Influence of internal curing on the pore size distribution of high strength concrete

Kim, Joo Hyung; Choi, Seul Woo; Lee, Kwang Myong; Choi, Young Cheol

doi:10.1016/j.conbuildmat.2018.10.130

Cited by 58 publications

(12 citation statements)

References 28 publications

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“…Pre-wetted recycled coarse aggregate can release water to ensure stable internal relative humidity during moisture transfer between the early concrete and the outside. The internal relative humidity of the control concrete at the later stage is similar to the external environment, making the moisture transfer less efficient [ 39 ], while the internal relative humidity of the concrete incorporated with RAC has a gradient with the external environment leading to a greater rate of change in dry shrinkage at the later stage of RAC.…”

Section: Resultsmentioning

confidence: 99%

Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition

Yang

Guo

et al. 2022

Materials

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Poor mechanical properties and durability of recycled aggregate concrete (RAC) hinder its application in the construction field. In this study, pre-wetted recycled coarse aggregate was used as the internal curing material for prepared RAC with low water-to-binder ratio (W/B), aiming to improve the mechanical properties and durability. The results show that the workability decreases with increasing contents of pre-wetted recycled coarse aggregate. The variation in compressive strength of RAC with different contents of pre-wetted recycled coarse aggregate is obvious within 28 d. After 28 d, the effect of internal curing of pre-wetted recycled coarse aggregate starts to occur, causing a sustained increase in compressive strength. The sealed concrete with 50% and 75% pre-wetted recycled coarse aggregate contents presents the highest compressive strength and better internal curing effect. The pre-wetted recycled coarse aggregate decreases the relative humidity inside the concrete and effectively inhibits the development of shrinkage in the early stages. The RAC with pre-wetted recycled coarse aggregate presents little effect on the drying shrinkage. Additionally, the electric flux of RAC cured for 28 d increases from 561C to 1001C, which presents good resistance to chloride permeation. Microscopic tests indicate that the incorporation of pre-wetted recycled coarse aggregate is beneficial to the improvements of internal structure of RAC.

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Section: Resultsmentioning

confidence: 99%

Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition

Yang

Guo

et al. 2022

Materials

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“…Other researchers also stated that when relative humidity of concrete drops SAP can supply the water in air curing effectively [8]. Other studies shown that LWA could increase the compressive strength with 2-5% only while SAP has increased compressive strength 10-25% in air curing condition [31]. In case of water curing condition reduction in compressive strength observed compared to control SCC at 7 days but it was slightly improved at 28 days as shown in Figure 5.…”

Section: Compressive Strengthmentioning

confidence: 85%

Effect of Super absorbent polymer on workability, strength and durability of Self consolidating concrete

Venkateswarlu

Deo

Murmu

2021

IJE

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This study presents the effect of super absorbent polymer (SAP) as internal curing agent on workability, durability and compressive strength of self-consolidating concrete (SCC). In order to estimate the internal curing efficiency of SAP in different curing conditions and curing ages, compressive strength and electrical resistivity tests have been performed. Homogenous and denser microstructure was formed by gradual release of water from SAP into pores created by SAP. Further pozzolanic reaction of fly ash has enhanced the strength and durability properties. High desorption rate of water from SAP in air curing condition resulted in an increased electrical resistivity and compressive strength. Compressive strength of internal cured SCC mixtures increased to 15-25% at 7 days and 10-19% at 28 days. Electrical resistivity values were increased 11-30% in water curing condition and 16-53% in air curing condition. The costs for 0.35w/b and 0.40 w/b at optimum internal cured SCC mixtures compared to control SCC mixtures were reduced to 9.39 and 9.70%, respectively.

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“…Figure S3 presents the pore size distribution of the RFCBA and NFA. More than 95% percolated pore (28.33% by volume) is greater than 100 nm showing that the RFCBA can be efficiently used for internal curing, as it has been proved the pore with size larger than 100 nm [30][31][32] can supply water effectively during self-desiccation. The absorption and desorption ability of the RFCBA have been reported in the authors' previous work [33].…”

Section: Methodsmentioning

confidence: 99%

Fresh and hardened properties of self-compacting concrete containing recycled fine clay brick aggregates

Zhang

Yuan

et al. 2021

Mater Struct

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Clay brick is one of the major components of demolition waste, which is generally landfilled. Effective and new uses of recycled clay brick may provide sustainability benefits in terms of landfill reduction. Therefore, this research aims at applying Recycled fine clay brick aggregates (RFCBA) with sizes from 0.075 mm-4.75 mm to prepare Self-compacting concrete (SCC). The effects of RFCBA on fresh and hardened properties of SCC were investigated. Saturated surface dry RFCBA was used to replace Natural fine aggregate (NFA) with the percentage of 25%, 50%, 75% and 100%, respectively, in making the SCC mixes. Although experimental results showed that the flowability, passing ability, and segregation resistance of SCC containing RFCBA (RFCBA-SCC) decreased with the increasing RFCBA content, these properties still satisfy the criteria of SCC. The compressive strength, splitting strength, flexural strength, and elastic modulus of the RFCBA-SCC mixes decreased with an increase of RFCBA content. Due to their porous nature, recycled fine clay brick aggregates may also be a source of additional water for internal curing. The internal curing effect was confirmed by the mercury intrusion porosimetry, X-ray diffraction, and thermogravimetric analysis measurements. Moreover, a significant autogenous shrinkage reduction of SCC is achieved by using the RFCBA due to the release of additional water prestored in the RFCBA. Therefore, it can be concluded that the addition of RFCBA to SCC mixtures can provide additional practical benefits in the hardened state.

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Influence of internal curing on the pore size distribution of high strength concrete

Cited by 58 publications

References 28 publications

Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition

Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition

Effect of Super absorbent polymer on workability, strength and durability of Self consolidating concrete

Fresh and hardened properties of self-compacting concrete containing recycled fine clay brick aggregates

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