... component. Manufactured goods and to panel ,use 12—19mm fiber. Each cube concrete, cement content in 350kg,the minimum amount per ... with 0.9kg fiber, cement content above 350kg, according to every increase in a liter cement and icrease 2 grams of fiber requirement ... , the minimum amount 1.2kg.when cement content in 400kg,according to every increase 1kg,and increase 3kg fiber requirement improve ...