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This is more rare but, originates from such concrete-making materials as hydraulic cements, fly ash, aggregate, and admixtures.Portland cement might be over-sulphated.Presence of natural gypsum in the aggregate.Admixtures also can contain small amounts of sulphates.External sources.
We are an innovative enterprise integrating R & D, production, sales and after-sales service. We have more than 60 years of experience in the field of crushing, beneficiation, sand making and building materials. We serve customers in more than 160 countries around the world.