8results about How to "Prolong initial setting time" patented technology

According to the device and method for preparing the sprayed concrete alkali-free liquid accelerator at the normal temperature, a stirring barrel cover of a stirring barrel of the device is communicated with a left side feeding hopper and a right side feeding hopper capable of conducting timed discharging, a discharging pipe is arranged at the bottom of the stirring barrel, and a valve is installed on the discharging pipe; a horizontally arranged stirring wheel disc is fixedly connected to the bottom of the stirring shaft in the stirring barrel, a plurality of vertically upward stirring upper blades are uniformly distributed and connected to the outer ring of the stirring wheel disc, a vertically downward stirring lower blade is arranged on the outer ring of the stirring wheel disc between every two stirring upper blades, and the periphery of the stirring wheel disc extends out and is connected with a scraping blade. During preparation, the proportioned liquid raw material of the liquid alkali-free accelerator is put into the left feed hopper and enters the stirring barrel, the powder raw material is put into the right feed hopper and then is pushed into the stirring barrel at regular time by several times for high-speed stirring, and the prepared liquid alkali-free accelerator accelerates the initial setting time of concrete and improves the compressive strength.

The invention relates to a method capable of realizing the whole-process controllability of the hydration reaction rate of magnesium oxysulfate concrete, which comprises the following steps of: firstly, selecting different magnesium oxide raw materials according to the temperature of a construction environment, and adjusting the hydration reaction rate of the concrete by controlling the reaction activity of the raw materials; secondly, according to the environment temperature and the selected magnesium oxide raw material, the initial hydration reaction rate of the concrete is adjusted by regulating and controlling the solution temperature; finally, a temperature adjusting module is bound to the outer surface of the steel pipe to adjust and control the temperature of the concrete in the initial curing process, and the purpose of adjusting and controlling the concrete hydration reaction rate is achieved. On the premise of ensuring that the concrete has good construction performance and mechanical property, the initial hydration reaction rate of the concrete is improved, the production efficiency is improved, and the production quality is ensured.

The invention belongs to the technical field of concrete, and particularly relates to colored black iron powder micro-expansion self-compaction bare concrete which comprises cement, coal ash, fibers, an expanding agent, fine aggregate, coarse aggregate, black iron powder, an additive and water, the fine aggregate is two-zone shaping medium sand, the coarse aggregate is shaping pebbles, the particle size of the pebbles is 5-20 mm, the black iron powder is continuously graded, and the additive is water. The admixture comprises the following raw materials: a water reducing agent, a viscosity reducer, a slump retaining agent, a workability improving agent, a retarder and a defoaming agent, and the doping amount of the admixture is 2.2%-2.7% of the weight part of the cementing material (cement, fly ash and the expanding agent). The invention further provides a construction method of the colored black iron powder micro-expansion self-compaction bare concrete. The method can reduce and even avoid surface defects of concrete, particularly controls bubbles and colors on the surface of the concrete, controls shrinkage cracks of the bare concrete, has crack resistance, is low in hydration heat, and avoids temperature difference cracks of the bare concrete in the early stage.

The invention discloses a terrazzo for a combined layer. The terrazzo is prepared from the following components in parts by weight: 750 to 850 parts of white cement, 100 to 160 parts of silica powder, 150 to 220 parts of calcium-silicon mineral admixture, 900 to 1100 parts of white quartz sand, 100 to 120 parts of coarse aggregate, 5 to 10 parts of alkali-resistant glass fiber, 10 to 100 parts of toner, 170 to 200 parts of water, 4 to 6 parts of modified cellulose ether, 1 to 1.5 parts of defoaming agent and 25 to 35 parts of polycarboxylate superplasticizer. The modified cellulose ether is borate crosslinking modified cellulose ether. The terrazzo decorative layer material has excellent anti-sagging performance, mechanical performance and durability, has certain thixotropy, is suitable for structural design of various special-shaped combined layers with various facades and curved surfaces, and can effectively widen the application range of terrazzo in the field of decoration-structure integrated design.

The invention discloses a difunctional gypsum admixture as well as a preparation method and application thereof, and belongs to the technical field of building material admixtures. According to the invention, vegetable tannin is coated on the surfaces of metal oxide nanoparticles, and another metal ion is coordinated on a tannic acid coating layer to assemble core-shell structure nanoparticles, so that the difunctional gypsum admixture is obtained. The difunctional gypsum admixture provided by the invention can delay the gypsum coagulation time and increase the plasticity time of gypsum slurry, after the admixture accounting for 10-50% of the mass of gypsum is introduced, the initial setting time of the gypsum is prolonged to 20-70 min, meanwhile, the assembly of the core-shell structure gives full play to the synergistic effect of the two high Z elements, efficient shielding of the gypsum to X rays is realized, and the strength of the gypsum is improved. Meanwhile, the problem that metal oxide nanoparticles are difficult to uniformly and stably load on gypsum crystals is solved.

The invention discloses a deep soft soil curing process. The deep soft soil curing process comprises the following steps: S1, mixing and stirring a curing agent main agent, water and an additive to prepare a first slurry agent; s2, the first slurry agent is conveyed into the deep soft soil, the first slurry agent is firstly mixed with the exciting agent in the conveying process to prepare a second slurry agent, and then the second slurry agent is mixed with the water absorbent and then immediately conveyed into the deep soft soil; and S3, the water absorbent, the second slurry agent and the deep soft soil are mixed and stirred, and curing treatment of the deep soft soil is completed. By adopting the curing process, the problems of poor slurry flowability and the like caused by rapid reaction of the curing agent main agent and the exciting agent after mixing and condensation before injection into the soft soil layer can be avoided, and the curing process can be used for reinforcing the deep soft soil.

The application relates to the technical field of building plugging materials, and particularly provides a long-operable-time plugging material, which is prepared from the following raw materials in terms of total weight: 0.02-3% of a retarder, 0.005-2% of a calcium salt, 0.001-1% of a cellulose ether and cement supplementing to 100%. By optimizing the types of the retarder, the calcium salt and the cellulose ether and by stipulating the relative amounts of the retarder, the calcium salt and the cellulose ether, the quick-setting type plugging material has a relatively long retarding time, and the anti-bending performance, the anti-permeation performance, the bonding performance, the heat resistance and the freeze-thaw cycle resistance of the material after solidification are effectively improved.

This application relates to an admixture for riprap concrete engineering, comprising at least the following components: a starch-dextrin retarder, an activator, a polycarboxylate thixotropic agent, and a water-reducing agent. The admixture is used to modify the workability and hardening properties of high self-compacting concrete. The mass percentages of each component are as follows: starch-dextrin retarder: 1.6%-3.5%; activator: 5.2%-21.3%; polycarboxylate thixotropic agent: 0.25%-0.90%; water-reducing agent: 75.2%-90.5%. Adding this admixture to high self-compacting concrete used in riprap concrete engineering can improve the workability of high self-compacting concrete, such as fluidity, thixotropy, and a longer initial setting time, while also providing good volume stability, good impermeability and frost resistance, and lower cement content, resulting in significant economic benefits.