Nano Calcium Carbonate Modification Of Aerated Concrete And Preparation Of High Aluminum Aerated Concrete

As environmental compatibility and sustainability becoming increasingly important issues in the construction industry, autoclaved aerated concrete (AAC), which can reuse industry wastes adequately, as a kind of lightweight, high-strength and insulating material, received wide attention again. However, due to unique cell structure and absorbing water property of AAC, many problems have emerged, such as low strength and high dry shrinkage etc. These problems seriously affect the visual impression and utilization and make against the further development of these materials. Aiming at this circumstance, nano calcium carbonate was adopted into AAC in this paper so as to improve the properties of AAC, in the same time, ceramic industry wastes was used to replace quartz sand to produce high aluminum AAC, its mechanical property, durability and microstructure were studied.First, the influences of nano calcium carbonate with different content to the mechanical property and dry shrinkage of AAC were studied. The composition and microstructure of AAC is characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). On this basis, the best content of nano calcium was determined.Second, ceramic wastes was used to replace quartz sand in AAC, and the influences of ceramic wastes with different content to the mechanical properties, durability and dry shrinkage were studied. The composition and microstructure of AAC are characterized by XRD and SEM. On this basis, the best content of ceramic wastes was determined, not only provides a method to prepare high aluminum AAC, but also provides a way to reuse ceramic wastes, conserve land and protect the environment.