Research On Performance Of The Mixed Cementitious Material

This paper is mainly about the new oilwell cementing materials slag and fly ash which are environmental, cost saving industrial waster and the new cementitious material without cement clinker. This dissertation is put forward by the principal target as achieve the manufacturing and developing of low-cost and saving energy material for the oil and gas well cementing job. It is put as the center content that using the industrial discharge slag and fly as the fundamental material to develop the new cementing material without cement clinker. Through the reciprocity, the rules of hydrating and engineering proformance, we can look for and develop the practicable way and the design method of new cementing material.On the base of analyzing the physical and chemical performance of slag and fly ash, the dissertation analyzes and researches the hydration process, hydration products, morphology and microstructure for the mixed cementitious system by using equipment as XRD and SEM etc. It reveals the law and mechanism of hydration and hardening in the slag-fly ash mixed cementitious system. And through carrying on the related survey and analysis to the main engineering capacity transformation of the multi-component system formed by slag and fly ash in different component addition, different activator and additives component and addition, different water-cement ratio condition, such as flow property, rheological property, thickening property, water loss, permeability and strength property etc. It puts forward the law that the factors as grain fraction, component addition, water-cement ratio etc. of slag, fly ash and alkali-activator and other additives affect the engineering capacity of mixed cementitious system. Thus it evaluates the applications of the mixed cementitious system optimized to the oil and gas well conventional cementing job. Thereby it can supply the technical development theory, the experiment foundation and the practicable way for exploring the saving energy, protecting environment and low-cost cementing fluid system.