58results about How to "Good effect of entraining air" patented technology

The invention provides a composite concrete air-entraining agent, its preparation method and its application, characterized in that: the composite concrete air-entraining agent consists of sulfonate type gemini surfactant, betaine type amphoteric surfactant, alkane Alcohol amide type non-ionic surfactant and water; the solid content of the composite concrete air-entraining agent is 20±1%. The composite concrete air-entraining agent of the present invention has an excellent air-entraining effect in concrete, introduces a sufficient amount of 20-150 μm stable micro-bubbles, improves the workability of concrete (mortar), reduces bleeding rate and settlement, and While increasing the air content, it does not reduce the later strength of concrete.

The invention provides a preparation method of a polycarboxylic acid water reducing agent containing a phosphate group. The preparation method comprises the following steps: firstly, preparing a terminal alkenyl unsaturated phosphonic acid monomer; secondly, mixing acrylic acid, the unsaturated phosphonic acid monomer, a chain transferring agent and de-ionized water to prepare a mixed monomer solution; by taking an alkenyl polyoxyethylene ether macro-monomer solution as a base material, dropwise adding an initiator water solution and the mixed monomer solution respectively under a room-temperature polymerization condition; uniformly stirring, dropwise adding and reacting; and finally neutralizing with a sodium hydroxide solution to obtain the polycarboxylic acid water reducing agent. According to the water reducing agent, the terminal alkenyl unsaturated phosphonic acid monomer is introduced into a structure and primary adsorption is facilitated; the initial dispersity is improved, and hydration and agglomeration of cement are delayed; the slump retaining property is effectively improved and the sensitivity to concrete is reduced; and the stress resistance and adaptability on different aggregate are enhanced.

The invention discloses a channel side slope cast in situ concrete composite additive, and a preparation method thereof. The channel side slope cast in situ concrete composite additive comprises, by weight, 25 to 50 parts of a water reducing agent, 1 to 5 parts of an air entraining agent, 5 to 15 parts of a thickening agent, 4 to 20 parts of an early strength agent, and 20 to 60 parts of water. The channel side slope cast in situ concrete composite additive obvious water reducing effect, air entraining effect, thickening effect, and early strength effect, is capable of increasing strength, compactibility, impermeability, and crack resistance of channel side slope concrete greatly, improving construction quality, and prolonging project service life. According to application processes of the channel side slope cast in situ concrete composite additive in channel side slope cast in situ concrete, the admixing amount of the channel side slope cast in situ concrete composite additive only accounts for 0.5 to 1.5% of the total mass of cement in the concrete; cost is relatively low; economic benefit is excellent; and the channel side slope cast in situ concrete composite additive is suitable for large-scale popularization.

The invention provides a foam control agent and an air-entraining water reducing compounding agent and concrete prepared thereof. The foam control agent is mainly formed by compounding the following components by weight: 5-40% of an alkynol wetting agent E20, 40-70% of an alkynol wetting agent E40, 20-50% of an alkynol wetting agent E65, and the balance other accessories. The foam control agent has double technical effects of air entraining and foam control, can control the foam density and the foam size of a system, makes foams more uniform, eliminates big harmful foams, and makes the cement strength, stability and other properties improved.

The invention discloses bare concrete. The bare concrete is characterized by being prepared from, by weight, 5-10 parts of surface modified nano-boron fiber, 5-10 parts of kaolin, 10-15 parts of illite powder, 20-30 parts of gravel, 5-10 parts of vermiculite sand, 20-30 parts of silver sand, 40-50 parts of Portland cement, 1-5 parts of a compound additive and 20-30 parts of water. The compound additive comprises, by weight, 20-25 parts of a phosphate borate copolymer, 2-5 parts of zinc citrate, 1-3 parts of pyrophyllite powder, 1-3 parts of wollastonite powder, 2-4 parts of porous magnesium silicate, 0.5-1 part of a defoaming agent, 0.8-1.5 parts of polyaminopropyl biguanide, 0.5-2 parts of hydroxypropyl cyclodextrin, 1-3 parts of an activator and 80-100 parts of water. The invention further discloses a preparation method of the bare concrete. The bare concrete is high in compressive strength, good in corrosion resistance, impermeability and crack resistance and excellent in comprehensive performance, and production and application are safe and environmentally friendly.

The invention discloses a concrete air entraining agent molecule with a sulfate ion as a hydrophilic group and reactable alkoxysilane-modified aliphatic hydrocarbon as a hydrophobic part. The concrete air entraining agent molecule is prepared according to a molecular designing principle and has a structure shown in the formula (I). The invention also provides a preparation method of the above compound and a use of the compound as a concrete air entraining agent. The compound has surface activity and in-situ reactivity. The concrete air entraining agent has good air entraining effects at a low mixing ratio, reasonable entrained bubble size distribution, good foam stabilizing effects, high gas content and small influence on concrete strength.

The invention relates to a building material. The invention aims to provide a dry-mixed mortar thickening agent and a preparation method thereof. The dry-mixed mortar thickening agent provided by theinvention has the characteristics of the low cost, the good water reducing effect, the good retarding effect and low air entraining. The preparation method provided by the invention has the characteristics of the simple process and convenience in preparation. According to the technical scheme, the dry-mixed mortar thickening agent is characterized by comprising the following components in parts bymass: 40-60 parts of a thickening agent base material A, 35-55 parts of a thickening agent base material B, 0-5 parts of hydroxymethyl cellulose, and 2-5 parts of sodium hydroxide and 5-10 parts of zeolite powder, wherein the thickening agent base material A comprises maltodextrin, polyethylene glycol and molasses in a mass ratio of (1-2):(2-4):(6-10), and the thickening agent base material B comprises carbonyl pyroaldehyde and sodium lignin sulfonate in a mass ratio of (25-30):(1-5).

The invention relates to a secondary concrete fluidizing agent which mainly solves the technical problem of providing a secondary concrete fluidizing agent. The secondary concrete fluidizing agent comprises the following ingredients in parts by weight: 300-350 parts of a polycarboxylate-type water reducing agent, 0.08-0.10 part of an air-entraining agent, 12-16 parts of a retarder and 630-660 parts of water. A method for preparing the secondary concrete fluidizing agent mainly comprises the following steps: evenly mixing the polycarboxylate-type water reducing agent with water, sequentially adding the air-entraining agent and the retarder, and evenly stirring to obtain the secondary concrete fluidizing agent. The secondary concrete fluidizing agent is fluid, has the functions of ensuring that the secondarily fluidized concrete is small in strength loss, normal in setting time, small in secondary slump loss and the like, and also solves the quality fluctuation problem of the secondarily fluidized concrete.

The invention discloses a modified polyether macromonomer as well as a preparation method and a use method thereof, and belongs to the technical field of water reducers. The modified polyether macromonomer is prepared from the following components in parts by weight: 100 parts of polyether macromonomer, 0.1-0.3 part of tributyl phosphate, 0.1-0.3 part of polydimethylsiloxane, 0-0.2 part of polyoxyethylene polyoxypropylene pentaerythritol ether, 0.01-0.05 part of polyoxyethylene polyoxypropylene alcohol amine ether, 0.01-0.05 part of polyoxyethylene polyoxypropylene glycerol ether, 0.05-0.25 part of sodium dodecyl sulfate, 0.05-0.25 part of triterpenoid saponin, 0-1 part of fumaric acid, 0-1 part of itaconic acid and 1-2 parts of citric acid. The technical problems of high air content, reduced strength, poor durability and the like in concrete after the polycarboxylic acid water reducer is used are solved.

The invention belongs to the field of concrete additives, and concretely relates to an air entrainment-controllable polycarboxylic water reducer used for purely machine-made sand concrete, and a preparation method thereof. The preparation method comprises the following steps: carrying out an esterification reaction on an alkylphenol polyoxyethylene monomer and an unsaturated carboxylic acid to generate an unsaturated carboxylic acid-alkylphenol polyoxyethylene esterification product monomer, carrying out an aqueous solution copolymerization reaction on the unsaturated carboxylic acid-alkylphenol polyoxyethylene esterification product monomer, an unsaturated polyether monomer and an unsaturated sulfonic acid monomer through an oxidation-reduction initiation system, and adding a proper amount of a molecular weight control agent to control the molecular weight in order to obtain the air entrainment-controllable polycarboxylic water reducer. The water reducer prepared in the invention has the advantages of high water reduction rate, good adaptability, small bubble diameters, stable sealing property and controllable air entrainment when applied to the purely machine-made sand concrete, and well solves the problems of difficult air entrainment, poor bubble stability and large concrete pumping loss of the purely machine-made sand concrete.

The invention discloses a high-efficiency concrete water-reducing agent, which is prepared from the following raw materials in parts by weight: 80-90 parts of polycarboxylate water-reducing agent, 0.16-0.18 parts of defoaming agent, 1-1.2 parts of viscosity regulator, modified 0.8-0.9 parts of lignin; the invention also discloses a preparation method of the high-efficiency concrete water-reducing agent. The present invention uses the self-made polycarboxylate water-reducing agent as the main substance, and the hydrophilic groups carboxyl (-COO-), amino (-NH) contained in the self-made polycarboxylate water-reducing agent 2 ), hydrophobic group ester group (‑COOR) and the synergistic effect of polyether side chains are beneficial to its wetting and adsorption on the surface of concrete and concrete particles and the relative lubrication between aggregate particles; through defoamer and modified wood Quantitative addition of the element can lead to proper amount of air entrainment in the concrete, improve the workability of the concrete and reduce the viscosity of the concrete, and has a certain slump retention performance for the concrete. Workable concrete water reducer.