The effect of controlled permeable formwork (CPF) liner on the surface quality of concretes

Kothandaraman, S.; Kandasamy, S.

doi:10.1016/j.cemconcomp.2016.11.012

Cited by 18 publications

(2 citation statements)

References 17 publications

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“…e surface of concrete cast with CPF liner had a smooth and darker surface without any visible defects. Figueiras et al [7], Law et al [8,14], Kothandaraman and Kandasamy [10,11], and Liu et al [15] found that surface hardness, water absorption by capillarity, wear resistance, and abrasion resistance of concrete casted with CPF liner was significantly higher than the same concrete cast traditionally. Adam et al [13] and Law et al [14] revealed that CPF liner increased the surface properties of concrete significantly, while the improvement on bulk properties of the concrete, including resistivity, ultrasonic pulse velocity (UPV), and surface hardness, was limited.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mitigative Effect of Controlled Permeable Formwork (CPF) Liner on Early-Age Shrinkage of Box-Girder Concrete

Chen

2019

Advances in Materials Science and Engineering

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Because of its high binder content and severe construction environment, early-age cracking is one of the most important threats to concrete used in continuous box-girder bridge structures. In this study, controlled permeable formwork (CPF) liner was used to mitigate the early-age shrinkage and reduce the early-age cracking risk of box-girder concrete. Early-age shrinkage was measured by a noncontact method and started at 30 min after adding mix water until 7 d. Internal relative moisture content and pore distribution tests were also carried out to reveal the working mechanism of CPF liner. The results show that covering the concrete surface with CPF liner decreased early-age shrinkage significantly. Under the temperature of 20°C and the relative humidity of 60%, two-surface-covering and three-surface-covering CPF liner on concrete decreased the shrinkage by 44% and 48%, respectively, at 7 d compared with concrete without CPF liner covered on it. The main reason is that CPF liner enhanced the internal relative moisture content and resulted in better performance of the surface concrete.

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Section: Introductionmentioning

confidence: 99%

Study on the Mitigative Effect of Controlled Permeable Formwork (CPF) Liner on Early-Age Shrinkage of Box-Girder Concrete

Chen

2019

Advances in Materials Science and Engineering

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“…The SRA mainly reduces the shrinkage of concrete by decreasing the surface tension of the pore solution [ 34 , 35 ], although some studies [ 36 ] have reported that the SRA could also reduce the evaporation rate of water in the concrete. The application of CPFL can drain out air bubbles and water while retaining fine particles like cement, which would lead to a reduced water to binder ratio and the improved structure of the concrete surface [ 22 , 37 , 38 ]. Furthermore, water absorbed by the CPFL would be also released to compensate the RH drop of concrete cover [ 23 ].…”

Section: Resultsmentioning

confidence: 99%

Utilization of Iron Tailings Sand as an Environmentally Friendly Alternative to Natural River Sand in High-Strength Concrete: Shrinkage Characterization and Mitigation Strategies

Zhang

Zhang²,

Yin

et al. 2020

Materials

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The increasing annual emissions of iron ore tailings have proved a great threat to the natural environment, and the shortage of natural river sand, as well as the pursuit of sustainable development materials, provides motivation to reuse iron ore tailings as a fine aggregate in concrete. Due to the significantly different properties of iron tailings sand compared with natural river sand—such as the higher density, higher content of limestone particles smaller than 75 μm and its rough and angular shape—concretes prepared with iron tailings sand show remarkably higher shrinkage. This study presents the shrinkage characterization and shrinkage-reducing efficiency of three different methods on iron tailings, sand concrete and river sand concrete. The internal humidity was also monitored to reveal the shrinkage-reducing mechanism. The obtained results indicated that the autogenous and total shrinkage of iron tailings sand concrete were 9.8% and 13.3% higher than the river sand concrete at the age of 90 d, respectively. The shrinkage reducing agent (SRA) was the most effective shrinkage reducing method for river sand concrete, while for iron tailings sand concrete, super absorbent polymer (SAP) and controlled permeable formwork liner (CPFL) it worked best on autogenous shrinkage and drying shrinkage, respectively. Furthermore, the shrinkage mitigation strategies worked earlier for the drying shrinkage behavior of iron tailings sand concrete, while no such condition could be found for autogenous shrinkage.

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The Impact of Glass Fiber on Controlled Permeable Formwork Self-Compacting Concrete

Kandasamy,

Syed Ibrahim,

Pannirselvam

2023

Lecture Notes in Civil Engineering

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The effect of controlled permeable formwork (CPF) liner on the surface quality of concretes

Cited by 18 publications

References 17 publications

Study on the Mitigative Effect of Controlled Permeable Formwork (CPF) Liner on Early-Age Shrinkage of Box-Girder Concrete

Study on the Mitigative Effect of Controlled Permeable Formwork (CPF) Liner on Early-Age Shrinkage of Box-Girder Concrete

Utilization of Iron Tailings Sand as an Environmentally Friendly Alternative to Natural River Sand in High-Strength Concrete: Shrinkage Characterization and Mitigation Strategies

The Impact of Glass Fiber on Controlled Permeable Formwork Self-Compacting Concrete

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