33results about How to "Control slump loss" patented technology

The invention discloses a method for synthesizing a polycarboxylic acid type high slump water reducer, which belongs to the field of concrete preparation. The monomer solution and alkali solution, under the triggering of the initiator solution, can promote the reverse generation of the polymerization reaction, which can reduce the cost of raw materials and at the same time optimize the synthesis process, change the traditional initiation conditions, and use the redox system to mainly release heat. Promote the polymerization reaction, and add the oxidant and reducing agent through the self-sustaining device, and at the same time have the function of automatically adjusting the redox reaction according to the ambient temperature, significantly improving the stability and adequacy of the polymerization reaction, and then improving the performance of the finished water reducer , can minimize the water-binder ratio of concrete, and at the same time maximize fluidity, with efficient water reduction, improved concrete pore structure and compactness, and better control of concrete slump loss.

The invention discloses a toughening and corrosion-resistant concrete additive, which is characterized in that it comprises the following raw materials in mass percentage: mineral powder 30-40%, silicon micropowder 30-40%, polypropylene fiber 6-12%, modified furan resin 6‑12%, silane coupling agent 0.1%‑0.2%, p-toluenesulfonic acid 0.1‑0.2%, sodium sulfate 4%‑8%. The invention can significantly improve the toughness and corrosion resistance of concrete through the synergistic effect of silicon micropowder, polypropylene fiber and furan resin, the raw materials are easy to obtain, the preparation process is simple, the construction is simple, and the addition of thermosetting resin can reduce the loss of cementitious materials. consumption, reducing construction costs.

The compound contains water, cement, sand material, flyash. The characteristic is that it also contains compound high-efficiency water-reducing mould-protecting agen, cement is aluminate sulfide cement 500-550, flyash 50-55, water 185-195, compound high-efficiency water-reducing mould-protecting agent 11-15, weight sand ratio of sand material is 38-42 percent. the compound high-efficiency water-reducing mould-protecting agent is composed by naphthalenes high-efficiency water-reducing agent, boric acid and xylon calcium sulphonic acid, weight percentage of each compound are azyl sulfonate high-efficiency water-reducing agent 32-38, nephthalenes high-efficiency water-reducing 37-43, boric acid 12-18, xylon calcium sylphonic acid 7-13.

The invention relates to a concrete water reducer, which is composed of the following raw materials by weight: 10-20 parts of an SC-11 type polycarboxylate superplasticizer, 20-30 parts of a melamineSM superplasticizer, 10-18 parts of a KJ superplasticizer, 4-17 parts of triethanolamine alginate, 6-15 parts of polyglutamic acid, 3-8 parts of sodium tripolyphosphate, 6-18 parts of carboxymethyl chitosan, 3-10 parts of triethanolamine, 2-6 parts of potassium fulvate, 5-14 parts of xanthan gum, 2-5 parts of metolachlor, 1-3 parts of animal hair hydrolysate, 1-3 parts of sodium silicate, 4-12 parts of pentasodium diethylenetriamine pentaacetate and 1-3 parts of dodecenylsuccinic acid diethanolamide. The preparation method of the water reducer includes: mixing the substances, then adding the mixture into a ball mill, performing dry ball milling, then adding the product into an ultrasonic oscillator, and conducting stirring and bagging to obtain a finished product. The water reducer has excellent mud resistance, so that concrete can have high fluidity, small slump loss and high compressive strength.

The invention discloses an early-strength polycarboxylate superplasticizer having a slump-loss prevention function and a preparation method of the polycarboxylate superplasticizer. The polycarboxylate superplasticizer is prepared through the following steps: (I) copolymerizing 5-12% of a monomer a, 73-89% of a modified low-foam early-strength polyether monomer b with the molecular weight (M) in a range of 2000-5000, and 6-15% of a monomer c in an aqueous solution at 50-70 DEG C to obtain a copolymerization reactant, wherein the total amount of the monomer a, the monomer b, and the monomer c is 100% by weight; and (II) adding a pH value conditioning agent into the copolymer for a neutralization reaction, wherein the pH value of the copolymer is adjusted to 6.8-7.2. According to the invention, the early-strength polycarboxylate superplasticizer having a slump-loss prevention function enables the fluidity of cement paste of concrete to be well kept. The concrete is low in air content and short in setting time, and the early-strength of the concrete is significantly enhanced. The polycarboxylate superplasticizer enables the concrete to have certain slump maintenance, and is particularly suitable for production of a prefabricated component of a pile tube or duct piece.

The invention provides a regulator for polycarboxylate pumping agents. The regulator comprises the following components in percentage by weight: 25-45% of sulfate, 10-20% of citrate, 20-25% of phosphate or metaphosphate, 20-25% of polyhydroxy aldehyde, 0.5-2% of solid defoaming agent, 1-5% of cellulose ether and the balance of solid dispersant. The regulator for polycarboxylate pumping agents provided by the invention can effectively inhibit effect of mud content in concrete aggregate on dosage of a polycarboxylate water reducing agent, reduce the doping amount of the polycarboxylate water reducing agent, perfect the concrete workability and maintain the use efficiency of the polycarboxylate water reducing agent.

The present invention relates to a preparation method of environment-protecting type water-reducing agent capable of improving cement concrete performance, belonging to the field of high-molecular polymer and cement concrete functional adjuvant preparation process technology. Said method is characterized by using polyethylene glycol (molecular weight 400-4000), acrylic acid or maleic acid and sodium methyl propyl sulfonate, etc. as main raw material, adopting continuous two-step synthesis method and utilizing the processes of polymerization and esterification reaction so as to obtain the invented polymer high-effective cement concrete water-reducing agent.

The invention discloses a concrete nano water-reducing super high-early-strength agent which is capable of remarkably increasing early and late strength of concrete and shortening construction period and simultaneously has good water-reducing performance, plastic retaining performance, corrosion inhibiting performance and stability. The agent comprises the following ingredients: 46-52 wt% of early strength components, 26-32 wt% of water reducing components, 6-15 wt% of corrosion inhibiting components, 4-5 wt% of retarding components, and 6-8 wt% of adjustment components, wherein the early strength components comprise three or four selected from magnesium sulfate, sodium sulfate, sodium nitrite, triethanolamine, sodium thiosulfate, triisopropanolamine, and calcium formate, the water reducing components comprise one selected from naphthalene sulfonic acid high-efficiency water reducer and carboxylic acid water reducer, the corrosion inhibiting components comprise one selected from calcium nitrite, calcium nitrate, potassium chromate, and stannous chloride, the retarding components comprise one selected from sodium gluconate and citric acid, and the adjustment components comprise nano ground calcium carbonate.