The curing time of concrete shall comply with the following provisions:

1）采用硅酸盐水泥、普通硅酸盐水泥或矿渣硅酸盐水泥配制的混凝土，不应少于7d；采用其他品种水泥时，养护时间应根据水泥性能确定；大型混凝土搅拌机

1) The concrete prepared with Portland cement, ordinary portland cement or slag Portland cement shall not be less than 7d; When other types of cement are used, the curing time shall be determined according to the cement performance; Large concrete mixer

2）采用缓凝型外加剂、大掺量矿物掺合料配制的混凝土，不应少于14d；大型混凝土搅拌机，抗渗混凝土、强度等级C60及以上的混凝土，不应少于14d；后浇带混凝土的养护时间不应少于14d；大型混凝土搅拌机，

2) The concrete prepared with retarding admixture and large amount of mineral admixture shall not be less than 14d; Large concrete mixer, impermeable concrete and concrete with strength grade C60 and above shall not be less than 14d; The curing time of post cast strip concrete shall not be less than 14d; Large concrete mixer,

3）地下室底层墙、柱和上部结构首层墙、柱宜适当增加养护时间；基础大体积混凝土养护时间应根据施工方案确定。

3) The curing time of basement bottom wall and column and superstructure first floor wall and column should be appropriately increased; The curing time of foundation mass concrete shall be determined according to the construction scheme.

2.洒水养护应符合下列规定：

2. Watering and curing shall meet the following requirements:

洒水养护宜在混凝土裸露表面覆盖麻袋或草帘后进行，也可采用直接洒水、蓄水等养护方式；大型混凝土搅拌机，洒水养护应保证商品混凝土处于湿润状态；当日低温度低于5℃时，不应采用洒水养护。

Watering maintenance should be carried out after the exposed surface of concrete is covered with gunny bags or straw curtains, or direct watering, water storage and other maintenance methods can be adopted; For large concrete mixer, watering and curing shall ensure that the commercial concrete is wet; When the low temperature of the day is lower than 5 ℃, watering shall not be used for curing.

3.覆盖养护应符合下列规定：

3. Covering and curing shall meet the following requirements:

1）覆盖养护宜在混凝土裸露表面覆盖塑料薄膜、塑料薄膜加麻袋、塑料薄膜加草帘进行；

1) Covering and curing should be carried out by covering the exposed surface of concrete with plastic film, plastic film plus gunny bag and plastic film plus straw curtain;

2）大型混凝土搅拌机，塑料薄膜应紧贴混凝土裸露表面，塑料薄膜内应保持有凝结水；

2) For large concrete mixer, the plastic film shall be close to the exposed surface of concrete, and there shall be condensate in the plastic film;

3）覆盖物应严密，覆盖物的层数应按施工方案确定。

3) The covering shall be tight, and the number of layers of the covering shall be determined according to the construction scheme.

4.喷涂养护剂养护应符合下列规定：

4. Spraying curing agent shall meet the following requirements:

1）应在混凝土裸露表面喷涂覆盖致密的养护剂进行养护；

1) The exposed surface of concrete shall be sprayed with dense curing agent for curing;

2）养护剂应均匀喷涂在结构构件表面，不得漏喷；养护剂应具有可靠的保湿效果，保湿效果可通过试验检验；

2) The curing agent shall be evenly sprayed on the surface of structural members without missing spraying; The curing agent shall have reliable moisturizing effect, and the moisturizing effect can be tested;

3）养护剂使用方法应符合产品说明书的有关要求。

3) The use method of curing agent shall comply with the relevant requirements of the product manual.

5.基础大体积混凝土裸露表面应采用覆盖养护方式：

5. The exposed surface of foundation mass concrete shall be covered and cured:

当混凝土表面以内40mm～80mm位置的温度与环境温度的差值小于25℃时，可结束覆盖养护。覆盖养护结束但尚未到达养护时间要求时，可采用洒水养护方式直养护结束。

When the difference between the temperature within 40mm ~ 80mm of the concrete surface and the ambient temperature is less than 25 ℃, the covering curing can be ended. When the covering curing is completed but the curing time requirements have not been met, the watering curing method can be adopted until the curing is completed.

6.柱、墙混凝土养护方法应符合下列规定：

6. The curing method of column and wall concrete shall comply with the following provisions:

地下室底层和上部结构首层柱、墙混凝土带模养护时间，不宜少于3d；带模养护结束后可采用洒水养护方式继续养护，必要时也可采用覆盖养护或喷涂养护剂养护方式继续养护；大型混凝土搅拌机，其他部位柱、墙混凝土可采用洒水养护；必要时，也可采用覆盖养护或喷涂养护剂养护。

The curing time of concrete with formwork for the column and wall on the first floor of basement and superstructure shall not be less than 3D; After the completion of formwork curing, watering curing can be used to continue the curing. If necessary, covering curing or spraying curing agent can also be used to continue the curing; Large concrete mixer, column and wall concrete in other parts can be cured by watering; If necessary, it can also be cured by covering or spraying curing agent.

7.混凝土强度达到1.2N/mm2前，不得在其上踩踏、堆放荷载、安装模板及支架。同条件养护试件的养护条件应与实体结构部位养护条件相同，并应采取措施妥善保管。大型混凝土搅拌机，施工现场应具备混凝土标准试件制作条件，并应设置标准试件养护室或养护箱。标准试件养护应符合现行有关标准的规定。

7. Before the concrete strength reaches 1.2n/mm2, it is not allowed to step on it, stack load, install formwork and support. The curing conditions of specimens cured under the same conditions shall be the same as those of solid structure parts, and measures shall be taken to keep them properly. For large-scale concrete mixer, the construction site shall have the conditions for making concrete standard specimens, and a standard specimen curing room or curing box shall be set. The curing of standard specimens shall comply with the provisions of relevant current national standards.