Effects of Shrinkage Reducing Agent and Expansive Additive on Mortar Properties

Treesuwan, Sarapon; Maleesee, Komsan

doi:10.1155/2017/8917957

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…e data is comparable to the previous studies. For example, research by Xie et al [23] showed that, with 2% SRA addition, 65.6% reduction in autogenous shrinkage can be achieved compared to the reference plain UHPC at 7 d. Similarly, Su et al [25] reported an up to 95% reduction in autogenous shrinkage with 2% SRA dosage at 7 d.…”

Section: Autogenous Shrinkage Of Uhpcmentioning

confidence: 99%

Mechanical Performance and Microstructure of Ultra‐High‐Performance Concrete Modified by Calcium Sulfoaluminate Cement

Song

Wang

Cui

et al. 2021

Advances in Civil Engineering

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High autogenous shrinkage property is one of the disadvantages of ultra-high-performance concrete (UHPC), which may induce early age cracking and threaten the safety of concrete structure. In the present study, different dosages of calcium sulfoaluminate (CSA) cement were added in UHPC as an effective expansive binder. Hydration mechanism, autogenous shrinkage property, and compressive strength of UHPC were carried out to investigate the effect of CSA addition on the mechanical properties of UHPC. Scanning electron microscopy was also employed to characterize the intrinsic microstructural reasons relating to the changes in macroproperties. Based on the XRD diagram, increasing formation of ettringite and Ca(OH)2 can be found with increasing CSA content up to 15%. In the heat flow results of UHPC with 10% CSA addition, the maximum heat release increases to 2.6 mW/g, which is 8.3% higher than the reference UHPC, suggesting a higher degree of hydration with CSA addition. The results in autogenous shrinkage show that CSA expansion agent plays a significantly beneficial role in improving the autogenous shrinkage of UHPC. The corresponding autogenous shrinkage of UHPC is −59.66 μ ε , −131.11 μ ε , and −182.31 μ ε , respectively, at 7 d with 5%, 10%, and 15% addition, which is 108%, 117%, and 123% reduction compared to the reference specimen without CSA. In terms of compressive strength, UHPC with 5%, 10%, 15%, and 20% CSA addition has 10.5%, 17.4%, 30.2%, and 22.1% higher compressive strength than that for the reference UHPC at 28 d. Microstructural study shows that there is an extremely dense microstructure in both the bulk matrix and interfacial transition zone of UHPC with 10% CSA addition, which can be attributed to the higher autogenous shrinkage property and can therefore result in higher mechanical performance.

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Section: Autogenous Shrinkage Of Uhpcmentioning

confidence: 99%

Mechanical Performance and Microstructure of Ultra‐High‐Performance Concrete Modified by Calcium Sulfoaluminate Cement

Song

Wang

Cui

et al. 2021

Advances in Civil Engineering

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“…Thus, the steam curing which helps improve the compressive strength has been used in this experiment. [6,7] Studies on the shrinkage and expansion property from using the 3 materials and its impacts are rare. Hence, further thorough studies concerning the expansion property from the use of local materials are considerably necessary.…”

Section: Introductionmentioning

confidence: 99%

Effect of Expansive Additive and Shrinkage Reducing Agent on Plastic Shrinkage of Steam-Cured Mortar

Treesuwan¹,

Maleesee²,

Date

2018

MSF

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This research is part of the mortar’s plastic shrinkage study. Contents in this article is related to how the Expansive Additive (EX), Shrinkage Reducing Agent (SRA), and Fly Ash (FA) help to reduce and control the shrinkage and to compare the effectiveness of these substances used in the normal curing, i.e., at 30 °C and in the steam curing process by using the factorial design with 3 factors and to be divided into 2 levels. Factors to be studied are the amount of EX, SRA and FA replacement. The test of plastic shrinkage was conducted in accordance with the ASTM C1579-06 standard, placing the strain gauge 0.5 centimeters beneath the surface in the middle of the mold, recording the shrinkage rate starting from the initial setting time for 24 hours. The results showed that, in normal curing, the EX influences the expansion while, in steam curing, the EX and SRA significantly influences the expansion. To add the FA in high volume along with the EX significantly effects the expansion for both the normal and steam curing. Furthermore, the study model and equation for plastic shrinkage of mortar are presented in the form of factor proportion to be considered from the factorial design study basis.

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