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HYPOTHESIS ON THE NATURE OF COHESIVE BONDS IN PORTLAND CEMENT CONCRETE,
ARIZONA STATE UNIV TEMPE
Failure of concrete specimens, along a plane that is largely composed of aggregate surfaces, indi cates that the strength of concrete is limited by the strength and number of gel-aggregate bonds. Aggregate particles exhibit a negative charge, which attracts a cloud of charge-balancing ca tions to their outer surface. Since the attrac tive force between two such particles can be increased by a collapsing of these cation clouds, this indicates that an appreciable strength in crease can be obtained in this manner. To the best of the authors knowledge, this cation con cept is a new and original approach to the ex planation of concrete strength. The experiments contained herein cannot, of course, be considered as full and final proof of this hypotheses. How ever they do give the impression that improvement in concrete strength is a distinct possibility of continued research along this line of reasoning. Author
Master's thesis. Original contains color plates; all DDC reporductions will be in black and white. Original may be seen in DDC Hq.