Tensile response of low clinker UHPFRC subjected to fully restrained shrinkage

Hafiz, Mohamed Abdul; Hajiesmaeili, Amir; Denarié, Emmanuel

doi:10.1016/j.cemconres.2019.105804

Cited by 10 publications

(14 citation statements)

References 39 publications

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“…Because of the very low degree of hydration of Mix I (30% after 28 days [62], 50% of the cement in Mix I could be replaced by two types of inert limestone fillers; Betoflow D® and Betocarb SL® (OMYA). Using the concepts of packing density optimization, the composition of the different components like the cement, limestone fillers and the silica fume was designed.…”

Section: Methodsmentioning

confidence: 99%

“…The new mix, CM22_TKK_b_LF, will be designated as Mix II from here on in the paper. More details on the mix design of the Mix II could be found in [62].…”

Section: Methodsmentioning

confidence: 99%

“…The detailed compositions of Mix I and II are given in Table 1 and the properties in the fresh state are given in Table 2. More details regarding the properties of the mixes in the hardened state, as well as the chemical compositions of the powders in the mixes could be found in [62].…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, this could be also be explained with the microstructure and crisscross effect, along with the development of hydration in Mix II. It was shown in [62] that the development of elastic modulus and hydration at 20°C in Mix II was much slower than that of Mix I, and it took more time for Mix II to reach the final asymptotic Fig. 11.…”

Section: Elastic Limitmentioning

confidence: 99%

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Tensile response of UHPFRC under very low strain rates and low temperatures

Hafiz

Denarié

2020

Cement and Concrete Research

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This paper addresses the uniaxial tensile response of Strain Hardening Ultra High-Performance Fiber Reinforced Concretes (SH-UHPFRC) subjected to very low strain rates and low temperatures. The influence of four different strain rates; 1 × 10 −5 , 1 × 10 −7 , 1 × 10 −8 and 5 × 10 −9 1/s on the tensile properties like elastic limit, elastic modulus, tensile strength and the strain at tensile strength, was studied for two types of SH-UHPFRC mixes; Mix I with type I cement and silica fume, and Mix II with silica fume and 50% mass replacement of type I cement with limestone filler, at three curing temperatures; 20°C, 10°C and 5°C. The tests at strain rates lesser than 1 × 10 −6 1/s are the first of their kind for UHPFRC materials and the results show a considerable impact on the elastic limit of the mixes. Acoustic Emission tests were also carried out for validation of test results of the elastic limit.

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Section: Methodsmentioning

confidence: 99%

“…The new mix, CM22_TKK_b_LF, will be designated as Mix II from here on in the paper. More details on the mix design of the Mix II could be found in [62].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Elastic Limitmentioning

confidence: 99%

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Tensile response of UHPFRC under very low strain rates and low temperatures

Hafiz

Denarié

2020

Cement and Concrete Research

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“…However, only a few notable studies investigated the eigenstresses development in UHPFRC beyond 28 days. Hafiz et al [13] studied the development of eigenstresses in UHPFRC under full restraint conditions and showed that these stresses could reach values higher than the elastic limit and even reach the tensile strain hardening domain of the material after one month at 20°C curing.…”

Section: Introductionmentioning

confidence: 99%

Tensile response of Ultra High Performance PE Fiber Reinforced Concretes (PE-UHPFRC) under imposed shrinkage deformations

2021

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PE-UHPFRC is a new Ultra High-Performance Fiber Reinforced Concrete (UHPFRC), which is developed to reduce the environmental impact of conventional UHPFRC by replacing the steel fibers with synthetic ones and reducing the clinker content in the mix. The development of the dynamic elastic modulus, the evolution of free autogenous deformations and the eigenstresses development with age, under full and partial restraint conditions, were investigated for PE-UHPFRC and the results were put into perspective with that for conventional UHPFRC with steel fibers. Furthermore, the tensile responses of different mixes under imposed shrinkage were compared and discussed. The results showed a shorter setting time and consequently an earlier initiation of elastic modulus development for PE-UHPFRC compared with that of conventional UHPFRC. Furthermore, the developed eigenstresses under full restraint conditions in a PE-UHPFRC layer compared with that for conventional UHPFRC were reduced by more than 70%, which is highly beneficial especially for cast-in-place rehabilitation applications.

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