scholarly journals Early age strain behavior and tensile softening properties of High Performance Fiber Reinforced Mortar with a strength class around 100 N/mm2

2016 ◽  
Vol 27 (0) ◽  
pp. 33-42
Author(s):  
Ryosuke Shionaga ◽  
Yasuhiko Sato
Keyword(s):  
High Performance ◽  
Strength Class ◽  
Early Age ◽  
Fiber Reinforced ◽  
Strain Behavior ◽  
High Performance Fiber ◽  
Tensile Softening

scholarly journals Autogenous Self-Healing Capacity of Early-Age Ultra-High-Performance Fiber-Reinforced Concrete

2021 ◽  
Vol 13 (6) ◽  
pp. 3061
Author(s):  
Estefania Cuenca ◽  
Pedro Serna
Keyword(s):  
Crack Closure ◽  
High Performance ◽  
Tap Water ◽  
Early Age ◽  
Self Healing ◽  
Fiber Reinforced ◽  
High Performance Fiber ◽  
Humidity Chamber ◽  
Crack Widths ◽  
Exposure Conditions

This paper analyzes the autogenous self-healing capacity of early-age Ultra-High-Performance Fiber-Reinforced concretes (UHPFRCs) by measuring the crack closure and the possible mechanical recovery on healed specimens. The main parameters considered in this research were the healing exposure conditions (humidity chamber, immersion in tap water, immersion in seawater and heat curing) and the precracking levels (microcracks and macrocracks). For the microcrack level, four-point bending tests were performed on prismatic specimens (100 × 100 × 500 mm3) obtaining a multiple cracking pattern characterized by crack widths ranged from 10 to 20 µm. Whereas for the macrocrack level (behavior after crack localization), splitting tests were carried out on notched cubic specimens (100 × 100 × 100 mm3) obtaining crack widths of up to 0.4 mm. For both precracking levels, specimens were precracked at two days and were cured for one month in the mentioned exposure conditions. Healing products were analyzed on the specimen surface and also inside the cracks; to this purpose, their microstructure was analyzed by means of SEM and EDS analyses. The results have shown that the highest crack closure values were obtained for the heat-cured specimens and for the specimens immersed in water (tap water and seawater) whereas the less efficient condition was the humidity chamber.

scholarly journals Effect of Curing Conditions on the Shrinkage of Ultra High-Performance Fiber-Reinforced Concrete

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Song Han ◽  
Yefu Cui ◽  
Hanfeng Huang ◽  
Mingzhe An ◽  
Ziruo Yu
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Bound Water ◽  
Fiber Reinforced Concrete ◽  
Curing Temperature ◽  
Early Age ◽  
Fiber Reinforced ◽  
Curing Conditions ◽  
High Performance Fiber

The effect of curing conditions on the early age and long-term shrinkage of ultra high-performance fiber-reinforced concrete (UHPFRC) was systematically studied. The shrinkage of the early age (0–168 h) and long-term age (0–90 d) of UHPFRC material was measured based on three kinds of humidity conditions (dry, sealed, and soaked) and curing temperatures (25°C, 40°C, and 75°C), respectively. In this paper, the hydration degree of different shrinkage stages was studied in combination with chemical-bound water experiment. Meanwhile, the influencing mechanism of curing condition on the shrinkage of UHPFRC was analyzed. The results show that the early shrinkage rate of UHPFRC is accelerated with the increase of temperature, and the rate of shrinkage development at the latter stage is suppressed with the increase of temperature. With the increase of humidity, the early age shrinkage of UHPFRC and its increasing rate gradually decrease, which means drying condition > sealing condition > soaking condition. According to the long-term shrinkage results, increasing temperature has very significant inhibiting effect on the UHPFRC shrinkage in the sealed condition. Due to the majority of the in-site components of UHPFRC cured in the sealed condition, high-temperature curing has evident inhibition of early age shrinkage of UHPFRC. Therefore, promoting curing temperature is fairly effective at inhibiting the early age shrinkage of UHPFRC for the in-site structures.

Influence of technological factors on the properties of ultra-high-performance fiber reinforced concrete

2020 ◽  
pp. 135-147
Author(s):  
Igor Chilin ◽  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Technological Factors ◽  
High Performance Fiber

Приведены результаты исследований и выполнена оценка влияния технологических факторов на реологические свойства самоуплотняющихся сталефибробетонных смесей, определены кратковременные и длительные физико-механические и деформативные характеристики сверхвысокопрочного сталефибробетона, включая определение его фактической морозостойкости.

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