Effect of thermal shock due to rapid cooling on residual mechanical properties of fiber concrete exposed to high temperatures

Peng, Gai Fei; Bian, Song-Hua; Guo, Zhang; Zhao, Jie; Peng, Xin-Lai; Jiang, Yu-Chuang

doi:10.1016/j.conbuildmat.2006.12.002

Cited by 140 publications

(76 citation statements)

References 16 publications

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“…David, et al, 1999;Lion et al, 2005;Reuschlé, et al, 2006), with values in excess of 2°C min −1 deemed to facilitate thermal shock (see Hall, 1999 andAndré, 2003 for a discussion). Values recently used to create thermal shock range from 2.4°C min −1 (Ferrero and Marini, 2001), through 10°to 15°C min −1 (Ghaffarian, 2001), to 25°to 44°C min −1 (Peng et al, 2008). Although, theoretically, the boundary values for the thermal shock of any specific material may be calculated (e.g.…”

Section: Discussionmentioning

confidence: 98%

The historical legacy of spatial scales in freeze–thaw weathering: Misrepresentation and resulting misdirection

Hall

Thorn

2011

Geomorphology

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Section: Discussionmentioning

confidence: 98%

The historical legacy of spatial scales in freeze–thaw weathering: Misrepresentation and resulting misdirection

Hall

Thorn

2011

Geomorphology

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“…In recent years different concrete specimens, including high-strength concrete [2,5,[15][16][17], fiber-reinforced concrete [9,[18][19][20], lightweight aggregate concrete [13,21] were used in high-temperature tests. In the high-strength concrete studies explosive spalling was the main problem.…”

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confidence: 99%

Effect of elevated temperatures and cooling regimes on normal strength concrete

2008

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SUMMARYThe compressive strength of normal strength concrete at elevated temperatures up to 700 • C and the effect of cooling regimes were investigated and compared in this study. Thus, two different mixture groups with initial strengths of 20 and 35 MPa were produced by using river sand, normal aggregate and portland cement. Thirteen different temperature values were chosen from 50 to 700 • C. The specimens were heated for 3 h at each temperature. After heating, concretes were cooled to room temperature either in water rapidly or in laboratory conditions gradually. The residual strengths were determined by an axial compressive strength test. Strength and unit weight losses were compared with the initial values. Throughout this study, ASTM and Turkish Standards were used. It was observed that concrete properties deteriorated with the heat; however, a small increase in strength was observed from 50 to 100 • C. Strength loss was more significant on the specimens rapidly cooled in water. Both concrete mixtures lost a significant part of their initial strength when the temperature reached 700 • C.

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“…It seems likely that this behaviour is due to the large temperature variation between the outer and inner surfaces of modern clay brick units, associated with a faster heating rate. These factors combined to produce a higher internal pressure exceeding the tensile strength of the brick sample [33][34][35]. A colour change from white to pink was also observed for all tested samples at elevated temperatures.…”

Section: -6 Density At High Temperaturesmentioning

confidence: 84%

Characterization of the clay masonry units and construction technique at the ancient city of Nippur

Al-Sibahy

Edwards

2017

Engineering Structures

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This paper describes a programme of experimental measurements performed in support of a parallel programme of field investigations to evaluate the construction methods used at the site of the ancient city of Nippur. The experimental programme investigated both the mechanical properties and durability of the ancient clay masonry units used in the construction of buildings at Nippur including tests for dimensional consistency and flatness, density, compressive strength, initial rate of water absorption and thermal properties. The test results have been compared with those for modern brick units available nowadays in Iraq and with hard natural stone samples.The field investigations showed that the important buildings were constructed using composite walls inclusion firing clay masonry units with two nominal dimensions (30× 30×7) cm and (30× 15× 7) cm (l, w and h). The formulation of working design technique was followed to achieve the member stability under applied loads. Layers of bitumen material were used as a binder for both bed and head joints in order to provide the desired strength level for the masonry wall. The experimental results show that the ancient brick units and stone samples exceed the tolerance and range of dimensions limits recommended by current EN Standards. Lower density values were recorded for the ancient brick units compared with that for both modern clay brick and stone specimens and these values showed agreement with the modern classification of high density (HD) units. Approximately similar values of compressive strength were observed for both ancient brick units and natural stone samples reaching about 17 MPa, whilst modern clay brick samples showed lower compressive strength value suitable for application of partition walls. The initial rate of water absorption increases with an increase of the soaking time, but tends to decrease after 90 minutes for both ancient and modern brick units. Superior performance in terms of thermal conductivity, thermal resistance and durability under fire action were observed for the ancient brick samples compared with modern clay brick and stone samples.

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Effect of thermal shock due to rapid cooling on residual mechanical properties of fiber concrete exposed to high temperatures

Cited by 140 publications

References 16 publications

The historical legacy of spatial scales in freeze–thaw weathering: Misrepresentation and resulting misdirection

The historical legacy of spatial scales in freeze–thaw weathering: Misrepresentation and resulting misdirection

Effect of elevated temperatures and cooling regimes on normal strength concrete

Characterization of the clay masonry units and construction technique at the ancient city of Nippur

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