Of these, silica fume is the most reactive, with metakaolin being close to silica fume in terms of reactivity. Fly ash is less reactive, especially during the first few days of curing when less calcium hydroxide is generated. Generally the finer the pozzolan particles are, the more reactive they are. Silica fume is the finest with most particles averaging 0.3 Âµm (microns), metakaolin averages about 4 Âµm, Portland cement averages about 15 Âµm, and fly ash about 70 Âµm. Many pozzolans are waste products from industrial processes.
The most recent Rookie of the Year winner is Karl-Anthony Towns. Twenty-one winners were drafted first overall. Fourteen winners have also won the NBA Most Valuable Player (MVP) award in their careers; Wilt Chamberlain and Wes Unseld earning both honors the same season.
Jordan and O'Neal are the only players to win the award in three consecutive seasons (Jordan accomplished the feat on two separate occasions). Johnson is the only rookie ever to win the award, as well as the youngest at 20 years old. Andre Iguodala is the only winner to have not started every game in the series. Jerry West, the first ever awardee, is the only person to win the award while being on the losing team in the NBA Finals. Willis Reed, Kareem Abdul-Jabbar, Larry Bird, Hakeem Olajuwon, Kobe Bryant, and LeBron James won the award twice. Olajuwon, Bryant, and James have won the award in two consecutive seasons.