Delayed Absorption Superabsorbent Polymer for Strength Development in Concrete

Morinaga, Yuka; Akao, Yuya; Fukuda, Daisuke; Elakneswaran, Yogarajah

doi:10.3390/ma15082727

Cited by 7 publications

(12 citation statements)

References 51 publications

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“…Similarly, for wrap and wet curing, the largest percentage difference of −6.4% was observed in CON, followed by −4.1% in SP-0.5, and −3.4% in SP-1.0. The lower difference in SP mortar type indicated the ability of SP to absorb water and to create an internal curing condition in the environment where an external water supply was not available [ 41 , 69 ].…”

Section: Resultsmentioning

confidence: 99%

Use of Cement Mortar Incorporating Superabsorbent Polymer as a Passive Fire-Protective Layer

et al. 2022

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Concrete structures, when exposed to fire or high temperatures for a certain time, could suffer partial damage or complete structural failure. Passive fire-protective coating materials are an alternative way to prevent or delay damage to concrete structures resulting from fire. Superabsorbent polymer (SP) is a synthetic material known for its ability to absorb and retain a large volume of water within itself. With this unique property, the SP exhibits great potential for use as a passive fire protection material. Although several studies have been carried out to investigate the effect of SP as a surface coating material for fire protection, very few have been investigated on the potential use of SP mixed with mortar as a passive fire-protective layer. The objective of this study is to introduce the use of SP in plastering mortar as a fire-protective layer for concrete subjected to temperatures up to 800 °C. This study is divided into two parts: (1) investigating the properties of cement mortar mixed with SP at 0.5% (CONC/SP-0.5) and 1.0% (CONC/SP-1.0) by weight of cement, and (2) investigating the potential use of SP mortar as a plastering layer for concrete subject to high temperatures. The experimental results showed that the density and compressive strength of SP mortar decreases with increasing SP dosages. From the heat exposure results, SP mortar exhibited lower strength loss due to the ability to mitigate moisture through its interconnected pore system. As for the use of SP mortar as a plastering layer, the results demonstrated the concrete specimen plastered with SP mortar had a lower temperature at the interface and core than that plastered with plain mortar. This led to a reduced strength loss of 20.5% for CONC/SP-0.5 and 17.2% for CONC/SP-1.0.

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Section: Resultsmentioning

confidence: 99%

Use of Cement Mortar Incorporating Superabsorbent Polymer as a Passive Fire-Protective Layer

et al. 2022

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“…Laurence et al [ 26 ] conducted a bellows test and a restrained ring test to prove that an SAP can reduce the autogenous shrinkage of a mortar mixture by more than 80% within 7 d, and the shrinkage reduction effect is weakened after 7 d. Yang et al [ 27 ] studied the effect of an SAP on the drying shrinkage and humidity distribution of concrete slabs, proving that the SAP had the best effect of inhibiting shrinkage within 7 d, and the internal curing of the SAP greatly reduced the humidity difference in pavement slabs at different depths. Yuka et al [ 28 ] developed a delayed-absorption SAP, which can reduce autogenous shrinkage without adding additional water and does not affect compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of Super-Absorbent Polymer (SAP) Incorporation Method on Mechanical and Shrinkage Properties of Internally Cured Concrete

Huang¹,

Liu

Rong

et al. 2022

Materials

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To study the effect of SAP incorporation on the early shrinkage of SAP internally cured concrete with the aim to solve the problems of early shrinkage and cracking of bridge leveling-layer concrete, using the SAP incorporation method as a parameter, the mechanical properties test of internally cured concrete, the shrinkage performance test of ring restraint and the scanning electron microscope observation test were carried out. The effects of the SAP content and incorporation method on the flowability, mechanical properties, shrinkage performance and microstructure of internally cured concrete were analyzed. The experimental results show that when the content of the SAP in concrete is 0.2% of the mass of cementitious materials, it has the least influence on the compressive strength of concrete. The addition of preabsorbed water to the SAP can delay early cement hydration, increase the later cement hydration rate and final hydration degree, and improve the concrete strength. Preabsorbed water mixed with an SAP can effectively improve the shrinkage of concrete, and the shrinkage reduction effect is more obvious than that from the dry addition of the SAP; the early cracking risk of concrete without an SAP is high, and it will crack before day 28. The addition of an SAP can strengthen the microstructure of concrete and improve its density and crack resistance, effectively avoiding concrete cracking. It is recommended that the water-absorbent resin be incorporated in a preabsorbent manner, and the SAP preabsorbent ratio is equal to the maximum water storage rate of the SAP.

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“…Subsequently, various measurements were performed on the cured samples. The mix proportions of concrete and its fresh mix characteristics refer to previous studies [ 20 ].…”

Section: Methodsmentioning

confidence: 99%

“…The positive effect is attributed to SAPs acting as internal curing agents, continuously providing a water source that promotes hydration. Consequently, this counteracts the negative impact caused by the internal voids created by SAPs [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…On a dosing basis, whether the SAPs used are pre-saturated or not will also have a direct impact on the plasticity as well as the strength of the cement [ 27 , 28 , 29 , 30 ]. In our previous study, a delayed absorption type of SAPs (I-SAP) was proposed with only minimal changes in rheology while significantly improving the strength of concrete and cement paste [ 20 ]. However, previous studies have not yet investigated the impact of the size of I-SAP on the internal curing capacity of cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Superabsorbent Polymer (SAP) Size on Microstructure and Compressive Strength of Concrete

Niu,

Zhang,

Elakneswaran

et al. 2024

Polymers

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Superabsorbent polymers (SAPs) are hydrophilic, polymeric network materials renowned for their ability to enhance various properties of cementitious materials. This investigation examines the impact of SAP size on the hydration degree, porosity, and compressive strength of cement pastes and concrete under diverse curing conditions and ageing periods. The findings reveal that SAP addition stimulates the hydration of the C2S phase, particularly during the early curing stages, thereby favouring early strength development. However, the effect of SAPs on hydration promotion diminishes as their size increases. Conversely, the size of SAPs affects the hydration range of their action, and the 400 µm SAP demonstrates the most extensive range of hydration enhancement, reaching up to 105 µm. Additionally, SAPs effectively reduce porosity in small pores (4 nm–10 μm), with 200 μm and 400 μm SAPs exhibiting the highest efficacy. While analysing the effects of SAPs on larger pores (>10 μm), the results show that although larger SAPs result in larger average porosity, the total porosity is effectively reduced, particularly in samples incorporating 400 μm SAP. The compressive strength of cement paste, even after 28 days, is slightly reduced following the introduction of SAPs. However, the strength of concrete, due to the naturally occurring pores eliminating the negative effects of the pores produced by SAPs, is significantly increased following the introduction of SAPs, especially 400 µm SAP.

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Delayed Absorption Superabsorbent Polymer for Strength Development in Concrete

Cited by 7 publications

References 51 publications

Use of Cement Mortar Incorporating Superabsorbent Polymer as a Passive Fire-Protective Layer

Use of Cement Mortar Incorporating Superabsorbent Polymer as a Passive Fire-Protective Layer

Effect of Super-Absorbent Polymer (SAP) Incorporation Method on Mechanical and Shrinkage Properties of Internally Cured Concrete

Effect of Superabsorbent Polymer (SAP) Size on Microstructure and Compressive Strength of Concrete

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