The book Practical Concrete Work for the School And Home was written by author Henry Colin Campbell Here you can read free online of Practical Concrete Work for the School And Home book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Practical Concrete Work for the School And Home a good or bad book?
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Tooled Surfaces. — Another method of finishing the con- crete surface is to tool it in several ways similar to the methods of cutting or tooling stone. But in preparing for such a surface finish it is necessary to pay particular attention to selecting the aggregate and still greater attention to pro- portioning the concrete mixtures so that it will be certain there is sufficient cement used to fill all voids or air spaces in the bulk of aggregates, thus firmly bonding all particles into one sol...id mass. If mixtures are lean, that is, contain too little cement, there will not be enough bonding or binding material in the mass to prevent the small particles of aggregate from being dislodged or broken out when tooling the surface. ^^^len a concrete surface is to be tooled, it is necessary that the concrete be allowed to harden for a greater length of time than for the washing methods. The concrete must have an almost flint-like hardness so that aggregate particles will not be broken out of the surface.
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