2results about How to "Improve cracking performance" patented technology

The utility model belongs to the technical field of building engineering, specifically discloses a heavy nonferrous metal smelting engineering existing pool anticorrosive and anti -infiltration structure. The reinforced concrete bottom plate and lateral wall of structure are closed into pool, the surface of reinforced concrete bottom plate is equipped with waterproof coating, geotextile I, high density polyethylene geomembrane, geotextile II, fine stone concrete layer, epoxy glass steel isolation layer and anticorrosive surface layer in proper order, the surface of reinforced concrete lateral wall is equipped with waterproof coating, geotextile I, high density polyethylene geomembrane, geotextile II, polymer cement mortar layer, epoxy glass steel isolation layer and anticorrosive surface layer in proper order, the layer of aforementioned same name of reinforced concrete bottom plate and lateral wall surface, geotextile and geomembrane correspond to head -tail link, and fine stone concrete layer and polymer cement mortar layer correspond to head -tail link. The utility model has the characteristics of simple structure, convenient construction, good anticorrosive and anti -infiltration performance and low cost.

The application discloses a method for preparing rare earth doped quartz glass by composite acid catalyzed sol-gel, comprising the following steps: mixing tetraethyl orthosilicate, ethanol and deionized water, and adding HCl and HF to make the tetraethyl orthosilicate hydrolyze and polycondensate to form an initial silicon-oxygen network; adding an aluminum salt precursor and a rare earth salt precursor into the obtained system to obtain a doped silica sol, making the doped silica sol gelate and performing aging treatment; performing stage drying on the obtained whole wet gel to obtain a whole dry gel; performing stage heat treatment on the whole dry gel to obtain a porous precursor which maintains a whole form; and directly placing the porous precursor under low-pressure high-temperature conditions for densification treatment without performing powderization, grinding, powder pressing or re-molding to obtain transparent rare earth doped quartz glass. The application does not need powderization and secondary melting, and is suitable for preparation of rare earth doped quartz glass and optical fiber preform materials.