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Windows
Published in Michael McEvoy, External Components, 2014
Mastic jointing A mastic seal to a joint is used where some degree of movement is likely to occur, usually between dissimilar materials, such as between metal and plastic or brickwork. The function of mastic is to accommodate movement, provide weather-proofing and seal against draughts, dust or fumes. Steel window technology is very reliant on the use of mastic particularly in the construction of composite assemblies. A mastic will only fulfil these functions if it satisfies an exacting set of requirements. The various types of mastic and their uses are discussed in MBS: Materials chapter 16 and for the use of mastics in curtain walling, etc., see MBS: Structure and Fabric Part 1. Having made the correct choice of mastic it is essential that the joint is designed so that unreasonable demands are not made on the jointing material in its effort to accommodate movement. The application of mastic seals for bedding and fixing window frames is shown in fig. 4.34.
The essential paving properties of bitumen, asphalt and cement
Published in Maxwell Lay, John Metcalf, Kieran Sharp, Paving Our Ways, 2020
Maxwell Lay, Metcalf John, Sharp Kieran
Mastic: a mixture of bitumen and sand or of powdered asphaltic rock and sand, softened by heat or by the addition of more volatile oils or bitumens. The term came from mastics that had been derived from tree saps. The material certainly has some similarities with the tree-sap mastics, which also soften when heated or moulded. Mastic could be delivered to paving sites as blocks or cheeses that would then be reheated to make them fluid enough to form into a pavement (Figure 11.1).457 The term bituminous mastic highlighted its use of bitumen. Asphaltic mastic was commonly made from powdered rock asphalt.
Effect of filler in asphalt mastic on rheological behaviour and susceptibility to rutting
Published in International Journal of Pavement Engineering, 2021
Song Li, Fujian Ni, Qiao Dong, Zili Zhao, Xiang Ma
Asphalt mixture is regarded as a heterogeneous pavement material comprising three phases: aggregate, mastic and air void. The proportion of each plays a major role in the resistance to rutting of asphalt pavement. However, the rheological response that results in permanent deformation of asphalt pavement is mainly dependent on the mastic. Mastic is a compound composed of an asphalt binder with elastic, viscoelastic or viscous characteristics, as well as filler particles of an elastic nature (White 2017). Its rheological response is a result of the combination of each component’s mechanical properties. Investigating the rheological properties of mastic can contribute to a better understanding of the effect of mastic on the anti-rutting performance of asphalt mixture.