It is well known that through the structural design, the safety and economic considerations of the project represent major factors, which must be always in mind. From this point of view, the concept and idea of “Stratified Concrete” were developed. Stratified Concrete consists of two or more types of concrete; in particular, composite materials consisting of High Strength Concrete (HSC) and Normal Strength Concrete (NSC). This study showed the flexural behavior for stratified sections (HSC-NSC) by taking a short time lap (1 h) between the two mixes to get a good bond between them. An experimental program was conducted to investigate the flexural behavior of NSC (25 MPa), HSC (60 MPa), and three HSC-NSC with the effect of changing the thickness of the HSC layer of slabs (20, 40, 75 mm) that had subjected to double static loads. As well, these slabs’ experimental results were numerically verified. The most important achievement is the success of the idea of casting different strengths of concrete layers using a short time interval to improve the bending behavior of the slabs, and reach the superior thickness of the HSC layer, which represents almost a quarter of the slab thickness.

众所周知，通过结构设计，项目的安全和经济考虑是主要因素，必须始终牢记这些因素。从这个角度出发，提出了“分层混凝土”的概念和思想。层状混凝土由两种或更多种类型的混凝土组成。特别是由高强度混凝土（HSC）和普通强度混凝土（NSC）组成的复合材料。这项研究通过在两种混合物之间放置一小段时间（1小时）以使它们之间具有良好的粘结性，从而显示了分层切片（HSC-NSC）的弯曲行为。进行了一个实验程序来研究NSC（25 MPa），HSC（60 MPa）和三个HSC-NSC的弯曲行为，并改变了板的HSC层厚度（20、40、75 mm）承受了两倍的静载荷。还有 这些板的实验结果进行了数值验证。最重要的成就是成功实现了在较短的时间间隔内浇铸不同强度的混凝土层以改善板的弯曲性能并达到HSC层优异厚度的想法，该厚度约占板厚的四分之一。