Research On Preparation And Performance Of New Type High Performance Lightweight Aggregate Concrete Based On Inorganic Polymer Cement

China is one of countries suffering the most serious environmental pollution in the world. It is the key issue to solve the environment pollution problem by controlling emissions of dust and harmful greenhouse gases from the mass production of Portland cement. High performance lightweight aggregate concrete based on inorganic polymer cement is a kind of new type high strength lightweight structural building materials developed by our research group, which was combined green environment friendly binders with light weight aggregate concrete technology. It is not only meet the requirements of environmental protection and sustainable development by saving energy and reducing emissions but also have high performance. Focusing on the hot issue of the preparation and properties research of inorganic polymer cement and high performance lightweight aggregate concrete, in this thesis, we made a systematic study of the preparation and performance optimization of inorganic polymer cement. A new method of concrete proportion research to the features of high performance lightweight aggregate concrete based on inorganic polymer cement was proposed. A detailed study on mixture performance research of high performance lightweight aggregate concrete based on inorganic polymer cement and microstructure, mechanical property and durability of hardened concrete was carried out. A deep analysis on the influence law of water-binder ratio, volume fraction of light weight aggregate and age to the mechanical property of high performance lightweight aggregate concrete based on inorganic polymer cement was made.The main achievements of the dissertation are as follows:1. Inorganic polymer cement was first used in lightweight aggregate concrete to solve the problem of alkali-aggregate reaction in this dissertation. It is not only solved the alkali-aggregate reaction of inorganic polymer cement thoroughly,but also broaden the research and application of high performance lightweight aggregate concrete based on inorganic polymer cement.2. Multiple composite powders were first used to optimize the properties of inorganic polymer cement in this dissertation. The main ingredient of multiple composite powders was slag powder and other ingredients of multiple composite powders were metakaolin and fly ash. The mechanism of optimization performance of inorganic polymer cement paste was using the complementarity of reaction speed and reaction products of multiple composite powders to make the hardened paste more dense.3. Compared with the paste of inorganic polymer cement based on single component or bi-component mineral powders, the paste of inorganic polymer cement based on multiple composite powders have low water demand and good water-holding capacity. The flowability of the paste of inorganic polymer cement based on multiple composite powders was increased as the water consumption increased, there has obvious linear relationship between the flowability and the water consumption.4. A new method of mix design of high performance lightweight aggregate concrete based on inorganic polymer cement had been proposed according the feature of the concrete and adopting the existing experience. A relational model between water-binder ratio and the compressive strength of inorganic polymer cement paste had been build up based on the macroscopic structure model of the paste and test data. The problem of optimal sand ratio of mix design of high performance lightweight aggregate concrete based on inorganic polymer cement had been solved by CPM.5. A systematic research of mechanical properties of high performance lightweight aggregate concrete based on inorganic polymer cement was carried out for the first time. A proposed model of σ-ε curve has a good agreement with measured σ-ε curve. The test results showed that the mechanical properties of high performance lightweight aggregate concrete based on inorganic polymer cement was superior to the mechanical properties of high performance lightweight aggregate concrete based on slag portland cement.6. The resistance test of sulfate attacks of high performance lightweight aggregate concrete based on inorganic polymer cement was carried out for the first time. The resistance of sulfate attacks of high performance lightweight aggregate concrete based on inorganic polymer cement was superior to the resistance of sulfate attacks of high performance lightweight aggregate concrete based on slag portland cement under the conditions of semi-soak, all-soak and dry-wet cycle.