Green construction is growing fast. There are companies now that specifically focus on green building materials, where you might find a green cement substitute. Portland Cement offers two green substitutes for cement. There are two alternative substitutes that are most commonly used: Pulverized Fuel Ash and Ground Granulated Blastfurace Slag. Some home improvement stores will carry these alternatives as well. Remember to read the instructions on mixing before you leave the store, because green cement substitutes are mixed differently.
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