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如何避免护坡模具产生裂缝
发布人:管理员   发布时间:2020-12-25

护坡模具过程中所产生的裂缝,而对于这种事情的发生所能避免的措施主要是:
The main measures to avoid this kind of thing are as follows:

1.尽量选用低热或中热降低泥矿渣水泥、粉煤灰水泥;减少水泥用量,将水泥用量2尽量控制在450kg/m以下。
1. Select low heat or medium heat cement to reduce slag cement and fly ash cement as far as possible; reduce the amount of cement and control the amount of cement below 450kg / m as far as possible.

2.降低水灰比,一般混凝土的水灰比控制在0.60以下;改善骨科级配,掺加粉煤灰或高效减少水剂等来减少水泥用量,降低水化热。
2. Reduce the water cement ratio, control the water cement ratio of general concrete below 0.60; improve the orthopedic grading, add fly ash or high efficiency water reducing agent to reduce the amount of cement, reduce the heat of hydration.

3.改善混凝土的搅拌工艺,采用"二次风冷"新工艺降低混凝土的浇筑温度;在混凝土中掺加一定量的具有减水、增塑、缓凝等作用的外加剂,改善混凝土拌和物的流动性、保水性,降低水热化,推迟热峰出现的时间。
3. Improve the mixing process of concrete, adopt the new technology of "secondary air cooling" to reduce the pouring temperature of concrete; add a certain amount of admixtures with water reducing, plasticizing, retarding and other functions in the concrete to improve the fluidity and water retention of concrete mixture, reduce the hydration and delay the time of hot peak.

    

4.合理安排施工工序,分层、分块浇筑,以利于散热,减小约束。
4. Reasonable arrangement of construction procedures, layered, block pouring, in order to help heat dissipation, reduce constraints.

5.在大体积混凝土内部设置冷却管道,通过冷水或冷气冷却,减小混凝土的内部温差;加强混凝土温度的监控,及时采取冷却保护措施。
5. Set up cooling pipes inside the mass concrete to reduce the internal temperature difference of the concrete by cooling with cold water or air; strengthen the monitoring of the concrete temperature and take cooling protection measures in time.

6.混凝土浇筑后,及时用湿润的草帘、麻片等覆盖,并洒水养护,适当延长养护时间,保证混凝土表现缓慢冷却,在寒冷季节,混凝土两面必须采取保温措施,以防寒潮袭击。
6. After the concrete is poured, it shall be covered with wet straw curtain and hemp piece in time, and the curing time shall be extended appropriately to ensure the slow cooling of concrete. In cold season, insulation measures must be taken on both sides of concrete to prevent cold wave attack.

 

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