چکیده مقاله
The production of cement significantly contributes to global CO₂ emissions Therefore, it is essential to identify alternative supplementary cementitious materials SCMs , such as fly ash, micro silica, and slag, that enhance concrete performance while reducing environmental impact Among these, micro silica MS is considered one of the most effective SCMs It is an ultrafine amorphous silica produced as a byproduct of electric arc furnace processes during the production of silicon or ferrosilicon alloys Due to its high pozzolanic reactivity and microfiller effect, MS contributes to matrix densification and reduced porosity, thereby enhancing the strength and durability of concrete This study investigated the effect of MS on the mechanical behavior of ultra high strength concrete UHSC Basalt aggregates are suitable for use due to their high strength, low reactivity, and excellent durability For this purpose, based on both technical and economic considerations, a 65: 35 coarse and fine aggregate mixture was selected To this end, 24 cubic specimens 100 mm were prepared using four mix designs containing 0 control scheme , 5, 10, and 15% MS by weight of cement All mixes had a constant water to cement ratio W/C of 0 0 2 and identical basalt aggregate grading Compressive strength tests were conducted at curing ages of 7, 14, and 28 days Specimens were prepared under standardized conditions and cured in a saturated lime water tank at a controlled temperature of 23 ± 1 °C until testing The present study's findings showed that the highest compressive strength, recorded at 133 MPa, was achieved at 28 days for the specimen containing 15% MS, representing a 25% increase compared to the control scheme The observed increase in compressive strength is attributed to the pozzolanic reactions of MS, which reduce total porosity, limit pore connectivity, and promote matrix densification in the concrete microstructure
کلیدواژهها
نویسندگان
امیرحسین آرمان
B Sc , Department of Civil Engineering, Urmia University of Technology UUT , Iran
Ayda Kazemi motlagh
B Sc Student, Department of Civil Engineering, UUT, Iran
Erfan Shafei
Associate Professor, Department of Civil Engineering, UUT Urmia, Iran
Ehsan Kuse sedan
M Sc Student, Department of Structural Engineering, Amirkabir University of Technology, Tehran, Iran
Tadeh Zirakian*
Associate Professor, Department of Civil Engineering and Construction Management, California State University, Northridge, USA
Mohammad reza Saei
Instructor, Concrete Lab, Department of Civil Engineering, UUT, Iran
شیوه ارجاع
Arman, Amirhossein and Kazemi motlagh, Ayda and Shafei, Erfan and Kuse sedan, Ehsan and Zirakian*, Tadeh and Saei, Mohammad reza,1404,Exploring microsilica’s role in ultra-high-strength concrete: An experimental study,Third International Conference on applied researches in civil engineering, architecture and urban planning
ارائهشده در
مجموعه مقالات سومین کنفرانس بین المللی پژوهش های کاربردی در مهندسی عمران، معماری و شهرسازی30 آبان 1404