2 results about "Micro aggregates" patented technology

The application discloses a concrete track slab mixing material and a preparation method, relates to the technical field of high-speed railway component construction, and through the nucleation effect of a nanocrystalline core early strength agent, the cement hydration process is greatly accelerated, the compressive strength of sleeper concrete is significantly improved after 12h of steam curing, the 1d activity index far exceeds the standard requirement, the rapid demolding requirement of the sleeper is met, and defects such as corner drop and cracks are effectively reduced; the pozzolanic effect of superfine mineral powder and silica fume is continuously exerted, the micro aggregate filling effect of a high polymer viscosity reducer is used, the later strength of the concrete continuously grows, meanwhile, the dense filling effect of the high polymer viscosity reducer makes the internal structure of the concrete more compact, the chloride ion penetration resistance and the frost resistance are significantly improved, and the service life of the sleeper is prolonged.

The application discloses a kind of marine engineering fair-faced concrete based on ecological material and preparation method thereof, it is related to marine engineering building material technical field, the concrete is composed of the following weight fraction components: alkali-activated slag 18~26 parts;Fly ash 6~12 parts;Marine urease-producing halophilic bacterial strain embedded type microbial mineralization precursor 0.8~2.5 parts;Classification calcined discarded oyster shell ecological active aggregate system 28~42 parts;Salt-tolerant exopolysaccharide thixotropic agent 0.03~0.12 parts;Nuclear shell structure recycled micro aggregate 5~15 parts;Alkaline activator, as Na2O equivalent, is 4.5%~7.5% of the total mass of alkali-activated slag and fly ash;Seawater 7~11 parts;Polycarboxylic acid water reducing agent 0.1~0.4 parts, the application is embedded carrier and alkali-activated system synergistically, with salt-tolerant exopolysaccharide thixotropic agent, classification calcined oyster shell aggregate and nuclear shell recycled micro aggregate, realizes crack self-repair, high resistance to chloride ion penetration and fair-faced surface homogenization.