Compressive strength for service and accident conditions

Schneider, Ulrich; Schwesinger, P.; Debicki, G.; Diederichs, Ulrich; Franssen, Jean‐Marc; Jumpannen, Ula Maija; Khoury, G. A.; Millard, Alain; Morris, W. A.; Furumu, F.

doi:10.1007/bf02473077

Cited by 73 publications

(5 citation statements)

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“…At 90 days, all specimens for mechanical performance testing and permeability were heated in an electric furnace to T = 200, 400, 600, 800, and 1000 °C. As recommended by RILEM [16], a heating rate of 0.5 °C/min was applied. A slow heating rate is applied for concrete mechanical behavior testing at high temperatures in order to ensure limitation of the thermal gradient inside the specimen.…”

Section: Materials Specimen Preparation Curing and Heatingmentioning

confidence: 99%

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Effect of Cement Type on the Mechanical Behavior and Permeability of Concrete Subjected to High Temperatures

et al. 2019

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The paper presents experimental investigations concerning the influence of the cement type (CEMI 42.5 R Portland cement and CEMIII/A 42.5 N slag cement—with 53% granulated blast furnace slag) on the mechanical and transport properties of heated concretes. The evolution of properties due to high temperature exposure occurring during a fire was investigated. High temperature exposure produces changes in the transport and mechanical properties of concrete, but the effect of cement type has not been widely studied in the literature. In this paper, concretes were made with two cement types: CEMI and CEMIII, using basalt (B) and riverbed aggregates (RB). The compressive and tensile strength, as well as the static modulus of elasticity and Cembureau permeability, were tested after high temperature exposure to 200, 400, 600, 800, and 1000 °C. The evaluation of damage to the concrete and crack development due to high temperature effects was performed on the basis of the change in the static modulus of elasticity. The test results clearly demonstrated that permeability increases with damage, and it follows an exponential type formula for both types of cement.

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Section: Materials Specimen Preparation Curing and Heatingmentioning

confidence: 99%

“…In the literature investigations the heating rates of 0.1–10 °C/min are employed. Nevertheless, the heating rates recommended by RILEM International Union of Laboratories and Experts in Construction Materials, Systems and Structures [16] depend on the specimen diameter and are from 0.5 to 2.0 °C/min for accidental conditions (fires).…”

Section: Introductionmentioning

confidence: 99%

Effect of Cement Type on the Mechanical Behavior and Permeability of Concrete Subjected to High Temperatures

et al. 2019

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“…Further curing and storage occurred in a storage chamber with an air temperature of 20 ± 2 • C and relative humidity (RH) of 50 ± 5% until the beginning of testing in a hardened state. The total curing time was around 140 days, respecting the conditions that RILEM recommends: specimens should be older than 90 days [42].…”

Section: Testing Of Fresh Concretementioning

confidence: 90%

“…Bamigboye et al [40] obtained similar result; they varied the percentages of coconut fibers from 0-1% and they found that the increase in fiber content beyond 0.5% decreased the workability of the concrete. The mixtures were cast into cylinders with a height equal to three times the diameter (225 mm/75 mm) in accordance with RILEM requirements, the maximum aggregate size, and previous studies [41][42][43]. After the specimens were demolded for the first 24 h, they were placed in a water tank for 6 days.…”

Section: Testing Of Fresh Concretementioning

confidence: 99%

“…The specimens were prepared for testing according to the recommendations [42]: the ends of the specimen should be nominally parallel, flat, and orthogonal to its central axis. Five series of specimens were prepared for each concrete mixture, for a total of 60 cylinders.…”

Section: Heating and Cooling Regime Of The Concrete Test Specimens: Testing Of Hardened Concrete Specimensmentioning

confidence: 99%

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Post-Fire Mechanical Properties of Concrete Reinforced with Spanish Broom Fibers

Juradin

Vranješ²,

Jozić

et al. 2021

J. Compos. Sci.

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In this study, we conducted an initial investigation of the post-fire mechanical properties of concrete reinforced with Spanish broom fibers. The mechanical properties were determined at room temperature, and the post-fire mechanical properties were determined at elevated temperature, so that the fire resistance of the concrete could be determined. Five mixtures were considered: three with differently treated Spanish broom fibers, a polypropylene fiber mixture, and a reference concrete mixture. The concrete and reinforced concrete samples were first dried to 100 °C, then heated to 400 °C, and left to cool to room temperature. The samples were tested immediately and 96 h after cooling. The compressive strength, weight loss, ultrasonic pulse velocity, and dynamic modulus of elasticity were determined and compared. The cross-sectional images of the concrete samples captured through an optical microscope were observed and analyzed. The changes in fiber structure were monitored by TG/DTG analysis. The results of the study indicate that even the reference concrete mixture did not have satisfactory residual properties. The reinforced concretes did not improve the residual properties of the reference concrete, but reduced the spalling and explosive failure performance under a compressive load. The concrete reinforced with Spanish broom fibers showed improved residual properties compared with concrete reinforced with polypropylene fibers.

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