Scientists strengthen concrete by 30 percent with used coffee grounds

Humans produce around 4.4 billion tons of concrete every year. That process consumes around 8 billion tons of sand (out of the 40-50 billion tons in total used annually) which has, in part, led to acute shortages of the building commodity in recent years. At the same time, we generate about 10 billion kilograms of used coffee grounds over the same span — coffee grounds which a team of researchers