TY - JOUR
T1 - Optimized mix design for 180 MPa ultra-high-strength concrete
AU - Shin, Hyun Oh
AU - Yoo, Doo Yeol
AU - Lee, Joo Ha
AU - Lee, Seung Hoon
AU - Yoon, Young Soo
N1 - Funding Information:
This research was supported by a grant (19CTAP-C152012-01) from Technology Advancement Research Program(TARP) funded by Ministry of Land, Infrastructure and Transport of Korean government and also supported by research fund of Chungnam National University .
Publisher Copyright:
© 2019 The Authors.
PY - 2019/9
Y1 - 2019/9
N2 - This study aims to optimize the proportion and constituents of the mixture used for fabricating 180 MPa ultra-high-strength concrete (UHSC) including coarse aggregate. Various parameters, such as the supplementary cementitious material (SCM) type and amount, water-binder (W/B) ratio, fine and coarse aggregate type and amount, chemical admixture, and mixing process, were considered and their effect on the compressive strength was examined. Based on several experimental tests, the optimized SCM proportions for cement, silica fume (SF), ground-granulated blast furnace slag (BFS), and gypsum are 55%, 20%, 20%, and 5%, respectively. The most appropriate W/B ratio, unit water content, and sand-total aggregate (S/a) ratio are 12.5%, 150 kg/m3, and 0.35, respectively. The use of very fine SF with a specific surface area of 13.7 m2/g and diorite, which is a type of coarse aggregate, improves the compressive strength of UHSC. The optimum amount of superplasticizer ranges between 1.3% and 1.6% and the most suitable slump flow is 750 mm. Finally, for this type of flowable UHSC, a mixing time and speed of 5 min and 40 rpm, respectively, and natural self-compacting without using a tamping bar are recommended. Based on the optimized mix design, UHSC with a compressive strength of 180 MPa can be certainly fabricated.
AB - This study aims to optimize the proportion and constituents of the mixture used for fabricating 180 MPa ultra-high-strength concrete (UHSC) including coarse aggregate. Various parameters, such as the supplementary cementitious material (SCM) type and amount, water-binder (W/B) ratio, fine and coarse aggregate type and amount, chemical admixture, and mixing process, were considered and their effect on the compressive strength was examined. Based on several experimental tests, the optimized SCM proportions for cement, silica fume (SF), ground-granulated blast furnace slag (BFS), and gypsum are 55%, 20%, 20%, and 5%, respectively. The most appropriate W/B ratio, unit water content, and sand-total aggregate (S/a) ratio are 12.5%, 150 kg/m3, and 0.35, respectively. The use of very fine SF with a specific surface area of 13.7 m2/g and diorite, which is a type of coarse aggregate, improves the compressive strength of UHSC. The optimum amount of superplasticizer ranges between 1.3% and 1.6% and the most suitable slump flow is 750 mm. Finally, for this type of flowable UHSC, a mixing time and speed of 5 min and 40 rpm, respectively, and natural self-compacting without using a tamping bar are recommended. Based on the optimized mix design, UHSC with a compressive strength of 180 MPa can be certainly fabricated.
KW - Compressive strength
KW - Optimum mix design
KW - Self-compaction
KW - Supplementary cementitious materials
KW - Ultra-high-strength concrete
UR - http://www.scopus.com/inward/record.url?scp=85071944119&partnerID=8YFLogxK
U2 - 10.1016/j.jmrt.2019.07.027
DO - 10.1016/j.jmrt.2019.07.027
M3 - Article
AN - SCOPUS:85071944119
SN - 2238-7854
VL - 8
SP - 4182
EP - 4197
JO - Journal of Materials Research and Technology
JF - Journal of Materials Research and Technology
IS - 5
ER -