Influence of the expansion agents on the contact stresses induced by the cement stone solution during the hardening
In the article, as reflected in the cement hydration contraction effect negatively affects the insulating capacity of the cement ring.The expansion agents are put into the cement for the elimination of the contraction. The authors discusses the influence of the expanding plugging materials on the growth of the normal stresses between the cement sheath and the contact surfaces during the hardening of the cement stone solution.