Show Method for Increasing Strength of Concrete The strongest concrete will wilt be obtained obtained ob oh- tamed by the least possible amount of ot water In the mixing to produce a plastic mortar or mix but after atter the concrete Is placed the concrete should be k kept pt wet for tor at least ten tea days If It great strength of at wear vear or strain Is s needed as as as- asIn In highways Keeping the con concrete rete damp the first ten days adds 7 75 per cent to Its Us com corn strength and adds 03 05 per percent percent percent cent to Its resistance to wear Three weeks of ot constant moisture moIsture- will add still sUII greater strength and resistance Constant sprinkling may not be pos sible Cover the concrete deeply with dirt sand hay hay- or anything that will w hold moisture and It will serve the purpose desired |