|
Consider the need for half blocks, two-third, and one-third sizes, if
the blocks are being laid in a staggered block pattern; and make the
forms to cast them exactly as for the full-sized blocks, but use the proper
dimensions. Hexagonal, triangular, and octagonal forms may also be
worked out by the adept amateur; when carefully measured and well
cast they will fit together exactly and with beautiful effect. Diamond
patterns also may be used, being made fat or thin according to the
space and the effect wanted. Long thin diamonds will make a narrow
space look longer and narrower if the diamonds are used with the long
measure parallel to the length of the narrow space; but if they are used
the other way around, the narrow space seems less long and narrow, a
more pleasantly proportioned area. Consider this principle when paving
a terrace which is long and narrow, or one which is too square for good
proportions but about which nothing can be done because of space
factors beyond your control.
. . . mixing the concrete
Accurate measurement of ingredients, plus thorough mixing of them,
always makes good, strong, durable concrete. The following proportions
will make a good basic mixture:
1 part Portland Cement
3 Parts of sand (or sand plus gravel or other aggregates)
l part of water (vary more or less to get a good workable mixture)
To get some idea of what quantities of materials will be needed, fill
your locked-up form with sand, heaping it up a little. Then open the
form and pour this sand into the pail or other receptacle you will be
using for measuring the ingredients. Three times the quantity of this
measure of sand with 1 measure of cement and 1 measure of water will
make three paving blocks. Although five measures have been used, the
water carries the fine particles of cement between the particles of sand,
so there will be no appreciable increase of quantity over the measure of
sand. In fact, we recommend adding a little extra sand so as to be sure
there will be enough; a handful or two of extra cement will help, too.
Put these ingredients into your wheelbarrow or mixing box and stir
them up dry with the hoe until there are no more streaks of pure cement
or pure sand, but just a mass of even grey-brown color.
|
