mixes the admixture formulation may further contain at least one retardant for decelerating the setting of the concrete or cementitious materials the admixture formulation may further contain at least one solvent for diluting the admixture the admixture formulation may further contain at least one protecting agent or biocide selected and provided in a dose that inhibits or appreciably retards bacterial growth more particularly the admixture formulation may contain by weight of the admixture a about 0 3 5 0 polyphosphate such as sodium tripolyphosphate stp typically at least 0 6 or at least 0 8 and more typically 1 0 5 0 1 2 5 0 1 5 5 0 1 5 4 0 or 1 5 3 0 b about 1 0 5 0 cement accelerator such as triethanolamine tea and c about 0 01 0 06 surfactant such as a non ionic surfactant for example nonylphenol ethoxylate the admixture formulation may further contain by weight of the admixture d about 5 14 sugars and or e about 0 01 0 03 polar solvent such as an alcohol for example isopropyl alcohol and or f about 0 1 0 5 biocide such as an aqueous solution of ethylenedioxy dimethanol 2 octyl 2 h isothiazol 3 one often called mergal v698 k 4 or formalin aqueous solution of about 37 formaldehyde and about 10 methanol and or g an additional solvent such as water typically about 75 92 the inventive admixture is physically chemically and biologically stable in particular chemical stability of the admixture.