A furnace for use in combustion studies

✍ Scribed by Chamberlain, G. H. N.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1949
• Weight: 244 KB
• Volume: 68
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000680302

✦ Synopsis

of soil by j h r r of resinous tirarrrid particles in I g. of the sandy loam soil used throughout the experiments (having 257: of particles of < 2p equivalent particle diameter), then the area to be covcred by a rcsin film capable of resisting high compression is of the order of 0.6 sq. m.,'mg. of soil. From Fig. g it will be seen that a film of " Vinsol " resin on an acid substrate will not withstand 60 dyneslcm. surface pressure until the surface concentration is of the ordcr of 0.05 sq. m./mg. Hence 10 mg. of resin would be required to cover the airlwater interface in 1 g. of soil, corrcsponding to a bulk concentration of 1%. This concentration is of the order of that found to b: neccssary in the capillary absorption tests described in previous sections. It is apparent that this correlation will not be very accurate, for two reasons : (a) because the air;water interface will be smaller than the specific particle surface, due to particle aggregation and coalescence of the water films surrounding the particles, and (b) it is unlikely that all the resin incorporated in powder form inK0 the soil would spread as a film on the airjwater interface, since after a certain m a of film had spread out from a particular particle of resin, this film would tend to resist the spreading of further molecules from the surfaces of thc resin particle that wcrc in contact with the intcrface. Howevcr, these two effects will operate in opposite directions, and it can be said that the compressed film theory gives a general correlation between the behaviour of resin films on a surface balance and the amounts rcquired for optimum waterproofing in practicc.

It amears, therefore, that to have a waterproofing effect

The work was carried out as part of the programme of the Road Research Board, and the paper is published by permission of the Director of Road Research.