台州职业技巧学院1砌体功课(国外英文资料).doc

台州职业技术学院1砌体作业(国外英文资料) What are the technical properties of masonry mortar? Answer: the technical nature of masonry mortar: the main requirement of the mortar is good and easy. A good and easy mortar is easily coated with a thin layer on a rough brick floor, and can be tightly bonded to the base. It is easy to use and easy to make the mortar, which is easy to operate and improve the productivity of labor and ensure the quality of the project. The mortar shall have the necessary strength and the adhesive force on the base surface, and should be suitable for deformation performance What are the strength levels of mortar? How to measure? Answer: the mortar is divided into M2.5, M5.0, M7.5, M10, M15, M20 and so on. Mortar strength is the side length of 70.7 ㎜ x 70.7 ㎜ x 70.7 ㎜ test cube, the temperature is 20 + / - 3 ℃, under a certain humidity curing 28 d, measured ultimate compressive strength. Briefly describe the main points of quality control of masonry mortar. Answer: mortar quality control point: (1) strict raw material quality close. The cement and sand must be reinspected according to the specifications; The mortar shall be strictly forbidden to use fine sand and muddy water. It is strictly forbidden to store in open limestone camps. (2) strict the measurement of materials. The mortar shall be strictly weighted by weight. The match mark must indicate the specific quantity of various materials used for each plate of mortar, and strictly control the dosage of stone plaster (powder). (3) the mortar must be mechanically stirred, and the order and time of stirring are strictly controlled. (4) mortar should be mixed with the mix, cement mortar and cement mortar shall be used in 3h and 4h respectively. When the maximum temperature exceeds 30C during construction, it shall be used within 2h and 3h respectively. The use of the mortar of the retarded agent may be extended according to the specific situation. Note: the use of the slurry with a moderator may be extended ac