Ahmadiah Construction July 09 www. bus- ex. com 27 nearby, maybe a river, and this is Kuwait." After doing some research, the team decided to change the concrete mix radically, replacing a big percentage of the cement with fly ash and microsilica, both very fine by-products of combustion. These particles make the concrete stronger, more durable and more resistant to chemical attack. They require less water and take longer to hydrate than cement, so in this case the plan was to spread the temperature rise and reduce the peak.