58results about How to "Reduced hydration" patented technology

The invention provides a polycarboxylate water reducer containing modified water-soluble acrylate and a preparation method thereof. The preparation method comprises the following steps: firstly, directly carrying out esterification reaction on polyhydroxy-alcohol carbohydrates and crylic acid so as to prepare modified water-soluble acrylate micromonomers; then putting polyether macromonomers into deionized water, and fully dissolving so as to prepare a reaction base solution; dissolving the acrylate micromonomers, crylic acid, an initiator vitamin C and a chain transfer agent mercaptoacetic acid into deionized water, so as to prepare drop concentrate; putting an initiator hydrogen peroxide into the reaction base solution, dropwise adding the drop concentrate into the reaction base solution at a constant speed, reacting while stirring, then regulating the pH value of the solution to be 7-8, so as to prepare the polycarboxylate water reducer. According to the preparation method, the regulating function of the polyhydroxy-alcohol carbohydrates is directly used in the water reducer, so that the property of the water reducer is optimized; the polycarboxylate water reducer prepared by the method has high water reducing rate, and the concrete is obviously improved in fluidity retainability and has less slump loss, so that the water reducer can meet higher construction requirements.

The invention discloses an exposed stone concrete and a construction method thereof, and relates to the technical field of concrete construction; an exposed stone concrete is made of exposed stone concrete raw materials containing the following parts by weight: 250-300 parts of cement and 1100 parts of coarse aggregate ‑1200 parts, 750‑850 parts of fine aggregate, 80‑120 parts of mineral powder, 8‑12 parts of water reducer, 140‑180 parts of water; the exposed stone concrete raw material also includes exposed stone agent; the exposed stone agent It is made of dew stone agent raw materials containing the following parts by weight: 0.04-0.08 parts of glucose, 0.025-0.045 parts of sodium hexametaphosphate, 0.001-0.005 parts of amantadine hydrochloride, and 0.35-0.45 parts of dissolved water; it has good retarding effect And the advantages of good environmental protection performance; the construction method of exposed stone concrete includes the following steps: preparation of exposed stone agent, concrete preparation, pavement pouring, road surface maintenance, etc.; the construction method of exposed stone concrete has the advantage of being convenient to improve the retarding effect of the product.

The invention relates to a modified calcium oxide expanding clinker as well as a preparation method and application thereof. The preparation method of the modified calcium oxide expanding clinker comprises the following steps: forming a dense calcium sulfate layer on the surface of an expanding clinker through reaction between sulfur dioxide gases or sulfuric acid and the calcium oxide expanding clinker, thus preparing the modified calcium oxide expanding clinker. The modified calcium oxide expanding clinker can be mixed with a dispersion supporter, thus forming a modified calcium oxide concrete expansive agent. The sulfated packing modified calcium oxide expanding clinker prepared by the preparation method and the expansive agent thereof have the beneficial effects that the expansion quantity and expansion stress of the expanding material in cement concrete are obviously increased, thus optimizing the expansion processes of the expanding clinker and the expansive agent thereof; the weather resistance and moisture resistance of the calcium oxide expanding clinker and the expansive agent thereof are improved.