摘要:
Design optimization methods can be used to design concrete mixtures having optimized properties, including desired strength and slump at minimal cost. The design optimization methods use a computer-implemented process that is able to design and virtually “test” millions of hypothetical concrete compositions using mathematical algorithms that interrelate a number of variables that affect strength, slump, cost and other desired features. The design optimization procedure utilizes a constant K (or K factor) within Feret's strength equation that varies (e.g., logarithmically) with concrete strength for any given set of raw material inputs and processing equipment. That means that the binding efficiency or effectiveness of hydraulic cement increases with increasing concentration so long as the concrete remains optimized. The knowledge of how the K factor varies with binding efficiency and strength is a powerful tool that can be applied in multiple circumstances. A concrete manufacturing process may include accurately measuring the raw materials to minimize variation between predicted and actual strength, as well as carefully controlling water content throughout the manufacturing and delivery process.
摘要:
Laminated articles include a porous and/or moisture-sensitive substrate and a multi-layer laminate coating applied thereto. The substrate includes at least one polymer binder (e.g., a starch, a cellulose ether, a polysaccharide gum, a protein, paper, paperboard, or a molded pulp). The multi-layer laminate coating includes an inner layer oriented toward the substrate and an outer layer oriented away from the substrate. The inner layer comprises at least one soft thermoplastic polymer having a melting or softening temperature that is lower than the melting or softening temperature of at least one hard thermoplastic polymer within the outer layer. Heating the multi-layer laminate causes the inner layer to become softened and adhesive, allowing it to adhere to the molded substrate. The higher melting or softening temperature allows the outer layer to maintain the structural integrity of the multi-layer laminate during the coating process.
摘要:
Design optimization methods can be used to design concrete mixtures having optimized properties, including desired strength and slump at minimal cost. The design optimization methods use a computer-implemented process that is able to design and virtually “test” millions of hypothetical concrete compositions using mathematical algorithms that interrelate a number of variables that affect strength, slump, cost and other desired features. The design optimization procedure utilizes a constant K (or K factor) within Feret's strength equation that varies (e.g., logarithmically) with concrete strength for any given set of raw material inputs and processing equipment. That means that the binding efficiency or effectiveness of hydraulic cement increases with increasing concentration so long as the concrete remains optimized. The knowledge of how the K factor varies with binding efficiency and strength is a powerful tool that can be applied in multiple circumstances. A concrete manufacturing process may include accurately measuring the raw materials to minimize variation between predicted and actual strength, as well as carefully controlling water content throughout the manufacturing and delivery process.
摘要:
A process produces a paste with improved workability. At least 30% by volume of the paste when cured under ASTM conditions crystallizes into monolithic crystals of calcium silicate hydrate exhibiting a unique crystalline structure and having improved compressive strength.
摘要:
A paste with improved workability is formed from at least 20% Portland cement. The paste when cured under ASTM conditions crystallizes into a substantially homogeneous mass of monolithic crystals of calcium silicate hydrate exhibiting a unique crystalline structure and having improved compressive strength.