Often during the concreting process in the construction sites, there is a common concern and complaint of all the parties. The water content in the concrete. One important equation which should be engraved in all the mind before the process is that “Water content is directly proportional to the pumpability/ease of placing of the concrete and inversely proportional to the strength of the concrete”. This is the very reason why the water content is very crucial and should be calculated carefully in the mix design. Although everyone understands the concept of slump, it is generally challenging to track the exact measurement of every batch or every lot of mix. Therefore, following some measures and practices at the time of concreting to maintain a healthy and desired slump is beneficial. Here are some of the important aspects which cover most of the challenges.
Check the water content in the batch slip and judge it according to the convenience of placing and pumping ability. At the beginning when you feel the slump is not according to your necessity, try to change the water content by coordinating with the batching plant team until you get the required slump or visible viscosity. It is imperative that your combination should be cross-checked by the slump cone test at concreting site. Once you achieve the needed slump, all you have to do is keep an eye on the water content in every batch slip and maintain its unanimity throughout the process.
In the sites where batching is done manually or by small millers, the quantity of water should be calculated and should be maintained every-time.
Monitoring Pumping & Placing Teams:
Many times the labor teams who deal with the pumping and placing process are taken on lumpsum basis. So often they mind their comfort and try to add water in the concrete so that the process becomes fast and easy yet diminishing the concrete quality. To avoid this, it is advisable to deploy a dedicated engineer to mind the water content while pumping the concrete. Generally, this water is mixed near the location of pump or transit mixer. The appointed engineer would be more productive of he has a good knowledge about the water levers and hoses inside the transit mixer and the pump.
Not just pushing the blame on the teams over there, proper care should be given to the people by minding their working times, their food and climatic conditions. Because concreting will be done for several hours continuously, there is no surprise that the labor will fall tired and opt for easy methods. So proper human resource management should be undertaken.