Sustainability Design and Control of Concrete Mixtures – Chapter 2.

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Presentation transcript:

Sustainability Design and Control of Concrete Mixtures – Chapter 2

Overview Introduction to Sustainability Ratings Systems Concrete Sustainability Life-Cycle Analysis

What is Sustainability? “Meeting the needs of the present generation without compromising the ability of future generations to meet their needs.”

Sustainability Aspects Energy conservation and atmosphere Water management and resources Site selection and development Indoor environmental quality Material quality and resources Functional resilience

Ratings Systems

Concrete Sustainability Durability Safety Disaster Resistance Energy Performance Indoor Air Quality Acoustics Stormwater Management Site Remediation Recycling Locally Produced Carbon Dioxide Sink Concrete Ingredients and Sustainability

Durability Ability to resist weathering action, chemical attack, and abrasion while maintaining desired engineering properties Longevity Pantheon in Rome (AD 125)

Disaster Resistance Tornado, Hurricane, and Wind Resistance Fire Resistance Earthquake Resistance Blast Resistance

Energy Performance Thermal Mass Fuel Consumption Heat-Island Reduction Lighting Efficiency

Thermal Mass (CAC 2007).

Fuel Consumption 1% to 11% improvement for heavy trucks 3% to 17% improvement for smaller vehicles

Heat-Island Reduction (Berdahl and Bretz 1994; Pomerantz, Pon, and Akbari 2000; Levinson and Akbari 2001; and Pomerantz and others 2002)

Indoor Air Quality

Acoustics STC of 44 to 58 plain STC up to 63 dressed Highway sound barriers Textured pavement

Stormwater Management

Permeable Grid Paver Systems

Green Roofs

Rainwater Catchment Systems

Site Remediation Brownfields Solidification/stabilization Radioactive waste

Recycling

Recycled Concrete Aggregate

Recycled Materials Post-consumer Crushed concrete and masonry Pre-consumer (industrial by-products) Fly ash, slag cement, silica fume Air-cooled slag aggregate Alternative fuels

Locally Produced Abundant raw materials Usually manufactured within 500 km (300 miles) Ready mixed concrete within 150 km (100 miles) Precast concrete within 300 km (200 miles)

Carbon Dioxide Sink Concrete absorbs carbon dioxide - carbonation Higher surface area increases absorption Over 100 years, 57% of calcination is absorbed

Concrete Ingredients and Sustainability Cement – 7-15% of concrete material Recycled raw materials Alternate fuels Supplementary cementitious material Aggregate – 60-75% of concrete material Recycled concrete aggregate Air-cooled slag

Life-Cycle Analysis Life-Cycle Cost Analysis

Life Cycle Assessment and Inventory

LCA - Pavements

LCA - Buildings

LCA at the MIT Concrete Sustainability Hub

Summary Introduction to Sustainability Ratings Systems Concrete Sustainability Life-Cycle Analysis

Questions