University:
University of Houston
Course:
ARCH 4354 | Ideas and Buildings
Academic year:

2024
Views:

419

Pages:

8
Author:

Corey Garrison

THE SECRET ROMAN RECIPE How was this possible? Because the volcano Vesuvio had already heated the pozzolan for them! the pozzolan was calcined by the volcano, enabling it to chemically react with calcium hydroxide in slaked lime, no heating required. Using pozzolan in such high concentrations, pozzolan can decrease concrete porosity, create greater long-term strength, and help to reduce the deleterious effects of alkali aggregate reaction and sulfate attack. THE SECRET ROMAN RECIPE Volcano Vesuvio THE SECRET ROMAN RECIPE Other “secrets” • Rigid quality control, • Low water to cementitious materials ratio, and • Expert placement and compaction. • the Romans had no knowledge of present-day chemistry, • they nonetheless knew how to distinguish a good quality lime and other concrete ingredients through empirical observation • Vitruvius “We must be careful that it [lime] be burned from stone which, whether soft or hard, is in any case white, and lime made of close-grained stone of the harder sort will be good in structural parts; lime of porous stone, in stucco.” THE SECRET ROMAN RECIPE Other “secrets” • Low water to cementitious materials ratio and compaction • Roman mortar was comparable to a modern-day zero-slump concrete like • RCC: so stiff and firm that it would not flow into the spaces between the rocks in the aggregate. • The Romans even used a special tool called a beetle to tamp it and pound it into place. The Romans also used wooden casting forms, BUILDINGS COLOSSEUM BUILDINGS Pantheon TRIUMPHAL ARCH BRIDGES

Roman Concrete 2

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