A New Mexico company plans to manufacture an environmentally friendly concrete long popular in Europe and Asia but relatively unknown in the U.S. Aercrete LLC of Santa Fe is building a $21 million plant to make autoclaved aerated concrete, a lightweight alternative with insulating properties that cuts buildings' energy use by 30% to 40%. Only two other plants in the U.S. manufacture AAC, which is less expensive than building materials such as wood, brick or steel and also is fully recyclable.

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