The above reactions are incorporated in lic model, whose implications of certain assumptions about overall reaction rates or material properties can be checked. Therefore, in this study, the pervious experimental results of cement paste with10%, 20% limestone substitutions are used to validate the output results of lic model [10,20].3.2.1. Results and discussionThe degree of hydration of cement paste without and with 20% substitution of limestone respectively is shown in Fig. 6. Results indicate that modified lic model provides a good prediction of the influence of limestone substitution on the hydration rate of these blended materials. It was observed from this figure that model results would nearly match these modified CEMHYD3D model results [10] and the experimental results of Bonavetti et al. [20]. The cement paste with different limestone substitu tion 5%, 10% with water cement ratio of 0.4 is modeled to cover the range of European Standard EN 197-1:2011 and Egyptian specification ESS 4756-1/2009 and ASTM C 150. In Fig. 7, the acceleration effect of cement hydration by limestone substitution is observed; this is what in fact has been observed experimentally in the literature. However, there is no significance difference between degrees of hydration of cement paste with lime stone substitution up to 10%. Fig. 5, presents the Microstructural development of 20% substitution of limestone after hydration and at a degree of hydration of 0.9.
đang được dịch, vui lòng đợi..