. Practical concrete work for the school and home. ooccasional handling. Therefore the permissible requirementsof aggregates may be modified somewhat in applying them toschool or home work for some small objects. For instance,it is much easier to secure asmooth surface on a concreteflower box or a vase, if thecoarse aggregate is omitted en-tirely and a slight excess ofcement used with sand only—the sand, of course, being prop-erly graded. It is possible togive a very attractive surfacefinish to concrete work in anumber of ways, some of whichare controlled entirely by select-ing aggregate in wh
. Practical concrete work for the school and home. ooccasional handling. Therefore the permissible requirementsof aggregates may be modified somewhat in applying them toschool or home work for some small objects. For instance,it is much easier to secure asmooth surface on a concreteflower box or a vase, if thecoarse aggregate is omitted en-tirely and a slight excess ofcement used with sand only—the sand, of course, being prop-erly graded. It is possible togive a very attractive surfacefinish to concrete work in anumber of ways, some of whichare controlled entirely by select-ing aggregate in which the par-ticles are all of uniform size ornearly so, and then treating thissurface in a number of wayswhich will be described , Clean Water Neces-sary.—The water used in con-crete mixtures must be pureand clean. It should not con-tain acid, oil nor alkali, nor becloudy, due to the presence ofclay, loam, silt or similar mat-ter in suspension. It should be good enough to drink. If itis of such quality, it will be best for A simple easily made concrete fern 22 PRACTICAL CONCRETE WORK FORMS FOR CONCRETE WORK General.—To use concrete in making any object, it isnecessary that the material, while in a plastic state, be con-fined in some form or mold which has an interior surface andshape corresponding- to that of the object which is to be forms or molds are the receptacles in which a con-crete mixture is placed immediately after mixing so that whenhardened the concrete will assume the shape desired or in-tended. ■.-i ••—=11 Sp/ict
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