【Daily Question】【Civil Engineering Version 20180622
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Which of the following are the construction requirements for composite masonry? ( ) A. The strength grade of the surface cement mortar should not be lower than M15, with a thickness of 30–45 mm. B. The strength grade of the surface concrete should be C20, and its thickness should be greater than 45 mm. C. The strength grade of the masonry mortar should not be lower than M7.5. D. When there are more than 4 reinforced bars on one side of a composite masonry structure, additional stirrups and tie bars should be installed. E. The diameter of the reinforcing bars should be 3–4 mm. Answer: BCD. 【Explanation】The strength grade of the surface cement mortar should not be lower than M10, with a thickness of 30–45 mm. The strength grade of the surface concrete should be C20, with a thickness of more than 45 mm. The strength grade of the masonry mortar should not be lower than M7.5. When there are more than 4 reinforcing bars on one side of the composite masonry, additional stirrups and tie bars should be provided.
The strength grade of the BCD surface cement mortar should not be lower than M10, with a surface thickness of 30–45 mm. The strength grade of the surface concrete should be C20, with a thickness of more than 45 mm. The strength grade of the masonry mortar should not be lower than M7.5. When there are more than 4 reinforcing bars on one side of the composite masonry, additional stirrups and tie bars should be provided.
B. The strength grade of the surface concrete should be C20, with a thickness of more than 45 mm. C. The strength grade of the masonry mortar should not be lower than M7.5. D. When there are more than 4 reinforcing bars on one side of the composite masonry, additional stirrups and tie bars should be installed