43results about How to "Improve plastic retention" patented technology

The invention discloses a polycarboxylate water reducer modified by a silane coupling agent and a preparation method thereof. It belongs to the field of cement additives. Add a certain amount of acrylic acid to the polyether macromonomer solution, stir evenly, then add a silane coupling agent containing a double bond, the stirred solution is clear, continue to stir; continue to keep stirring, add oxidant, initiator solution and small Monomer solution; after stirring and aging for 1-2 hours, add liquid caustic soda to neutralize, stabilize the pH value at 6, and then add a silane coupling agent without double bonds to obtain a silane coupling agent-modified polycarboxylate superplasticizer finished product. The synthesis of the present invention introduces a functional group containing a siloxane structure into the main chain of the polycarboxylic acid molecule to provide an anchoring ability for the branched chain of the comb-shaped polycarboxylate superplasticizer to chemically bond and strongly interact with the gelling material particles , the increase of the anchoring capacity can significantly enhance the adaptability and slump retention of the water reducer, and expand the use of the water reducer in the field of mineral powder dispersion to a certain extent.

The invention discloses a ready-mixed permeable concrete and its preparation method and application, belonging to the technical field of building material concrete. The ready-mixed permeable concrete of the present invention comprises cement, coarse aggregate, silica fume, polymer emulsion, special plastic retainer, polycarboxylate water reducer and water, wherein the special plastic retainer is macromonomer ethylene glycol monoethylene Polyethylene glycol ether, ethyl acrylate, sodium allyl sulfonate and hydroxyalkyl acrylate are unsaturated monomers, benzoyl peroxide is used as an initiator, and 3‑mercaptopropionic acid is used as a chain transfer agent to compound made. Adoption of the technical scheme of the invention can not only meet the large-scale application requirements of the permeable concrete market, but also effectively ensure the performance of the ready-mixed permeable concrete, thereby ensuring the stability of engineering construction quality.

The invention relates to a preparation method of a naphthalene-series water reducing agent. The method comprises the following steps: (1) methylnaphthalene and phenol are separately sulfonated, such that a sulfonated methylnaphthalene material and a p-hydroxybenzenesulfonic acid material are obtained; (2) the sulfonated methylnaphthalene material is subjected to a hydrolysis reaction; un-reacted methylnaphthalene or homologs thereof are removed through zeotropy; the rest of the sulfonated methylnaphthalene material enters a reaction in the step (3); (3) the sulfonated methylnaphthalene material obtained in the step (2) and the p-hydroxybenzenesulfonic acid material obtained in the step (1) are subjected to a condensation reaction with formaldehyde acidified with concentrated sulfuric acid, such that a condensed material is obtained; and (4) alkali liquid is added into the condensed material obtained in the step (3), such that a neutralization reaction is carried out, until the pH value is 7.5-9; and the naphthalene-series water reducing agent is obtained when the reaction is finished. The naphthalene-series water reducing agent provided by the invention has the excellent performances of good adaptability to cement, good concrete workability, high plasticity-maintaining performance, low concrete gradual loss, high water reducing rate, and the like. The preparation method has the advantages of simple process and easy-to-control reaction conditions. With the method, naphthalene-series water reducing agent production cost can be reduced.

The invention relates to a method for producing multifunctional concrete from household garbage power generation waste residues, and belongs to the technical field of novel concrete materials and environmental engineering. The method comprises the following steps: mixing the household garbage power generation waste residues with natural sand to obtain mixed sand; mixing the household garbage power-generation waste residues with the grain sizes greater than 5 mm with crushed stones to obtain mixed crushed stones; mixing natural zeolite powder with brucite fibers to prepare a thickening early-strengthening anti-cracking self-curing agent; mixing a polycarboxylate superplasticizer with ultrafine mineral powder to obtain a liquid water-reducing plasticity-maintaining agent; weighing cement, coal ash, silicon powder, mineral powder, the thickening early-strengthening anti-cracking self-curing agent and the mixed crushed stones in a mass ratio, and pouring into a stirrer successively for uniformly stirring to obtain the multifunctional concrete. The concrete prepared by the method has characteristics of self-compaction, self-curing, low hydration heat, low shrinkage, high durability and high plasticity retention property and can be applied to architectural engineering, civil engineering, traffic engineering, city construction engineering and the like. The method has very high economic and social benefits.

The invention discloses an anti-impact and wear-resistant mortar, belonging to the field of a repairing material in water-power engineering. The difficulty that the constructions in the conventional water-power engineering is difficult to repair after being damaged by rushing and abrading with water with sands and stones can be solved. The anti-impact and wear-resistant mortar comprises the following components in parts by weight: 39-48 parts of silicate cement, 45-50 parts of graded hard fine aggregate, 0.05-0.25 parts of water reducing agent, 0.05-0.3 parts of de-foaming agent and 0.05-1.5 parts of nanometer material. The anti-impact and wear-resistant mortar provided by the invention has the advantages of high anti-impact and wear-resistant strength, low elasticity modulus and good anti-crack property, and is a finished product material with a higher application value for repairing through irrigation works.

The invention relates to a method for grouting and strengthening thin-walled structures in buildings to control cracking, and is mainly divided into four parts: formwork construction, crack-resistant grouting material preparation, grouting material pouring and quality control. Compared with the existing technology, in the case of vibration-free construction, the cracking of the reinforcement material is avoided to ensure the safety of the structure. After adding active admixtures, fibers, aggregates and other components to the grouting material, the material is crack-resistant The durability is greatly improved, and the cost of materials can be significantly reduced. The use of permeable template cloth for maintenance construction can significantly reduce the risk of cracking caused by drying shrinkage of grouting materials, and can also significantly improve the appearance quality of reinforced components.

The invention relates to a method for utilizing domestic garbage power generation fly ash and slag and waste glass abrasive powder as main raw materials to fire ceramsite. According to the method, heavy metal elements in the ash is cured by high-temperature firing; the heavy metal elements are sprayed on the surface of ceramsite by a hydrophobic emulsion, so that ceramsite holes are sealed, the surface is hydrophobic, and outward diffusion and permeation of residual heavy metal elements are prevented; when the ceramiste is utilized to prepare multifunctional concrete, the ceramsite is furtherwrapped by cement mortar. Detection of an environmental protection department shows that the heavy metal content in the cement mortar can meet a three-level soil quality requirement in GB15618-1995 and meet a HJ / T298-2007 hazardous waste identification technique requirement; heavy metal elements in domestic garbage power generation fly ash and slag become harmless; the multifunctional concrete produced from the ceramsite can be applied to the related fields of construction; the domestic garbage power generation fly ash and slag become useful resources.