Precast Concrete Block Chimney Units

After tests were carried out on flues and chimneys at the Champs-sur-Marne Experimental Station, certain principles were established for improving the manufacture of lightweight concrete flue units. At the same time, simple apparatus was developed for carrying out rapid heat- resistance tests on flue units. The article includes a description of the research and the conclusions which can be drawn from it, and deals with the permeability to air, expansion and heat resistance of flue and chimney units, and the way in which the simplified heat resistance testing apparatus is used. This article also includes details of some of the first results of tests which were carried out at the C.S.T.B. Experimental Station in order to establish the effect of the various parameters involved in the manufacture of concrete on its behaviour when subjected to heat.Les essais effectu\ue9s sur les conduits de fum\ue9e et les chemin\ue9 es au Centre Exp\ue9rimental de Champs-sur-Marne ont permis d' obtenir les renseignements n\ue9cessaires pour am\ue9liorer la fabrication des boisseaux de conduit de fum\ue9e en b\ue9ton l\ue9 ger. En m\ueame temps, un appareillage relativement simple a \ue9 t\ue9 mis au point pour tester la r\ue9sistance des boisseaux des conduits de fum\ue9e en b\ue9ton \ue0 une \ue9l\ue9vation rapide de temp\ue9 rature. Cet article comprend une description des recherches effectu\ue9es et des conclusions qui peuvent en \ueatre tir\ue9es. Il traite de la perm\ue9abilit\ue9 \ue0 l'air, de la dilatation et de la r\ue9sistance aux hautes temp\ue9ratures des boiseaux de conduits de fum\ue9e et de chemin\ue9es en b\ue9ton, ainsi que de la simplification de l'appareillage d'essai de r\ue9sistance aux hautes temp\ue9ratures. Cet article comprend \ue9galement des d\ue9 tails sur les premiers r\ue9sultats des essais effectu\ue9s au Centre exp\ue9rimental du C.S.T.B. visant \ue0 d\ue9terminer les effets des divers param\ue8tres impliqu\ue9s dans la fabrication des boisseaux de conduits de fum\ue9e en b\ue9ton sur leur tenue \ue0 la chaleur en service.Peer reviewed: NoNRC publication: Ye