喷泉施工时槽四边围使用水泥沙浆砌筑需要注意哪些方面？
What aspects should be paid attention to when using cement mortar in four sides of the trough?
1、原材料的选用：为了降低水化热，采用32.5级矿渣水泥；考虑混凝土可泵性，降低收缩，保证强度，提高混凝土的耐久性和抗裂性，采用5-31.5mm的连续径粒碎石；为了达到混凝土拌和物28.5度的出灌温度，采用深井地下水搅拌；在混凝土中掺和UEA膨胀剂和超缓型高效泵送剂，补偿混凝土的收缩，延缓水化物的释放，减少底板的温度应力，提高可泵性；在混凝土中掺入Ц级粉煤灰。
1. Selection of raw materials: in order to reduce the heat of hydration, 32.5 grade slag cement is used; considering the pumpability of concrete, reducing shrinkage, ensuring strength, improving durability and crack resistance of concrete, 5-31.5mm continuous diameter gravel is used; in order to reach the temperature of 28.5 degree of concrete mixture, deep well underground water is used to mix; UEA expansive agent and ultra-slow high-efficiency pumping agent are mixed in the concrete to compensate the shrinkage of concrete, delay the release of hydrate, reduce the temperature stress of the floor and improve the pumpability, and_grade fly ash is mixed in the concrete.
2、浇筑方法：要求一次性浇筑完成，不留施工缝，加强池底及池壁的防渗水能力。混凝土浇筑采用从底到上“斜面分层、循序渐进、薄层浇筑、自然流淌、连续施工、一次到顶”的浇筑方法。
2. Pouring method: one-time pouring is required, no construction joints are left, and the anti-seepage ability of pool bottom and wall is strengthened. The concrete pouring adopts the pouring method of "inclined plane layering, progressive, thin layer pouring, natural flow, continuous construction, one time to the top" from bottom to top.
3、振捣：应严格控制振捣时间、振捣点间距和插入深度，避免各浇筑带交接处的漏振。提高混凝土与钢筋的握裹力，增大密实度。
3. Vibration: Vibration time, interval between tamping points and insertion depth should be strictly controlled to avoid leakage of vibration at the junction of each pouring belt. Improve the bond strength between concrete and steel bar and increase the density.
4、表面及泌水处理：浇筑成型后的混凝土表面水泥砂浆较厚，应安设计标高用刮尺刮平，赶走表面泌水，初凝前，反复碾压，用木抹子搓压表面2-3遍，以逼和收水裂缝。
4. Surface and bleeding water treatment: The cement mortar on the surface of the concrete after pouring is thicker. The design elevation should be scraped flat with a scraper to drive away the bleeding. Before initial setting, the surface should be repeatedly rolled and rubbed with a wooden eraser for 2-3 times to compel and collect water cracks.
5、混凝土养护：如工程施工，正值秋季，中午、夜晚温差较大，为保证混凝土施工质量，控制温度裂缝的产生，采取蓄水养护。蓄水前，采取先盖一层塑料薄膜，一层草袋，进行保湿临时养护。
5. Concrete maintenance: For example, in autumn, the temperature difference between noon and night is large. In order to ensure the quality of concrete construction and control the occurrence of temperature cracks, water storage maintenance is adopted. Before storing water, a layer of plastic film and a layer of straw bags should be first used for temporary moisture conservation.