The reading passage contends that there are several evidences that support the an idea that the pyramids were made with concrete. On the other hand, the lecturer brings up several points that contradict this argument.
First of all, according to the lecturer, the idea that the pyramids were made with concrete is not reliable. This is because there are no evidences in objects, which were made out of concrete by Egytions. Also, the Egyption vase made with concretes doesn't exist. The vase came from the stones in two halves and was pasted with glue adherent.(접착제 의미로 쓰신것같아서) This casts doubt on the reading, which states that the Egytion was skillful enough to mold concrete to make an object.
In addition, the lecturer argues that the air bubbles that were generated in the pyramid are not came from the concrete. Since many restoration processes were conducted in the past, all kinds of modern materials were involved to create the pyramid, and it is more likely that the air bubbles came from these materials. This refutes the reading passage's assertion that the reason why air bubbles were created is due to the low density of the pyramids.
The final point made by the lecturer is that human activities causes moisture in the pyramid. To be specific, when people breath, the air is exerted and it increases humidity level, and since many people visit the pyramid, the humidity level tends to drastically increased. This counters the writer's acclaim that a high humidity came from the molded concrete. |