Research on the Preparation Technology and Performance of Gypsum Based Compound Insulation Mortar
|Keywords||Building energy efficiency Gypsum -based composite cementitious materials Coagulant Alkaline activator CSH gel Insulation mortar Thermal conductivity|
China's annual emissions of industrial by-product gypsum storage of these solid waste not only takes up a lot of land but also pollute the environment and groundwater resources. Departure from the resource utilization of industrial waste gypsum and building energy efficiency, we propose to FGD gypsum and fluorgypsum as the main raw material, the use of slag modified and incorporated into ordinary portland cement and inspire agent, insurance agent, prepared high strength, water gypsum-based composite cementitious materials. The main performance cementitious materials preparation insulation mortar and gypsum based composite cementitious materials, thereby improving the thermal insulation properties of the plaster wall materials. System to study the impact of various factors on the gypsum based composite cementitious material and insulation mortar. Through experiments, some important results, the results showed that: 1. Coagulant dosage and alkaline activator dosage each 2%, gypsum-based Composite Binder, flexural strength of 7.4MPa The compressive strength of 40.5MPa softening coefficient was 0.96, compared with ordinary gypsum products, strength and water resistance performance improve greatly. Gypsum-based composite cementitious materials hydration products are mainly calcium sulfate dihydrate, calcium silicate hydrate gel and a small amount of calcium ettringite hard xonotlite (Ca6Si6O17 (OH) 2). Calcium silicate gel content is higher, the higher the strength of the material, the better the water resistance. Gypsum-based composite BINDER structure dihydrate gypsum, ettringite crystals and Xonotlite of stone cross symbiotic, CSH gel surrounded around the contact point, unreacted completely slag particles filled pores. Dense crystal gel architecture. 4. Expanded perlite the EPS particles of ash increased insulation mortar dry apparent density decreases, decreased strength, softening coefficient smaller thermal conductivity decreased. Expanded perlite slurry material interpenetrating network structure, combined with a close, however, the the EPS particle surface and the slurry material incompatible, combined interface osteoporosis. The incorporation of a slag to improve the workability of the mortar to improve the strength of the mortar and softening coefficient, increasing the thermal conductivity of the mortar. Latex powder dosage is increased so that the flexural strength, adhesive strength and softening coefficient increases, but the compressive strength decreases. The incorporation of the silicone powder, reduce the water absorption and water absorption rate of the mortar. 5 to determine the reasonable ratio, excellent performance of the two groups insulation mortar. Wherein the insulation masonry mortar thermal conductivity of 0.23 W / m · K, the compressive strength of 7.1 MPa, reached the requirements of the load-bearing insulation masonry mortar, the softening coefficient value of 0.92, and 53% beyond the standard. Insulation hand side 0.053W / m · K, the thermal conductivity of mortar compressive strength of 0.63MPa, 32.5% exceeded the standard the softening coefficient value of 0.67, 34% exceeded the standard. 6. Establish a quantitative relationship of gypsum-based insulation mortar dry apparent density and thermal conductivity, as well as the quantitative relationship between water absorption and thermal conductivity.