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Doddy Prayogo
Pág. 21 - 29
Estimating the accurate concrete strength has become a critical issue in civil engineering. The 28-day concrete cylinder test results depict the concrete's characteristic strength which was prepared and cast as part of the concrete work on the project....
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Sanghee Kim, Donghyuk Jung, Ju-Yong Kim and Ju-Hyun Mun
Although accurately estimating the early age compressive strength of concrete is essential for the timely removal of formwork and the advancement of construction processes, it is challenging to estimate it in cool, cold, hot, or unmanaged conditions. Var...
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Samuel Olufemi Folagbade
Pág. 14 - 20
Heat of hydration up to 72 hours and compressive strength up to 7 days of Portland cement and 17 binary and ternary cements containing fly ash, silica fume, and metakaolin, at a water/cement ratio of 0.50 and addition contents of 20%, 35%, and 55%, were ...
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Shuaicheng Guo, Qingli Dai, Xiao Sun, Ye Sun and Zhen Liu
Entrained air voids can improve the freeze-thaw durability of concrete, and also affect its mechanical and transport properties. Therefore, it is important to measure the air void structure and understand its influence on concrete performance for quality...
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Bernard A. Zulu, Shingo Miyazawa and Nobukazu Nito
Accelerated curing is used for mass production in the precast concrete industry. Autogenous shrinkage and drying shrinkage occur in concrete, during and after accelerated curing. Thus, thermal cracks may occur in concrete due to both heating and cement h...
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Daniel Suarez-Riera, Luca Lavagna, Juan Felipe Carvajal, Jean-Marc Tulliani, Devid Falliano and Luciana Restuccia
Biochar, the solid sub-product of biomass pyrolysis, is widely considered an effective water retention material thanks to its porous microstructure and high specific surface area. This study investigates the possibility of improving both mechanical and r...
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Seonguk Hong, Sangki Yoon, Jonghyun Kim, Changjong Lee, Seunghun Kim and Yongtaeg Lee
The purpose of this study is to estimate the compressive strength according to the age of the concrete structure using ultrasonic pulse velocity method. If the correlation between the ultrasonic pulse velocity and the compressive strength according to th...
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Dan Jin, Zejun Lang and Wu Yao
The change of the evaporable water content in the early hydration process of cement paste with different water-to-cement ratios was monitored by low field nuclear magnetic resonance (LF-NMR) relaxometry. The hydration degree and gel/space ratio were acco...
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Chung-Hao Wu, Chung-Ho Huang, Yu-Cheng Kan and Tsong Yen
This study focuses on evaluating the effects of the fineness of fly ash on the strength, fracture toughness, and fracture resistance of concrete. Three fineness levels of fly ash that respectively pass sieves?no. 175, no. 250, and no. 32?were used. In ad...
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Mohammad Sadegh Tale Masoule and Ali Ghahremaninezhad
This study investigates the hydration, microstructure, autogenous shrinkage, electrical resistivity, and mechanical properties of Portland cement pastes modified with PEG-PPG triblock copolymers with varied molecular weights. The early age properties inc...
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Ankit Kothari, Thanyarat Buasiri and Andrzej Cwirzen
This study determined how replacing sodium nitrate-based antifreeze admixture (AF) with belite-calcium sulfoaluminate (belite-CSA) cement affects the early age properties of ecological concretes based on ordinary Portland cement (OPC) and ground granulat...
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Aghiad Alhafez, Shingo Miyazawa, Nobukazu Nito, Ryuichiroh Kuga and Etsuo Sakai
Cement with fly ash has rarely been used in Japan, mainly because its strength development is slower than ordinary Portland cement. In this research, the effect of the new type of fly ash (which was modified by the electrostatic belt separation method) w...
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