897results about How to "Increase late strength" patented technology

The invention relates to a cement grinding aid, in particular to a cement grinding aid and a preparation method thereof. The cement grinding aid is prepared from, by weight, 13-18 parts of polymeric polylol, 8-12 parts of tri-isopropanolamine, 12-15 parts of polyol ether, 15-20 parts of ethanediol, 25-30 parts of triethanolamine, 15-18 parts of molasses, 13-15 parts of lignin, 0.03-0.06 part of sodium chloride, 0.5-1 part of silane coupling agents and 40-45 parts of water. By means of the obtained cement grinding aid, in the cement production process, the phenomena of clinker fine particle aggregation and ball pasting can be effectively improved, mobility of clinker particles is enhanced, thereby the pulverization effect of grinding media in a grinding machine for materials is enhanced, grinding efficiency can be improved by 15-20%, the cement machine-hour yield is increased, electricity consumption is greatly lowered, production cost is lowered, in addition, strength of cement at different ages can be remarkably improved, and flowability of the cement is improved.

The invention provides a low-temperature early-strength high-strength underwater grouting material. The low-temperature early-strength high-strength underwater grouting material consists of the following ingredients in parts by weight: 30-45 parts of ordinary Portland cement, 45-60 parts of fine aggregate, 5-10 parts of mineral powder, 2-4 parts of encryption silica fume, 0.5-1 part of a compound expanding agent, 0.2-0.5 part of an early-strength powdery water reducer, 0.1-0.5 part of nano hydrated calcium silicate, 0.3-0.5 part of a compound early-strength agent and 0.1-0.3 part of a dispersion-resistant compound. The low-temperature early-strength, low-temperature high-strength and dispersion resistant properties of the low-temperature early-strength high-strength underwater grouting material in water are improved at the same time in the four aspects of reducing the void ratio of the aggregate, optimizing the expanding components and improving the nano early strength and the dispersion resistance, the construction performance, such as the water holding performance and the viscosity, of the grouting material are remarkably improved, the 1d strength and the 28d strength of the grouting material under the undersea low-temperature condition are effectively improved, and the underwater dispersion resistance of the grouting material can be greatly improved. The low-temperature early-strength high-strength underwater grouting material has favorable low-temperature early-strength, low-temperature high-strength and underwater dispersion resistant functions.

The invention discloses a cement grinding aid and a preparation method thereof. Raw materials of the cement grinding aid consists of 10-30 percent of triethanolamine, 12-30 percent of tirisopropanolamine, 5-20 percent of ethylene glycol, 3-10 percent of propanediol, 15-40 percent of water, 1-5 percent of sodium dodecyl benzene sulfonate, 3-10 percent of lignin and 2-5 percent of anhydrous sodium sulfate; water is poured into a reactor and heated to 40-50 DEG C to be reserved; the sodium dodecyl benzene sulfonate is added to be stirred for 15min; the anhydrous sodium sulfate is added and stirred for 10min, then the lignin is added and stirred for 30min; materials in the reactor are filtered by a 150 mesh screen; the ethylene glycol and the propanediol are added and stirred for 20min; the triethanolamine and the tirisopropanolamine are added and stirred for 30min and the grinding aid products are obtained. The cement grinding aid can improve grinding efficiency and early and later strength of cement and reduce cement cost.

The invention discloses ultrahigh-strength concrete which comprises the following components in parts by weight: 300-350 parts of cement, 270-315 parts of composite mineral admixture, 30-35 parts of composite expanding agent, 96-112 parts of water, 680-720 parts of river sand, 1012-1080 parts of gravel, 13.2-14.0 parts of polycarboxylic acid high-efficiency water reducing agent, 4.4-4.7 parts of plastic retaining agent and 0.18-0.21 part of defoaming agent, wherein the composite mineral admixture is prepared from 42-49 parts of ore powder, 150-175 parts of fly ash, 30-35 parts of silica fume, 18-21 parts of zeolite powder and 30-35 parts of wollastonite powder. The invention is characterized in that the 60d concrete compression strength is 140-160 MPa, the 60d splitting tensile strength is 9.2-10.2 MPa, extruded concrete can achieve self-compaction effect within 3 hours, and the 14d self-shrinkage value is less than 0.05%.

The invention discloses a method for preparing micro expanded inorganic heat insulation mortar. Materials such as common silicate cement, desulfuration ash, calcium carbonate powder, re-dispersible latex powder, hydroxypropyl methyl cellulose ether, wood fiber, polypropylene fiber, surfactant, foam stabilizer, water, vitrified micro bubbles and the like are adopted; and the mortar is obtained by adopting the steps of stirring, mixing, shaping, curing and the like. The method has the advantages of low cost, early micro expansion, low later linear shrinkage rate, fire resistance, durability and the like, is easy to construct, and achieves good effect of preparing the I-type building heat insulation mortar by using the III-class vitrified micro bubbles.

The invention discloses a specialadmixture for pervious concrete and application of the specialadmixture. Thespecial admixture comprises the following materials in weight percent: 5 to 15 percent (solid content) of a water reducing agent; 0.1 to 1 percent of a retarder; 0.1 to 1 percent of a thickener; 15 to 25 percent of an early strength agent; 25 to 50 percent of a water-repellent agent; 25 to 50 percent of rubber powder. The admixture overcomes the problem that the existing pervious concrete is not easy to transport bya tanker, and ensures that the phenomenon of blocking cannot occur when the pervious concrete is put into a tanker after the admixture is used, has excellent service behavior after the pervious concrete is discharged from the tanker, and has excellent cohesiveness, without phenomena of bottom sealing and hole blocking.

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.

The invention relates to a non-sintered ceramic aggregate with stone coal vanadium extraction tailings as a main raw material and a preparation method thereof. The non-sintered ceramic aggregate comprises the following raw material components in percentage by weight: 45-60 percent of stone coal vanadium extraction tailings, 10-30 percent of fly ash, 7-15 percent of solid alkali exciter, 5-10 percent of cement, 5-10 percent of quick lime, 2-5 percent of gypsum and 5-15 percent of water. The preparation method comprises the following steps of: according to the raw materials and the contents thereof, uniformly mixing the stone coal vanadium extraction tailings and the solid alkali exciter and grinding to be below 0.074 mm to prepare a prefabricated material; adding the fly ash, the cement, the quick lime, the gypsum and the water into the prefabricated material and uniformly stirring to prepare a mixture; aging the mixture for 1-3 hours; pelletizing; aging for 3-7 days; holding in an autoclave; and autoclaving under the condition of 0.8-1.2 MPa for 6-10 hours. The non-sintered ceramic aggregate has the advantages of environmental friendliness, simple process, low energy consumption and high utilization rate of tailings; and a prepared non-sintered ceramic aggregate product has high strength and good thermal insulation performance.

The invention discloses an industrial waste residue dry-mixed mortar. The industrial waste residue dry-mixed mortar takes cement, phosphorus slag powder, fly ash, composite activators, composite additives and sand as raw materials and is prepared after all the raw materials are mixed evenly. The industrial waste residue dry-mixed mortar comprises, by weight, 18-22 parts of cement, 35-45 parts of phosphorus slag powder, 35-45 parts of fly ash, 0-20 parts of composite activators, 0.1-7.5 parts of composite additives and 65-85 parts of sand. The industrial waste residue dry-mixed mortar can take a large number of phosphorus slag and fly ash as raw materials and is advantaged by low production cost, low energy consumption, less pollution, good workability, good mechanical properties, good durability, reliable quality and wide adaptability.

The invention provides an alkali-free liquid accelerator and a preparation method thereof and belongs to the technical field of concrete admixtures. The alkali-free liquid accelerator is prepared fromthe following raw materials: aluminum sulfate, ferrous sulfate, sodium fluoride, magnesium fluosilicate, precipitated hydrated magnesium silicate, diethanol amine and water. The alkali-free liquid accelerator has a good rapid hardening effect, can effectively shorten the coagulating and final setting time of concrete, and effectively improves the early strength and the later strength of concrete.The preparation method of the alkali-free liquid accelerator comprises the following steps: stirring water and precipitated hydrated magnesium silicate for 15-20 min at 40 DEG C; then adding ferroussulfate and sodium fluoride, and performing mixing and stirring for 8-15 min; after that, adding aluminum sulfate; performing heating up to 75-85 DEG C; after a reaction for 1 h, adding magnesium fluosilicate, and performing stirring for 20-40 min; and at last, adding diethanol amine, performing stirring for 18-25 min to prepare the alkali-free liquid accelerator. The preparation method is simple,the reaction is safe, and the prepared accelerator has good dispersibility.

The invention discloses a polycrystal inorganic lightweight aggregate thermal insulation mortar. The polycrystal inorganic lightweight aggregate thermal insulation mortar comprises cement, redispersible latex powder, hydroxymethyl propyl cellulose ether,air entraining agent, organosilicone water repellent, closed perlite or glass beads. 98% of the thermal insulation mortar is an inorganic incombustible material; the thermal insulation mortar has integrative functions of heat insulation, decoration, fire retardance, water retardance, climatic change resistance and the like; moreover, the process is simple and easy to operate; quality problems caused by construction technique can be reduced; the development cost is lowered; and large-range promotion and application are promoted.