measured at 5 078 psi upon further heating to 2 500 u00b0 f a u03c1 of 142 pcf was provided and the ccs was measured at 10 540 psi to help summarize the benefits of the present invention the relevant experimental data collected in the above identified experiments one through seven has been summarized in table i hereinbelow table i__________________________________________________________________________experiment mgo particle cold crushingnumber mgo size mesh al h sub 2 po sub 4 sub 3 peak exotherm strength psi __________________________________________________________________________experiment 1 0 55 100 2 20 nominal 3 925 at 1 000 u00b0 f experiment 2 1 59 12 5 62 nominal 2 218 at 230 u00b0 f experiment 3 0 95 100 5 27 nominal 3 424 at 750 u00b0 f 3 728 at 2 000 u00b0 f experiment 4 1 01 100 5 62 nominal 6 396 at 750 u00b0 f 3 362 at 2 000 u00b0 f experiment 5 1 37 100 7 31 nominal 6 988 at 750 u00b0 f 6 306 at 2 000 u00b0 f experiment 6 2 03 100 7 24 nominal 5 565 at 2 000 u00b0 f 8 227 at 2 500 u00b0 f experiment 7 1 31 100 6 99 nominal 4 456 at 750 u00b0 f 5 078 at 2 000 u00b0 f 10 540 at 2 500 u00b0 f __________________________________________________________________________ as evident from table i the concentration of mgo ranged from 0 55 to 2 03 percent and the average mgo used was 1 27 percent moreover the concentration of al h 2 po 4 3 used in each of the experiments ranged from 2 20 to 7 31 percent and the average al.