噴泉施工時槽四邊圍使用水泥沙漿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、原材料的選用：為了降低水化熱，采用32.5級礦渣水泥；考慮混凝土可泵性，降低收縮，保證強(qiáng)度，提高混凝土的耐久性和抗裂性，采用5-31.5mm的連續(xù)徑粒碎石；為了達(dá)到混凝土拌和物28.5度的出灌溫度，采用深井地下水?dāng)嚢?；在混凝土中摻和UEA膨脹劑和超緩型高效泵送劑，補(bǔ)償混凝土的收縮，延緩水化物的釋放，減少底板的溫度應(yīng)力，提高可泵性；在混凝土中摻入Ц級粉煤灰。
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、澆筑方法：要求一次性澆筑完成，不留施工縫，加強(qiáng)池底及池壁的防滲水能力?；炷翝仓捎脧牡椎缴稀靶泵娣謱?、循序漸進(jìn)、薄層澆筑、自然流淌、連續(xù)施工、一次到頂”的澆筑方法。
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、振搗：應(yīng)嚴(yán)格控制振搗時間、振搗點間距和插入深度，避免各澆筑帶交接處的漏振。提高混凝土與鋼筋的握裹力，增大密實度。
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、表面及泌水處理：澆筑成型后的混凝土表面水泥砂漿較厚，應(yīng)安設(shè)計標(biāo)高用刮尺刮平，趕走表面泌水，初凝前，反復(fù)碾壓，用木抹子搓壓表面2-3遍，以逼和收水裂縫。
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、混凝土養(yǎng)護(hù)：如工程施工，正值秋季，中午、夜晚溫差較大，為保證混凝土施工質(zhì)量，控制溫度裂縫的產(chǎn)生，采取蓄水養(yǎng)護(hù)。蓄水前，采取先蓋一層塑料薄膜，一層草袋，進(jìn)行保濕臨時養(yǎng)護(hù)。
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.
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