摘要:

AbstractComparison of oxygen and nitrous oxide indices indicates that ammonium polyphosphate (APP) should act in the condensed phase when added to nylon 6 (PA‐6). A detailed study of the thermal degradation mechanism of PA‐6/APP mixtures is carried out. A polyphosphate ester is formed on heating, which is the precursor of an intumescent char. Evidence is given of the thermal insulating action of the intumescent char which slows down the rate of combustion of the poly

ISSN:0308-0501    

DOI:10.1002/fam.810190102

出版商:John Wiley&Sons Ltd.    

年代:1995

数据来源: WILEY

摘要:

AbstractA linear hereditary integral technique provides simple analytic solutions for deconvoluting thermopile and oxygen consumption data to remove the effect of instrument response time on peak and integrated heat release rate values. A comparison of corrected and uncorrected thermopile and oxygen sensor data obtained on an Ohio State University (OSU) apparatus for various materials indicates that significant errors in peak and integrated heat release rate can result from delayed instrument response to repidly changing heat flows. However, correcting for temporal effects alone using this procedure does not account for differences between heat release rate values obtained by thermopile and oxygen consumption methods.

ISSN:0308-0501    

DOI:10.1002/fam.810190103

出版商:John Wiley&Sons Ltd.    

年代:1995

数据来源: WILEY

摘要:

AbstractTwo mid‐scale laboratory gallery fire tests, the propane gallery and the BELT test, were constructed and evaluated. In both cases the fundamental parameter that can be used for ranking flammability of a belting is the total quantity of heat input into the sample, rather than length burned or flame‐out time. The temperature and velocity of the ventilating air used were found, experimentally and theoretically, to be critical factors in determining the results of the tests. The two tests correlated qualitatively on a pass|fail basis; however, the BELT test was affected more by the thickness of the sample: the thicker, the more probable to pass the test. The BELT test has the advantages of easier control and producing fewer pollutants. The results of BELT, propane gallery and critical oxygen index tests on some beltings are compa

ISSN:0308-0501    

DOI:10.1002/fam.810190104

出版商:John Wiley&Sons Ltd.    

年代:1995

数据来源: WILEY

摘要:

AbstractIn the later part of 1992 the National Research Council of Canada (NRC), in collaboration with a number of industry and governmental partners, commenced a research program to quantify sound‐transmission‐class and fire‐resistance ratings for gypsum‐board protected wood‐frame and steel‐frame building assemblies. The ‘partners’ include Forintek Canada Corp. acting on behalf of Canada's wood products industry. Although thousands of fire‐resistance tests have been carried out over the past century, many of which were on wood‐frame constructions, three interrelated issues arose in regard to the wood studs used in these tests: moisture content, strength, and magnitude of the load superimposed on the walls that the studs would be required to withstand during the fire tests. This paper dis

ISSN:0308-0501    

DOI:10.1002/fam.810190105

出版商:John Wiley&Sons Ltd.    

年代:1995

数据来源: WILEY

摘要:

AbstractThe 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−2or 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

ISSN:0308-0501    

DOI:10.1002/fam.810190106

出版商:John Wiley&Sons Ltd.    

年代:1995

数据来源: WILEY

摘要:

AbstractThe electrical circuit for the recently developed transient plane source (TPS) technique for fast and precise measurements of thermal transport properties of solids has been modified for more convenient and more automated measurements. The technique has been tested for measurements of thermal conductivity and thermal diffusivity for a series of building materials ranging from thermally insulating materials (extruded polystyrene and PMMA) to good thermal conductors (stainless steel and aluminium). The results obtained in this work agree well with other techniques and international standard materials. This agreement indicates that the TPS method is accurate to within ±5% over a thermal conductivity range of four orders of magnitude (0.02 W m−1K−1to 200 W m

ISSN:0308-0501    

DOI:10.1002/fam.810190107

出版商:John Wiley&Sons Ltd.    

年代:1995

数据来源: WILEY

ISSN:0308-0501    

DOI:10.1002/fam.810190108

出版商:John Wiley&Sons Ltd.    

年代:1995

数据来源: WILEY

ISSN:0308-0501    

DOI:10.1002/fam.810190109

出版商:John Wiley&Sons Ltd.    

年代:1995

数据来源: WILEY

ISSN:0308-0501    

DOI:10.1002/fam.810190101

出版商:John Wiley&Sons Ltd.    

年代:1995

数据来源: WILEY