Effects of low temperature on the static behaviour of reinforced concrete beams with temperature differentials

Mirzazadeh, M. Mehdi; Noël, Martin; Green, Mark F.

doi:10.1016/j.conbuildmat.2016.02.216

Cited by 23 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Temperature variation may induce excessive tensile stress in concrete to cause cracks on surface and throughout cross-section. Mirzazadeh et al (2016) conducted a study on the response of reinforced concrete at different temperature environments. It was found that low temperature delayed the crack propagation of reinforced concrete at a given load showing a correlation of cracks with temperature differential.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties and residual strength after high temperature exposure of cement mortar using ferronickel slag aggregate

Saha

Sarker

Golovanevskiy

2019

Construction and Building Materials

View full text Add to dashboard Cite

This study evaluates the thermal properties of cement mortar using by-product ferronickel slag (FNS) fine aggregate and its residual strength after high temperature exposure. Compressive strength of mortar increased when FNS was used up to 50% replacement of sand and then reduced with further increase of FNS. Volume of permeable voids (VPV) increased by 4% and 7% respectively for using 50% and 100% FNS fine aggregate. Thermal conductivity of mortar decreased from 2.34 W/m.K for using 100% sand to 1.65 W/m.K and 1.16 W/m.K for 50% and 100% FNS, respectively. Similarly, specific heat increased from 2.18 MJ/m 3 .K to 2.43 MJ/m 3 .K for 100% replacement of sand by FNS. These changes of VPV and thermal properties are attributed to the cavity of FNS particles, and their larger size and angular shape. Residual strengths of mortar after exposure to 800 o C were found marginally less for using FNS aggregate. This is attributed to the decrease of thermal conductivity of mortar by FNS. Overall, FNS aggregate showed improved thermal insulating properties and thermal mass of mortar without compromising compressive strength. Therefore, FNS can be considered for use as an energy efficient sustainable building material.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal properties and residual strength after high temperature exposure of cement mortar using ferronickel slag aggregate

Saha

Sarker

Golovanevskiy

2019

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…SF was two-way hooks with length of 30-50 mm. Since SF can remain functional even at high temperature of 1200 °C, the incorporation of these fibers can enhance the resistance of concrete in fire condition as well as the mechanical properties [18,40]. The GF used in the present work was of type "High Silica" with length of 12 mm.…”

Section: 4 Fibersmentioning

confidence: 99%

Elevated Temperature Performance of Concrete Reinforced with Steel, Glass, and Polypropylene Fibers and Fire-proofed with Coating

2022

IJE

View full text Add to dashboard Cite

Concrete has good strength and durability; however, it suffers from spalling and significant reduction of strength when exposed to fire. This study was aimed to enhance the fire resistance of concrete by applying two different techniques: 1) reinforcing with fiber, and 2) applying a fire-proof coating. For this purpose, mixes were made with steel fiber (SF), glass fiber (GF), and polypropylene fiber (PPF) applied at 0.5-2% of cement weight; in addition to a mix prepared with a 15 mm layer of fireproof coating material and a control mix. All mixes were subjected to elevated temperatures of 200-800 °C, and physical and mechanical properties were evaluated. According to the test results, both techniques were effective in enhancing the fire resistance of concrete mixes. The maximum residual compressive and flexural strengths were obtained for mix containing 0.5% GF, which were 117% and 145% higher than that of the control mix at 800 °C, respectively. Also, concrete with fireproof coating showed up to 76% and 113% higher compressive and flexural strengths compared to that of the control mix, respectively. It was found that addition of fibers in the manufacturing process of the concrete is a more desirable and economically-efficient approach to enhance the fire resistance. However, for an existing concrete structure, applying fireproof coating is the only option and can enhance the fire resistance comparably.

show abstract

“…However, the low temperatures studied by Dalen [1] were limited to -10 and -20 ℃ which were still much higher than the severest low temperatures in cold regions. Low-temperature structural studies of reinforced concrete (RC) members have been reported on bridge columns [18][19][20][21], RC beams [22,23], FRP reinforced RC beams [24][25][26], and FRP confined RC columns [27,28]. These studies focused on the evaluation and retrofitting of aged cold-region infrastructures in Canada.…”

Section: Introductionmentioning

confidence: 99%

Behaviours of Steel-Concrete Composite Beams at Low Temperatures: Materials and Structures

2023

View full text Add to dashboard Cite

This paper reported the low-temperature ultimate strength behaviours of steel-concrete composite beams (SCCBs) from material to structure levels. Firstly, low-temperature mechanical properties of constructional materials in SCCBs, e.g., concrete, headed studs, and mild steel plate for I-beams, were experimentally studied. The studies on constructional materials showed that decreasing the temperature (T) from 20 to -80 ℃, the strength and ductility of headed studs and I-beam were generally increased; the decreasing T increased the strength, but reduced the ductility of concrete. Followed, the shear and tensile behaviours of headed studs in concrete at different T levels of 20~-80 ℃ were experimentally investigated. Test results showed that decreasing T from 20 to -80 ℃ increased the shear and tensile resistance of headed studs, but showed different effects on ductility. Four-point bending tests on three SCCBs were performed at T of 20, -30 and -60℃ to investigate the low-temperature ultimate strength behaviours. These tests showed that at low temperatures all SCCBs failed in flexure with crushing of top concrete slab and yielding of bottom I-beam. Decreasing T from 20 to -30 and -60℃ increased the ultimate strength of SCCBs by 10% and 24%, respectively. A series of prediction equations were proposed to incorporate the effects of the decreasing T on compressive and tensile strength of concrete, shear and tensile capacity of studs, and ultimate bending resistance of SCCBs. Their accuracies have been validated by these material and member tests.

show abstract

Effects of low temperature on the static behaviour of reinforced concrete beams with temperature differentials

Cited by 23 publications

References 10 publications

Thermal properties and residual strength after high temperature exposure of cement mortar using ferronickel slag aggregate

Thermal properties and residual strength after high temperature exposure of cement mortar using ferronickel slag aggregate

Elevated Temperature Performance of Concrete Reinforced with Steel, Glass, and Polypropylene Fibers and Fire-proofed with Coating

Behaviours of Steel-Concrete Composite Beams at Low Temperatures: Materials and Structures

Contact Info

Product

Resources

About