Internal curing of mortars by lightweight aggregates and its effects on hydration

Akcay, Burcu; Taşdemi̇r, Mehmet Ali

doi:10.1139/l08-078

Cited by 18 publications

(4 citation statements)

References 19 publications

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“…Philleo [11] was the first to propose that pre-wetting porous aggregate can effectively reduce autogenous shrinkage. These findings were then confirmed by other researchers [7,20,21,24,26,52,[70][71][72][73][74][75][76]. Bentur et al [20] found that when the amount of fine LWA replacement for normal weight aggregate reached 25%, it could completely eliminate autogenous shrinkage of HPC, but Geiker et al [75] reported that value to be 20%.…”

Section: Autogenous Shrinkagesupporting

confidence: 56%

An overview on the effect of internal curing on shrinkage of high performance cement-based materials

Liu

Shi

et al. 2017

Construction and Building Materials

194

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High performance cement-based materials, such as high or ultra-high performance concrete (HPC or UHPC) have been widely used and still faces the risk of cracking caused by shrinkages, especially autogenous shrinkage. Internal curing is an effective method to reduce or even eliminate autogenous shrinkage and has effects on chemical shrinkage, dry shrinkage, etc. The commonly used internal curing materials include super-absorbent polymer (SAP) and porous materials. Porous materials refer to lightweight aggregate (LWA) and porous superfine powders. In this paper, the internal curing materials has been divided into two categories based on water absorbing mechanism. The effects of these two categories of internal curing materials on shrinkage of high performance cement-based materials are reviewed. The addition of internal curing materials releases internal curing water, postpones the drop of internal RH, and reduces autogenous shrinkage, but increase chemical shrinkage. The addition of internal curing materials with extra water increases drying shrinkage. The mechanisms of shrinkage on internal curing are also summarized and discussed. However, those mechanisms only focus on certain type of shrinkage. To reduce the risk of cracking more effectively, the relationship of different type of shrinkages should be established.

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Section: Autogenous Shrinkagesupporting

confidence: 56%

An overview on the effect of internal curing on shrinkage of high performance cement-based materials

Liu

Shi

et al. 2017

Construction and Building Materials

194

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“…The addition of prewetted LWAs delayed the time when the peak temperature was reached. A similar finding in previous work 62 suggests that the hydration heat increases slightly and the time to reach the maximum internal temperature (between 15 and 20 h) is longer as the proportion of LWAs increases.…”

Section: Influence Of Prewetted Lwas On Temperature Historysupporting

confidence: 90%

“…59,72 A similar finding was reported in previous work, 73 which suggests that adding presoaked LWAs into concrete can decrease the shrinkage and ensure the relatively more even distribution of shrinkage strain, particularly in concrete adding more presoaked LWAs. Another finding in previous work 62 also suggests that the autogenous shrinkage decreases significantly with an increasing volume of LWAs. Besides, the 14-day autogenous shrinkage reached 77.3%, 74.1%, 69.8%, and 49.2% of the 28-day autogenous shrinkage, suggesting that the autogenous shrinkage of concrete rose dramatically before 14 days and then the development rate became relatively steadily.…”

Section: Influence Of Prewetted Lwas On Shrinkagesupporting

confidence: 55%

Relationship between internal relative humidity and autogenous shrinkage of early‐age concrete containing prewetted lightweight aggregates

Wen

Shen

Feng

et al. 2022

Structural Concrete

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Internal curing (IC) agents such as prewetted lightweight aggregates (LWAs) have been proved to be advantageous in reducing the autogenous shrinkage and early‐age cracking of concrete by introducing additional water. Quantitative analyses of internal relative humidity (IRH) of concrete are essential to better estimate the autogenous shrinkage of early‐age concrete. Existing studies investigate the IRH or autogenous shrinkage of early‐age concrete, respectively; however, the relevance between them of concrete containing prewetted LWAs remain lacking. Accordingly, the IRH, autogenous shrinkage, and the correlation between them for early‐age concrete with various LWAs replacement ratios were investigated. A noncontact device was utilized to measure the IRH and autogenous shrinkage of concrete simultaneously. Test results suggested that: (1) the absolute value of the maximum expansion increased from 0 με to 20, 50, and 96 με when the proportion of prewetted LWAs increased from 0% to 10%, 30%, and 50%, respectively; (2) compared with Mixture LWA00, the autogenous shrinkage at 28 days decreased by 14.7%, 36.3%, and 62.6% for Mixture LWA10, LWA30, and LWA50, respectively; (3) the IRH at 28 days or the critical time of IRH was 88.7%, 90.1%, 93.2%, and 95.9% RH or 5, 6, 8, and 10 days for Mixture LWA00, LWA10, LWA30, and LWA50, respectively; (4) a prediction model for the evaluation of the autogenous shrinkage was constructed based on IRH of early‐age concrete considering the quantity of IC water introduced by various replacement ratios of LWAs.

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“…The total water content is higher for compositions with recycled aggregate and is responsible of a higher cement hydration. Similar observations were already carried out when replacing natural aggregate by lightweight aggregate (Akcay and Tasdemir 2008) or when using super absorbent polymer (Wyrzykowski and Lura 2013).…”

Section: Temperature Evolution In Quasi-adiabatic Conditions and Heatsupporting

confidence: 78%

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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Internal curing of mortars by lightweight aggregates and its effects on hydration

Cited by 18 publications

References 19 publications

An overview on the effect of internal curing on shrinkage of high performance cement-based materials

An overview on the effect of internal curing on shrinkage of high performance cement-based materials

Relationship between internal relative humidity and autogenous shrinkage of early‐age concrete containing prewetted lightweight aggregates

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

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