Sustainable ratings systems (e.g., LEED, Envision) as well as government subsidi
ID: 1714183 • Letter: S
Question
Sustainable ratings systems (e.g., LEED, Envision) as well as government subsidies for sustainable construction enjoy the difficult task of trying to quantify the relative worth of efficiency, etc.). From the list below, choose the pavement construction practice that you believe is the most effective at increasing sustainability, as well as the practice that vou believe is the least effective aodmuadkoin at increasing sustainability. Using HMAC ground-up onsite as a part of new HMAC pavement Using soil cement pavement (SCP) instead of HMAC Using WMAC instead of HMAC Using pervious asphalt pavement Using PCC instead of HMAC Using high-albedo (highly reflective) pavement Provided a detailed explanation for each of your choices.Explanation / Answer
1. Using HMAC ground up at the site as new pavement: Hot mix asphalt concrete abbreviated as HMAC is produced by heating the asphalt binder to decrease its viscosity and the moisture from the aggregates before it applied to prepare HMAC. As we have to talk about the sustainability of the pavement so in that view HMAC is 100% recyclable and most widely used materials for the pavement construction around the world, in fact, less than 1% of this pavement is sent to the landfills. according to the materials availability criteria and energy criteria, this pavement needs the high temperature in the batching plant for its productions. so the material is not easily available and needs higher energy.
2. Using soil cement pavement: Mixture of pulverized soil with the cement and water and finally compaction to the high-density pavement with the time leading to hydration of the cement paste.generally used as subbase layer of the pavement these have high compressive strength but are brittle in nature and once used cannot be recycled , in terms of materials availability and the energy requirement these pavement are superior to HMAC type pavements as this used locally available materials.
3. Use of WMAC instead of HMAC: WMAC uses some special chemicals as zeolites, emulsions or maybe water to asphalt binder before producing the mix which helps in decreasing the mixing and laying temperatures, which is one of the shortcomings of the HMAC. so they are superior to WMAC in grounds of sustainability as rest is the same as of WMAC.
4.Use of PCC instead of HMAC: PCC pavement is superior to HMAC if we consider the compressive strength and durability . in terms of environmental sustainability HMAC is superior as they are near to 100% recyclable.
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