Tensile strength

For assessing tensile strength of the cement , six standard briquettes are made from cement mortar . ALl these briquettes are made from cement mortar . All these briquettes are fratured after 1 day , 3 days and 7 days of immersion in water . The average strength of briquettes ater 1 , 3 and 7 days immersion should be as follow :

Time immersion                Ordinary cement              rapid hardening cement
after 1 days                             -                                        20kg/cm3
after 3 days                              20kg/cm2                              30  kg/cm3
after 7 days                                 25 kg/cm2                                  -