33results about How to "Strong retardation" patented technology

The invention belongs to the technical fields of chemical industry and concrete construction materials. In order to solve the problems of high slump constant time loss and lower flowability in the concrete, the invention provides a preparation method of starch sulfonate. The preparation method comprises the following steps: dissolving dextrin prepared from starch or directly purchased dextrin in water, heating to react by using water as a dispersing agent and sodium bisulfite as a sulfonating agent, and regulating the pH value to 7 with sodium hydroxide to obtain a liquid which is the starch sulfonate. The invention uses the method for preparing starch sulfonate by using water as the medium and sodium bisulfite as the sulfonating agent for the first time, which is different from the preparation method by using dichloromethane or any other organic solvent as the medium in the prior art. The method has the advantages of simple technique, environment friendliness and no pollution emission, and is beneficial to industrial production. The product has favorable synergic dispersion properties for cement particles, solves the problems of poor slump retaining effect and poor workability in the existing retarder for concrete, use of toxic solvents in the preparation process, and difficulty in treating sulfonating agent byproduct chlorine ions. The invention provides a novel preparation method of starch sulfonate.

The invention belongs to the technical field of building materials, in particular to a concrete retarder and a preparation method thereof. The concrete retarder is made of the following raw materials: 3-6 parts of modified microcrystalline cellulose, 1-3 parts of acrylic acid, 8-12 parts of modified glass fiber, 5-10 parts of borax, 6-10 parts of poly Vinyl chloride resin, 2-4 parts of anhydrous sodium sulfate, 3-5 parts of quartz sand, 8-12 parts of sodium tripolyphosphate, 1-3 parts of carboxymethyl cellulose. The concrete retarder provided by the invention has good heat absorption and heat dissipation properties, can absorb the heat of hydration generated by concrete; and make the concrete form a good heat exchange effect with the external environment, so that the heat of hydration generated in the concrete can be dissipated ; And inhibit the hydration of cement in concrete, has a strong retarding effect; at the same time has good strength, less impact on the strength and anti-scouring performance of concrete.

The invention discloses a phosphorus slag based environmentally-friendly building material and a preparation method thereof. The phosphorus slag based environmentally-friendly building material comprises the following components in parts by mass: 14.61 to 44.08 parts of phosphorus slag powder, 1.11 to 18.72 parts of building waste residue powder, 1.11 to 6.24 parts of sialic sphere powder, 1.11 to3.12 parts of nanometer silex, 2.10 to 8.46 parts of an alkaline activator, 20.81 to 66.51 parts of sand, 11.08 to 16.53 parts of water and 0.22 to 1.17 parts of an efficient polycarboxylate superplasticizer. The phosphorus slag based environmentally-friendly building material is low in cost, simple in preparation technology and short in maintenance time.

The invention discloses a grouting compound and a performance parameter detection method thereof. The grouting compound comprises the following components in parts by weight: 500-1500 parts of cement,500-3000 parts of aggregate, 10-150 parts of an admixture, 5-150 parts of rubber powder, 1-20 parts of a high-efficiency water-reducing agent, 1-10 parts of an anti-cracking capsule, 0.1-5 parts of adefoaming agent, 0.02-2 parts of a plastic expanding agent, 20-150 parts of a hardening expanding agent, 0.5-10 parts of an early strength agent, 0.5-5 parts of a slump retaining agent and 0.5-5 parts of fiber, wherein mixing water is 0.10-0.35 times of powder. Through a matching ratio, the grouting compound has very high early strength and superstrong coagulation retardation, has 90min fluiditybeing better than the discharge flow performance of the conventional grouting material, and can fully densify and infiltrate a concrete interface; in addition, because of good bonding performance, a circumferential construction joint constructed on a previous slab and an open end of the previous slab are repaired better to obtain overall bonding strength, so that mechanical properties of a liningare greatly improved; the defects that when the conventional grouting material is used for repairing, an original base surface is required to be chiseled and be brushed with an interface agent are overcome, and a concrete structure can be directly repaired.