A company founded by Ginger Krieg Dosier manufactures a precursor to this material biologically via MICP by Sporosarcina pasteurii. This material is packed in an Abrams cone, which is then removed before measuring a resultant height difference, in its namesake “slump test.” Fly ash is often repurposed to manufacture this highly alkaline material, in which the alkali–silica reaction may create a swellable gel. Eight percent of global CO2 emissions come from heating limestone (10[1])and (10[1])aluminosilicates (10[1])in kilns to 1450 degrees Celsius to make one component of this material named for Portland, England. To reduce cracking in this material, rebar is often “pre-tensioned” before embedding. For 10 points, steel is used to strengthen the “reinforced” form of what building material made by combining sand and gravel with cement? ■END■