Evening Republican, Volume 17, Number 139, Rensselaer, Jasper County, 11 June 1913 — THREE KINDS OF CEMENT. [ARTICLE]

THREE KINDS OF CEMENT.

Wertland, the Natural and Rusarian •r Mas Cement. There are avallahle far conatrw* tlon purposes Portland, matural and puzsolaa or alag cemeata. Omly Port land cement Is duitahla Car reinforced concrete Portland cement la the flatly pat verlsed product roorittag frees tbs calcination to iacipiaat furioa of aa Intimate mixture of pr*»erty proper tloned varying withla comparatively marrow limits. Portland earnest should he used la reinformed concrete construction sad any construction that will ha subjeet to shocks or vibrations or stresses other them direct compression. Natural earnest is the flaaky pah verlsed produet reeultlag from «ko oat clnation of aa argillaceous Umeatoae at a temperature oaly suAatoat to drive off the carbonic sold gas. While the limestone must have a certain composition this eempeetties awy ▼ary la much wider limits thaa la the ease of Portias# cement Natural cement dost not develop Its strength aa quickly, nor is K as uniform la composition as Portland eamsat Natural cement may be used la massive masonry where weight rathei than strength is the essential feature Where economy is the governing factor a comparison may be made between the use of natural cement and a leaner mixture of Portland cement that will develop the earns strength. Puzsolaa or alag cement la the flaw ly pulverised product resulting from grinding a mechanical mixture of granulated basic bleat furnace alag and hydrated lima. Pussolan cement la not nearly so strong, uniform or reliable aa Portland or natural cement, la not extensively used and never In Important work; It should he used only for foundation work underground where it Is not exposed to air or running water.