What is Low Alkali Cement?
Some aggregates may contain forms of reactive amorphous silica. In the presence of water, this can react with the soluble alkali content of cement and form locally an expansive gel that can deteriorate the concrete. In such case cements are produced to have lower content of K2O and Na2O or to add some special pozzolan or slag material which can immediately react with alkali and prevent subsequent reaction with aggregates in the concrete.
