RESEARCH ON PREPARATION AND PERFORMANCE OF OPEN-CELL FOAM GLASS FOR SPONGE CITY

Dispersed small-scale sponge facilities with porous materials as the base material are widely used currently. To continuously improve the porosity, strength, water absorption, and release capacity of the material without secondary pollution, and adapt to more application scenarios, the modification of porous foam glass was studied. The waste glass powder was used as the main raw material, adding a certain amount of foaming agent, modifier, etc., and then the foam glass with an open-cell structure was prepared. The firing temperature was 500~950 ℃. The prepared open-cell foam glass's microstructure and physical properties were tested. The results showed that the prepared foam glass has many dense and irregular open-cell structures, and the cells relate to each other. The cell diameter is about 0.1 mm to 5 mm, and the porosity rate reaches 93%. The foam glass with a compressive strength of 2.3 MPa can be applied to scenarios with high requirements for compressive strength. By controlling the raw materials, the content of heavy metal pollutants is extremely low without causing pollution to water bodies. The foam glass has strong water absorption and a good sustained release effect, and the saturation water absorption can reach 95%. After 8 h of water release, the water absorption rate (by mass) is reduced to 30%. When used in underground enclosed environments, exhaust design and anti-floating design need to be considered. The study provides a new environmental substrate for stormwater storage and drainage in sponge city, and promotes the application of foam glass in sponge facilities.