ACI Committee 305's ACI 305R-10: Guide to Hot Weather Concreting PDF

By ACI Committee 305

ISBN-10: 0870313967

ISBN-13: 9780870313967

Environmental components, resembling excessive ambient temperature, low humidity, excessive wind, or either low humidity and excessive wind, have an effect on concrete homes and the development operations of combining, transporting, and putting of the concrete fabrics. This advisor presents measures that may be taken to reduce the bad results of those environmental components and decrease the potential of critical problems.

This consultant defines scorching climate, discusses capability difficulties, and provides practices meant to lessen them. those practices contain opting for fabrics and proportions, precooling constituents, and batching. different issues mentioned comprise size of haul, attention of concrete temperature as positioned, amenities for dealing with concrete on the website, and, through the early curing interval, putting and curing ideas, and applicable checking out and inspection approaches in scorching climatic conditions. The fabrics, techniques, quality controls measures, and inspections defined during this record can be demonstrated, monitored, or played as acceptable basically via contributors conserving the perfect ACI certifications or similar.

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Absorbed gases are warmed and reradiated in all directions, including back down to the Earth. The temperature in the lower atmosphere is much higher than it would be without this “blanketing” effect. In fact, the greenhouse effect is critical to life on the Earth. The surface is some 54ºF (30ºC) warmer than it would be without it. BRIGHT AND DULL SURFACES When the Sun’s energy reaches the Earth’s surface, some of it is absorbed and some is reflected. The proportion of radiation that is reflected depends on how bright a surface is (known as the surface’s “albedo”).

He published a map of surface winds across the world’s subtropical oceans. He also understood the influence that solar heating patterns have on atmospheric motion, and the way in which the uneven temperature of the Earth’s surface causes warm air to rise, in turn causing air to circulate. THE LAWS OF PHYSICS One of the most important events of the Scientific Revolution was the formulation of the laws of physics, which laid the foundations for the meteorological sciences. Two giants of the Royal Society, a scientific body founded by the English King Charles II in 1662, made advances that were critical to the understanding of atmospheric phenomena: 35 THE SCIENTIFIC REVOLUTION Isaac Newton formulated his Law of Gravitation and Laws of Motion, and Robert Boyle established the mathematical relationship between the pressure, volume, and temperature of a gas.

NORSE ADVENTURERS The Viking king Eric the Red led a small expedition to what is now Greenland in 982 after he had been expelled from Iceland. On the southern tip of the island and up the southwest coast, he discovered land and a climate that were suitable for cultivating crops and keeping livestock, and he returned three years later with a party of settlers to establish two colonies on the island. Conditions were still relatively harsh, with a very short growing season, and Eric may have tricked some settlers into coming with him by exaggerating the fertility of the new land LOST CIVILIZATION The ruined temples of the Mayan city of Tikal lie in the jungle of present-day Guatemala.

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ACI 305R-10: Guide to Hot Weather Concreting by ACI Committee 305

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