Abstract
The combination of hot weather typical factors, such as high temperature and low relative humidity of the air, associated with the delay in concrete application due to lack of planning in concreting, are some causes of slump loss in this material. Depending on the type of work and the adopted execution methods, this loss may make both placement and compaction more difficult. Thus, consistency correction through water addition or other plasticizer additives are common. In this context, this research aimed to analyze the variations of slump loss in concrete through time and the consequences of water addition in the mixture. Therefore, it was performed a study with trace of characteristic resistance to compression correspondent to 35 MPa, analyzing 70 test specimens in a total of seven subsequent periods, from 0 min (after preparation) and 180 min. The specimens were molded according to ABNT NBR 5738 (2015) Brazilian standard and submitted to compression test after 28 days being cured, according to ABNT NBR 5739 (2018) Brazilian standard. Results showed that after 180 min, water addition caused a 68,60% increase in water to cement ratio and a 59,20% loss of resistance to compression. In summary, water addition to slump correction was observed to be an extremely harmful practice to concrete and it should be avoided or minimized.
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