LCA of Mortar with Calcined Clay and Limestone Filler in RC Column Retrofit

Brian E. Bautista, Jason Maximino C. Ongpeng and Luis F. Razon
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Brian E. Bautista: Department of Civil Engineering, De La Salle University, Manila 0922, Philippines
Jason Maximino C. Ongpeng: Department of Civil Engineering, De La Salle University, Manila 0922, Philippines
Luis F. Razon: Department of Chemical Engineering, De La Salle University, Manila 0922, Philippines

Sustainability, 2022, vol. 14, issue 3, 1-26

Abstract: Cement manufacture contributes about 5–7% of the global carbon dioxide emission. The fastest short-term remedy is to replace parts of ordinary Portland cement (OPC) in concrete with supplementary cementitious materials (SCMs) to reduce CO 2 emissions. Calcined clay and limestone filler have proven to be potential substitutes to good quality SCMs such as fly ash and slag because of their abundance, low cost, and potential reactivity to calcium hydroxide to form calcium silicate hydrates (C-S-H) which are responsible for the strength and other mechanical properties of concrete. A life cycle assessment (LCA) to evaluate the environmental impact of mortar with calcined clay and limestone filler in reinforced concrete (RC) column retrofitting is carried out using data from a multi-purpose complex project in Rizal province in the Philippines. A total of four retrofitting methods are evaluated based on two retrofitting techniques (RC column jacketing and steel jacketing) with two material alternatives (pure OPC-based mortar and mortar with partial replacements). Results show that RC column jacketing using patched mortar with partial replacement of calcined clay and limestone fillers is the least environmentally damaging retrofit option. The use of these SCMs resulted in a 4–7% decrease in global warming potential and a 2–4% decrease in fine particulate matter formation. Meanwhile, RC column jacketing decreased the effect on human carcinogenic toxicity by 75% compared to steel jacketing.

Keywords: life cycle assessment; calcined clay; limestone filler; supplementary cementitious material; retrofit; RC column jacketing; steel jacketing (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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