A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
METHOD FOR TREATING CLAY AND CLAY-BEARING AGGREGATES AND COMPOSITIONS THEREFOR
The present invention provides methods for modifying cementitious materials containing clay-bearing aggregates. The methods comprise mixing a carboxylate graft polymer with a cementitious binder and a plurality of clay-bearing aggregates in an amount of 1% to 50% by weight based on dry weight of clay contained in the plurality of aggregates, the carboxylate graft polymer comprising a first component represented by structure (A) and a second component represented by structure (B) in a molar ratio in the range of 0.5 to 1.5 of first component:second component, and having a weight-average molecular weight in the range of 70,000 to 150,000. Such clay-mitigation is particularly useful for treating clay and clay-bearing aggregates, particularly those aggregates used for construction purposes. The present invention minimizes the need to wash the aggregates, thus preserving fine aggregates ("fines") content in construction materials, and thereby beneficiating the performance and/or properties of construction materials containing the clay-bearing aggregates.
La présente invention porte sur des compositions et des procédés consistant en l'utilisation d'un polymère greffé de carboxylate ayant une masse moléculaire élevée et un faible rapport des groupes acides aux groupes polyoxyalkylène. Une telle atténuation des effets de l'argile est particulièrement utile pour le traitement d'argile et d'agrégats argileux, en particulier des agrégats utilisés à des fins de construction. La présente invention réduit au minimum le besoin de laver les agrégats, ce qui préserve ainsi la teneur en agrégats fins (« fines ») dans des matériaux de construction et améliore de cette manière la performance et/ou les propriétés de matériaux de construction contenant les agrégats argileux.
METHOD FOR TREATING CLAY AND CLAY-BEARING AGGREGATES AND COMPOSITIONS THEREFOR
The present invention provides methods for modifying cementitious materials containing clay-bearing aggregates. The methods comprise mixing a carboxylate graft polymer with a cementitious binder and a plurality of clay-bearing aggregates in an amount of 1% to 50% by weight based on dry weight of clay contained in the plurality of aggregates, the carboxylate graft polymer comprising a first component represented by structure (A) and a second component represented by structure (B) in a molar ratio in the range of 0.5 to 1.5 of first component:second component, and having a weight-average molecular weight in the range of 70,000 to 150,000. Such clay-mitigation is particularly useful for treating clay and clay-bearing aggregates, particularly those aggregates used for construction purposes. The present invention minimizes the need to wash the aggregates, thus preserving fine aggregates ("fines") content in construction materials, and thereby beneficiating the performance and/or properties of construction materials containing the clay-bearing aggregates.
La présente invention porte sur des compositions et des procédés consistant en l'utilisation d'un polymère greffé de carboxylate ayant une masse moléculaire élevée et un faible rapport des groupes acides aux groupes polyoxyalkylène. Une telle atténuation des effets de l'argile est particulièrement utile pour le traitement d'argile et d'agrégats argileux, en particulier des agrégats utilisés à des fins de construction. La présente invention réduit au minimum le besoin de laver les agrégats, ce qui préserve ainsi la teneur en agrégats fins (« fines ») dans des matériaux de construction et améliore de cette manière la performance et/ou les propriétés de matériaux de construction contenant les agrégats argileux.
METHOD FOR TREATING CLAY AND CLAY-BEARING AGGREGATES AND COMPOSITIONS THEREFOR
PROCEDE POUR LE TRAITEMENT D'ARGILE ET D'AGREGATS ARGILEUX ET COMPOSITIONS S'Y RAPPORTANT
KUO LAWRENCE (author) / TREGGER NATHAN (author) / LEE HO (author) / KWON O-IL (author)
2020-06-30
Patent
Electronic Resource
English
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