Concrete Products

AUGc2019

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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www.concreteproducts.com August 2019 • 19 -Ϯϯϱ-Ϯϯϱ| ;ϮϬϰ-ϭϭϭϯ| ƐĂůĞƐΛďŅƚĞĐŚĐŽŵ &K'/^/E ² K Ϯ ůŽǁĞƌƐƉ,ĂŶĚŚĞůƉƐƐĞƚƚůĞƐƵƐƉĞŶĚĞĚĐĞŵĞŶƚƐŽůŝĚƐ• ŽŶƚƌŽůLJŽƵƌŚŝŐŚƉ,ǁĂƚĞƌǁŚŝůĞƌƵŶŶŝŶŐLJŽƵƌƌĞĐůĂŝŵĞƌŵŽƌĞĞĨĨŝĐŝĞŶƚůLJ ŽŶƚĂĐƚƚŚĞŽŶĞĐŽŵƉĂŶLJƚŚĂƚƉƌŽǀŝĚĞƐƐŽůƵƚŝŽŶƐĨŽƌLJŽƵƌ ƚǁŽďŝŐŐĞƐƚǁĂƐŚŽƵƚƉƌŽďůĞŵƐ• NEWS SCOPE PRODUCERS "Incorporating the Effect of Carbonation" authors reference the British Standards Institution's "EN 16757 Sustainability of con- struction works" in their concrete carbon modeling. factors affecting the capacity of concrete to absorb carbon dioxide from the atmosphere. A recent Swedish Environmental Research Insti- tute study examines data from several European countries to develop practical models to gauge the extent of CO 2 uptake by concrete in the worldwide built environment. Institute researchers developed several approaches and statistical models of increasing complexity to come up with valid estimates of general CO 2 uptake by concrete. A Tier 1 model provides a simplified approach for use on a national basis relative to the annual emissions associated with cement production in the same year. It has two options for CO 2 uptake calculation. Option A uses the mean value of 20 percent for estimating uptake over the life of concrete structures. Option B uses this mean value minus a standard deviation factor for estimating CO 2 uptake, resulting in a 15 percent projection. The standard deviation adjustments are designed to account for various factors that could affect the rate of carbonation, among them: length of time of exposure to the atmosphere, humidity, concrete porosity, cement type, and water-cement ratios. Many organizations and companies are actively working on mea- sures to reduce greenhouse gas emissions, CalPortland observes. Having a better appreciation of the level of CO 2 uptake by concrete can help the industry in these pursuits. As "Incorporating the Effect of Carbonation in Concrete LCA" and several noted studies clearly show, carbonation in cement-based products represents a substantial carbon sink that is not currently considered in emissions calcula- tions. CalPortland research illustrates how understanding the effects of greenhouse gases associated with the built environment warrants focused studies on CO 2 uptake in concrete within the context of its overall Life Cycle Assessment. Authoring "Incorporating the Effect of Carbonation in Concrete LCA" are CalPortland's William Larson, MBA, vice president, Marketing; Kirk McDonald, vice president, Technical Services; Tina McIntyre, general manager, Marketing and Government Affairs; and, Hartmut Riess, director of Process Engineering.

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