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          如何避免護坡模具產生裂縫
          發布人:管理員   發布時間:2020-12-25

          護坡模具過程中所產生的裂縫,而對于這種事情的發生所能避免的措施主要是:
          The main measures to avoid this kind of thing are as follows:

          1.盡量選用低熱或中熱降低泥礦渣水泥、粉煤灰水泥;減少水泥用量,將水泥用量2盡量控制在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;改善骨科級配,摻加粉煤灰或高效減少水劑等來減少水泥用量,降低水化熱。
          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.改善混凝土的攪拌工藝,采用"二次風冷"新工藝降低混凝土的澆筑溫度;在混凝土中摻加一定量的具有減水、增塑、緩凝等作用的外加劑,改善混凝土拌和物的流動性、保水性,降低水熱化,推遲熱峰出現的時間。
          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,分層、分塊澆筑,以利于散熱,減小約束。
          4. Reasonable arrangement of construction procedures, layered, block pouring, in order to help heat dissipation, reduce constraints.

          5.在大體積混凝土內部設置冷卻管道,通過冷水或冷氣冷卻,減小混凝土的內部溫差;加強混凝土溫度的監控,及時采取冷卻保護措施。
          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.混凝土澆筑后,及時用濕潤的草簾、麻片等覆蓋,并灑水養護,適當延長養護時間,保證混凝土表現緩慢冷卻,在寒冷季節,混凝土兩面必須采取保溫措施,以防寒潮襲擊。
          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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