydraulic pressure in the liquid phase of the material [3][4][5][6]. Chemical reactions do not have a decisive influence on this early age process.…”

Section: Capillary Pressure Build-up and Early Age Crackingmentioning

confidence: 99%

Capillary pressure in fresh cement-based materials and identification of the air entry value

Slowik

Schmidt

Fritzsch

2008

Cement and Concrete Composites

176

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“…Plastic settlement cracking presented multiple tensile surface cracks and shear cracks while plastic shrinkage cracking exhibited a single crack pattern throughout the entire depth of the concrete. Lura et al (2006) measured the settlement of mortar containing shrinkage-reducing admixture (SRA) using non-contact laser system. The addition of SRA reduces the settlement resulting in a reduction of plastic shrinkage cracks due to differential settlement.…”

Section: Introductionmentioning

confidence: 99%

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Azenha¹,

Schlicke²,

Benboudjema³

et al. 2019

ACT

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This special issue of the Journal of Advanced Concrete Technology presents seven invited journal papers, which were selected on basis of outstanding conference contributions during the International RILEM/COST conference SynerCrete'18, held on 24-26 October 2018 in Funchal, Madeira Island, Portugal, which gathered 183 participants. The selection was made by the scientific committee and the chairpersons among 184 contributions. The conference itself dealt with interdisciplinary approaches for cement-based materials and structural concrete, intending to provide added value through collaborations across the entire field of structural concrete-ranging from concrete technology, over simulation and structural design, production and building, up to operation, monitoring and maintenance. Exciting fields of research such as performance-based design, 3D modelling for analysis/design, Building Information Modelling and even robotics (e.g. digital fabrication or robotics design) were included, while retaining focus on multi-scale approaches at time and spatial levels. Overall, the hereby promoted journal papers are representative for the successful balance act between a great versatility of the conference contributions and the targeted synergizing of expertise aiming on the ultimate goal of reliable and durable concrete structures. SynerCrete'18 also marked the end of COST Action TU1404 "Towards the next generation of standards for service life of cement-based materials and structures" (www.tu1404.eu), offering a final forum to the discussions raised during the funded period of the Action from 2014 to 2018. A sense of accomplishment was felt by all the members of the Action, in the view of the important achievements of networking tools that were brought about by the extended Round Robin Testing Programme (RRT+), the Numerical Benchmarking Activities and 24 Short Term Scientific Missions (STSMs). Some of the selected papers in this special issue are the result of fruitful collaborations initiated by COST Action TU1404. A further remark in regard to the wide international institutional support that this conference attained, is about the direct support of RILEM, fib, JCI and ACI. Specifically, with regard to the Japanese Concrete Institute, a mention is given to the special session dedicated to the most recent version of "JCI Guidelines for Control of Cracking of Mass Concrete", as it was indeed one of the most inspiring documents that influenced the genesis of COST Action TU1404.

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Evaporation, settlement, temperature evolution, and development of plastic shrinkage cracks in mortars with shrinkage-reducing admixtures

Cited by 14 publications

References 0 publications

Monitoring the Whole Cycle Length Change of Cement Mortar Incorporated with SRA by CMOS Image Sensor

Monitoring the Whole Cycle Length Change of Cement Mortar Incorporated with SRA by CMOS Image Sensor

Capillary pressure in fresh cement-based materials and identification of the air entry value

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

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