Autumn and winter alternates, how to pass the“Sensitive period” of the agitator truck

  Concrete in the construction process needs many kinds of additives, such as: aerating agent, Water Reducer, Superplasticizer, retarder, pumping agent. If the use of additives is not reasonable, especially in the winter, the requirements of the outside world is gradually rising, once careless, it is likely to lead to a variety of problems pump.

  Therefore, the selection of admixture in the winter construction of concrete pump truck should consider: improving the workability of concrete or mortar, reducing water consumption, improving the quality of mixture, improving the early strength of concrete, reducing the freezing point of mixture, to accelerate the hydration of cement at low or negative temperature, to promote the growth of early and middle strength, to reduce the dry shrinkage, to improve the freeze-thaw resistance, to improve the turnover speed of formwork and to shorten the construction period while ensuring the quality, when choosing admixture, we should pay attention to its influence on the strength of concrete in later period, the corrosion of steel bar and the influence on environment, such as concrete admixture containing ammonia Winter construction as far as possible do not use less hydration heat of slag cement.

  The pipe of pumping concrete by boom pump truck is wrapped with heat-insulating material to ensure that there should not be surface freezing, concrete segregation, loss of cement mortar, slump loss, etc. . Ensure that the concrete cooling speed during transportation shall not exceed 5 ° C/H, ensure that the concrete molding temperature shall not be less than 5 ° C. The use of frozen concrete is strictly prohibited. When it snows, tie up the rebar and cover the part of the rebar with plastic cloth to reduce the difficulty of snow collection. Before pouring concrete, clean the ice and snow on the formwork in time. Do a good job of preparation, improve the speed of concrete pouring. The fire-retardant grass curtain is wrapped on the concrete pump hopper and pump pipe.