n IMIESA - Hot weather concreting : cement & concrete

Volume 41, Issue 6
  • ISSN : 0257-1978
  • Author
  • Source : IMIESA, Volume 41, Issue 6, Jun 2016, p. 53 - 57
  • Accreditation : Department of Higher Education and Training (DHET)



Hot weather any combination of high ambient temperature,low relative humidity, wind speed, solar radiation and, more critically, high concrete temperature. It should also be noted that the effects of high temperature, solar radiation and low relative humidity may be more pronounced with increases in wind velocity (see Figure 1), which can lead to rapid moisture evaporation. This is the primary cause of plastic shrinkage cracks in concrete. Table 1 illustrates the average summer temperatures of selected cities in South Africa. The word "average" needs to be kept in mind as, 50% of the time, temperatures do exceed the average. Then there is climate change. The average of 21 model simulations, when comparing the period 1980-1999 with the period 2080-2099, was that annual temperature will increase by 3.4°C. Already, in 2016, we are experiencing a 0.5°C increase in temperature over and above the temperatures in Table 1. It should be remembered that problems associated with hot weather concreting can occur at any time - e.g. temperatures soar due to heat waves, especially during spring and summer. This could occur during autumn and even winter, especially in South Africa.

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