دراسة سلوك الجوائز البيتونية على القص باستخدام بيتون عادي NC وبيتون ذاتي الاكتناز SCC : تجريبيا و حسابيا

الملخص EN

Self-compacting concrete is the product of advances in the field of concrete additives, where additives for viscosity modifiers and additives for reducing mixing water (super plasticizers) are the two main components required to produce this concrete.

in this research, an experimental study was conducted on five self-compacting concrete beams and five normal concrete beams exposed to a four-point moment load.

the dimensions of each beam (150*300*2000) mm, for shear reinforcement ratio (0-0.27-0.38) %, and for different shear span to effective depth ratio (a/d=2-2.5-3).

the deflection was measured in the middle of the beams and the ultimate shear strength was determined experimentally and mathematically according to some international codes and some researchers.

a modified equation was proposed on equation of calculating shear strength of the Canadian code for self-compacting concrete.

the experimental results showed that the ultimate shear strength for self-compacting concrete beams was greater than the ultimate shear strength for normal concrete beams for beams without shear reinforcement although the compressive strength and flexural strength and splitting tensile strength were greater in normal concrete compared to self-compacting concrete, and the average increase (8.7%), and the results showed that the ultimate shear strength for normal concrete beams was greater than ultimate shear strength for self-compacting concrete beams for beams with shear reinforcement, and the average increase (13.4%).

the relationship (load – deflection) was drawn from the experiments and then the deflection was computed using the effective moment of inertia.

a correction factor (k) was proposed on the calculation values and by comparing corrected calculation values with the experimental values the average difference does not exceeded the value (6.3 %) in self-compacting concrete beams and (10.9 %) in normal concrete beams.