4results about How to "High impermeability level" patented technology

This invention relates to the field of caisson bottom sealing construction technology, and discloses a dynamic sealing sludge and water inrush sealing system for caissons. The system integrates a bottom sealing template assembly, a dynamic sealing baffle, a novel quick-setting sealing grout injection assembly, a drainage and pressure relief assembly, a fixing and anchoring assembly, and an anti-sludge isolation assembly. The bottom sealing operation is completed through an integrated process of layered sealing, immediate curing, and simultaneous bottom sealing. During construction, the base is first cleaned and the components are installed; after the dynamic sealing baffle is deployed, it is hydraulically attached to the base plate and the water inrush point is detected; then, quick-setting grout is injected into the leakage area in a targeted manner, and drainage and pressure relief are simultaneously activated to regulate the pressure; after the grout has quickly set, the baffle is retained as a permanent water-stopping structure; finally, underwater concrete is continuously injected through a pre-set pipeline, and an anti-sludge isolation layer is set to ensure the density of the concrete. This system simultaneously achieves rapid water inrush sealing, dynamic pressure balance, and high-quality bottom sealing, solving the problems of poor sealing time, poor process connection, and difficulty in controlling the quality of underwater concrete in traditional processes.

The invention relates to a preparation method of a functional material for a polycarboxylic acid retarder, and belongs to the technical field of polycarboxylic acid retarder additives. The preparation method comprises the following steps: dissolving maltitol in deionized water, adding sodium hydroxide, heating, and slowly dropwise adding ethylene oxide for reaction to obtain a modified maltitol aqueous solution; the preparation method comprises the following steps: adding acrylic acid, allylidene triphenylphosphine and (E)-3-(thiophene-3-yl) ethyl acrylate into a reaction kettle, adding deionized water, an initiator and maleic anhydride, and reacting to obtain an acrylic acid-maleic anhydride copolymer prepolymer solution; adding the modified maltitol aqueous solution and the acrylic acid-maleic anhydride copolymer prepolymer solution into a reaction kettle for reaction, cooling and distilling to obtain the functional material for the polycarboxylic acid retarder. According to the functional material for the polycarboxylic acid retarder, the initial setting time of concrete is effectively prolonged, and the retarding effect is good; meanwhile, the impermeability of the concrete is effectively improved.

This invention relates to a sophorolipid-modified recycled aggregate, phase change concrete, and their preparation method, belonging to the field of building materials technology. The preparation method of the sophorolipid-modified recycled aggregate includes: immersing the recycled aggregate in an oxalic acid solution and rinsing it, then immersing it in an acetic acid solution and rinsing to obtain oxalic acid-modified recycled aggregate; mixing and stirring it with a sophorolipid solution to obtain recycled aggregate adsorbed with sophorolipids; preheating the sophorolipid-adsorbed recycled aggregate and mixing it with liquid paraffin, vacuum impregnating it to remove free paraffin, and cooling to obtain the sophorolipid-modified recycled aggregate. The oxalic acid solution can peel off the old mortar from the surface of the recycled aggregate, exposing the hydrophilic sites of hydroxyl groups; sophorolipids connect the hydroxyl groups of the aggregate and the alkane chains of the paraffin; the vacuum impregnation method increases the paraffin loading and reduces the paraffin leakage rate. This solves the technical bottlenecks of numerous surface defects in recycled aggregates, incompatibility between paraffin and aggregate interfaces, and the difficulty in simultaneously achieving the mechanical properties and phase change properties of concrete.

The application discloses a kind of nano self-repairing concrete waterproofing agent and preparation method thereof, belong to concrete admixture technical field.The application is aimed at the pain point that existing waterproofing agent is single function, full-cycle protection is missing, long-acting is insufficient, construction compatibility is poor, constructs crystalline impermeability, nano self-repairing, phase change temperature control, and four-meshed collaborative system of workability optimization, is compounded by ammonium sulfate, iron sulfate, modified nanometer silicon dioxide, mesoporous silica slow-release carrier, phase change paraffin microemulsion and the like component, is prepared using step dispersion process.The product can reduce hydration temperature rise peak value 8-12 DEG C under 0.5% admixture, 28d impermeability grade reaches P12, 0.4mm crack repair rate is greater than or equal to 92%, self-repairing effective period is extended by more than 5 times, simultaneously adapts two kinds of mainstream construction technology, is suitable for the full-cycle waterproofing of various complex engineering scenes.