Masonry Units From Soil And Bitumen


A process is described for the manufacture of a new building material from soil and bitumen which competes with conventional masonry products in both compression and tension and possesses excellent water repellence and frost resistance.  Selected soil, which is preheated to 150 C, is charged to a pug-mill mixer, where molten straight run bitumen, at a maximum viscosity of 0.2 Pa.s is then added.  The two constituents are mixed until all the soil particles are fully coated with bitumen.  The mixture is then cooled and the resulting free-flowing powder is placed and compacted in a mould to form the required shape of unit suitable for construction purposes. The unit is then removed  from the mould and cured by heating in an oven for up to 1 day.  During curing, the blocks undergo no warping and practically no shrinkage.  This process of soil-bitumen mixing, compacting and curing is critical, but entirely practicable.   The nature of the soil and bitumen constituents, and the percentage of bitumen combined with the soil, were found to be important.  The standard basic properties of the unit are presented.  11 refs.

Primary author(s): Forth J P; Zoorob S E

                            Leeds,University; Nottingham,University

Source: Masonry (9). Proc.6th Int.Masonry Conf.

            London,4-6 November 2002,p.163-166

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