Ordinary concrete mix design rules JGJ55-2011 in the sand material 28d compressive strength is what glue
Weighs you ~ ~ what is your problem ah? The 28d refers to the 28 days
More to see the specification to know: "cement mortar strength test method CISO method" GBjT; do cement mortar strength of the standard method, the new specification should be the strength of cement mortar material should be containing the admixture, anyway it has Conversion value, if the strength of the cement can also be calculated!
Mortar = cementitious material + standard sand gelling material, formerly refers to the cement, the new standard refers to the cement is replaced by fly ash. 450 cement, replaced by fly ash slag 10%, that is, 360 cement, 4 tiger harbor suppression of the tide of the tide attack 5 gray fly ash, 45 ore powder by the previous super-mixed coefficient to increase the amount of glue, and now through Affect the coefficient to reduce the strength of rubber, and then increase the amount of glue
