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Article

Effect of Formwork Removal Time Reduction on Construction Productivity Improvement by Mix Design of Early Strength Concrete

by
Taegyu Lee
1,†,
Jaehyun Lee
2,†,
Jinsung Kim
3,
Hyeonggil Choi
3,* and
Dong-Eun Lee
3
1
Department of Fire and Disaster Prevention, Semyung University, 65 Semyung-ro, Jecheon-si, Chungbuk 27136, Korea
2
Department of Safety Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea
3
School of Architecture, Civil, Environment, and Energy Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Appl. Sci. 2020, 10(20), 7046; https://doi.org/10.3390/app10207046
Submission received: 4 September 2020 / Revised: 3 October 2020 / Accepted: 6 October 2020 / Published: 11 October 2020
(This article belongs to the Section Materials Science and Engineering)
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Abstract

In this study, we examined the effects of cement fineness, SO3 content, an accelerating agent, and chemical admixtures mixed with unit weights of cement on concrete early strength using concrete mixtures. C24 (characteristic value of concrete, 24 MPa) was used in the experiment conducted. Ordinary Portland cement (OPC), high fineness and SO3 OPC (HFS_OPC), and Early Portland cement (EPC) were selected as the study materials. The unit weights of cement were set to OPC 330, 350, and 380. Further, a concrete mixture was prepared with a triethanolamine (TEA)-based chemical admixture to HFS. A raw material analysis was conducted, and the compressive strength, temperature history, and maturity (D∙h) were examined. Then, the vertical formwork removal time was evaluated according to the criterion of each country. Finally, the time required to develop concrete strength of 5 MPa was estimated. Results showed that the early strength of concrete mixed with HFS and EPC was greater than that exhibited by concrete with an increased unit weight of cement with OPC. In addition, when HFS was used with EPC, its strength developed early, similar to the trend exhibited by EPC, even at low temperatures.
Keywords: early strength of concrete; cement fineness; SO3 content; accelerating agent; maturity; Ordinary Portland cement early strength of concrete; cement fineness; SO3 content; accelerating agent; maturity; Ordinary Portland cement

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MDPI and ACS Style

Lee, T.; Lee, J.; Kim, J.; Choi, H.; Lee, D.-E. Effect of Formwork Removal Time Reduction on Construction Productivity Improvement by Mix Design of Early Strength Concrete. Appl. Sci. 2020, 10, 7046. https://doi.org/10.3390/app10207046

AMA Style

Lee T, Lee J, Kim J, Choi H, Lee D-E. Effect of Formwork Removal Time Reduction on Construction Productivity Improvement by Mix Design of Early Strength Concrete. Applied Sciences. 2020; 10(20):7046. https://doi.org/10.3390/app10207046

Chicago/Turabian Style

Lee, Taegyu, Jaehyun Lee, Jinsung Kim, Hyeonggil Choi, and Dong-Eun Lee. 2020. "Effect of Formwork Removal Time Reduction on Construction Productivity Improvement by Mix Design of Early Strength Concrete" Applied Sciences 10, no. 20: 7046. https://doi.org/10.3390/app10207046

APA Style

Lee, T., Lee, J., Kim, J., Choi, H., & Lee, D.-E. (2020). Effect of Formwork Removal Time Reduction on Construction Productivity Improvement by Mix Design of Early Strength Concrete. Applied Sciences, 10(20), 7046. https://doi.org/10.3390/app10207046

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