By ACI Committee 305
Environmental elements, reminiscent of excessive ambient temperature, low humidity, excessive wind, or either low humidity and excessive wind, impact concrete houses and the development operations of combining, transporting, and putting of the concrete fabrics. This advisor presents measures that may be taken to lessen the bad results of those environmental elements and decrease the possibility of critical problems.
This advisor defines sizzling climate, discusses strength difficulties, and provides practices meant to lessen them. those practices contain deciding upon fabrics and proportions, precooling components, and batching. different subject matters mentioned comprise size of haul, attention of concrete temperature as positioned, amenities for dealing with concrete on the web site, and, in the course of the early curing interval, putting and curing ideas, and acceptable checking out and inspection tactics in scorching climatic conditions. The fabrics, approaches, qc measures, and inspections defined during this rfile can be validated, monitored, or played as acceptable basically via participants preserving the proper ACI certifications or identical.
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Additional info for ACI 305R-10: Guide to Hot Weather Concreting
2 All of the experts who participated completed a form stating that they had no conflicts of interest that would compromise their ability to participate in the panel. Prior to the posting of the questionnaires, we conducted a series of pretests with internal and external experts, including two panel participants. The goals of the pretests were to check that (1) the questions were clear and unambiguous and (2) terminology was used correctly. We made changes to the content and format 2 The responses presented in this report are from the second questionnaire, supplemented with examples and anecdotes from the open-ended responses in the first round, and represent the views of the 18 panelists who participated in both phases of the panel.
S. emissions reduction program would be undercut. S. S. companies to compete with similar companies in other countries, 10 out of 18 panelists said the effect would be negative, 7 said it would be neither positive or negative, and 1 did not know or was not sure. Moreover, several panelists said that energy-intensive industries such as chemicals and metals, as well as the coal sector, would experience the most negative effects if the United States established a price on greenhouse gases in the absence of such actions in other high-emitting nations.
The modified process we employed utilized two Web-based questionnaires, and incorporated an iterative and controlled feedback process to gather the experts’ opinions. Specifically, experts’ responses to the first questionnaire were used to create the questions for the second, allowing the experts to consider the opinions and issues raised by other panelists when responding to the second round of questions. Also, by using a Web-based process, we were able to overcome some of the potential biases associated with group discussions.
ACI 305R-10: Guide to Hot Weather Concreting by ACI Committee 305