Mortars containing wood-based fibres under thermal exposure using cone calorimeter heating

Leena Sarvaranta, Esko Mikkola

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The behaviour of concrete structures under fire can be improved by adding fibers. However, relatively little is known of the details of the possible beneficial features of the fibre addition. The aim of this study was to compare the effects of different wood‐based fibres on the thermal properties of a standard laboratory cement mortar at conditions of a developing fire. The cone calorimeter heating method was used, and the sample thickness and heat flux were varied (25 mm or 50 mm, 25 kWm−2 or 50 kWm−2) to compare test conditions. The fibres comprised chemical pulp, chemi‐thermomechanical pulp, recycled fibres and viscose fibres. The fibre content in the mortar was 0.15–0.5% by weight. Temperature and mass loos measurements of oven‐dried specimens (moisture content <0.1%) showed no differences between different wood‐based fibre mortars and plain mortar. With increasing moisture content (about 5%), however, the presence of fibres affected the release of moisture from the fibre mortar material. With rapid heating of mortars, which have a moisture content of about 5%, local pressures are easily built up. These pressures are mainly caused by free water vaporization. The rear surface temperature measurements indicate that in mortars containing wood‐based fibres (0.15–0.5% by weight) the vaporization temperatures may be 20 –25% lower than in the reference mortar. Some effects on heat transfer can also be observed due to differences in water vaporization and movement processes.
Original languageEnglish
Pages (from-to)35-41
JournalFire and Materials
Volume19
Issue number1
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

Fingerprint

Calorimeters
Mortar
Cones
Wood
Heating
Fibers
Moisture
Vaporization
Fires
Hot Temperature
Chemical pulp
Water
Surface measurement
Concrete construction
Temperature measurement
Pulp
Heat flux
Cements
Thermodynamic properties
Heat transfer

Cite this

@article{a95667e286f840b99e61f8064b01439a,
title = "Mortars containing wood-based fibres under thermal exposure using cone calorimeter heating",
abstract = "The behaviour of concrete structures under fire can be improved by adding fibers. However, relatively little is known of the details of the possible beneficial features of the fibre addition. The aim of this study was to compare the effects of different wood‐based fibres on the thermal properties of a standard laboratory cement mortar at conditions of a developing fire. The cone calorimeter heating method was used, and the sample thickness and heat flux were varied (25 mm or 50 mm, 25 kWm−2 or 50 kWm−2) to compare test conditions. The fibres comprised chemical pulp, chemi‐thermomechanical pulp, recycled fibres and viscose fibres. The fibre content in the mortar was 0.15–0.5{\%} by weight. Temperature and mass loos measurements of oven‐dried specimens (moisture content <0.1{\%}) showed no differences between different wood‐based fibre mortars and plain mortar. With increasing moisture content (about 5{\%}), however, the presence of fibres affected the release of moisture from the fibre mortar material. With rapid heating of mortars, which have a moisture content of about 5{\%}, local pressures are easily built up. These pressures are mainly caused by free water vaporization. The rear surface temperature measurements indicate that in mortars containing wood‐based fibres (0.15–0.5{\%} by weight) the vaporization temperatures may be 20 –25{\%} lower than in the reference mortar. Some effects on heat transfer can also be observed due to differences in water vaporization and movement processes.",
author = "Leena Sarvaranta and Esko Mikkola",
note = "Project code: RTE3512",
year = "1995",
doi = "10.1002/fam.810190106",
language = "English",
volume = "19",
pages = "35--41",
journal = "Fire and Materials",
issn = "0308-0501",
publisher = "Wiley",
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}

Mortars containing wood-based fibres under thermal exposure using cone calorimeter heating. / Sarvaranta, Leena; Mikkola, Esko.

In: Fire and Materials, Vol. 19, No. 1, 1995, p. 35-41.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Mortars containing wood-based fibres under thermal exposure using cone calorimeter heating

AU - Sarvaranta, Leena

AU - Mikkola, Esko

N1 - Project code: RTE3512

PY - 1995

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N2 - The behaviour of concrete structures under fire can be improved by adding fibers. However, relatively little is known of the details of the possible beneficial features of the fibre addition. The aim of this study was to compare the effects of different wood‐based fibres on the thermal properties of a standard laboratory cement mortar at conditions of a developing fire. The cone calorimeter heating method was used, and the sample thickness and heat flux were varied (25 mm or 50 mm, 25 kWm−2 or 50 kWm−2) to compare test conditions. The fibres comprised chemical pulp, chemi‐thermomechanical pulp, recycled fibres and viscose fibres. The fibre content in the mortar was 0.15–0.5% by weight. Temperature and mass loos measurements of oven‐dried specimens (moisture content <0.1%) showed no differences between different wood‐based fibre mortars and plain mortar. With increasing moisture content (about 5%), however, the presence of fibres affected the release of moisture from the fibre mortar material. With rapid heating of mortars, which have a moisture content of about 5%, local pressures are easily built up. These pressures are mainly caused by free water vaporization. The rear surface temperature measurements indicate that in mortars containing wood‐based fibres (0.15–0.5% by weight) the vaporization temperatures may be 20 –25% lower than in the reference mortar. Some effects on heat transfer can also be observed due to differences in water vaporization and movement processes.

AB - The behaviour of concrete structures under fire can be improved by adding fibers. However, relatively little is known of the details of the possible beneficial features of the fibre addition. The aim of this study was to compare the effects of different wood‐based fibres on the thermal properties of a standard laboratory cement mortar at conditions of a developing fire. The cone calorimeter heating method was used, and the sample thickness and heat flux were varied (25 mm or 50 mm, 25 kWm−2 or 50 kWm−2) to compare test conditions. The fibres comprised chemical pulp, chemi‐thermomechanical pulp, recycled fibres and viscose fibres. The fibre content in the mortar was 0.15–0.5% by weight. Temperature and mass loos measurements of oven‐dried specimens (moisture content <0.1%) showed no differences between different wood‐based fibre mortars and plain mortar. With increasing moisture content (about 5%), however, the presence of fibres affected the release of moisture from the fibre mortar material. With rapid heating of mortars, which have a moisture content of about 5%, local pressures are easily built up. These pressures are mainly caused by free water vaporization. The rear surface temperature measurements indicate that in mortars containing wood‐based fibres (0.15–0.5% by weight) the vaporization temperatures may be 20 –25% lower than in the reference mortar. Some effects on heat transfer can also be observed due to differences in water vaporization and movement processes.

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