Venture capital-backed Brimstone, Oakland, Calif. developer of a portland cement alternative processed from calcium silicate rock, reports third-party certification that its product meets or exceeds ASTM C150, Standard Specification for Portland Cement. Results from tests by Twining Consulting, Irvine, Calif. indicate a concrete binder identical in all respects—performance, safety and composition—to ordinary portland cement milled through conventional, carbon-intensive methods. “We…
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