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Fabricated precast concrete slabs were prepared from pretreated vanadium titanium slag and the effects of different curing systems on the compressive strength of the mortar test blockwere studied, and the hydration products and microstructure of vanadium titanium slag and steel slag based precast concrete slabs were described. The results showed that the curing temperature has remarkable effect on early compressive strength of themortar test block. The 28 d compressive strength of prepared vanadium titanium slag precast slab can reach 43.62 MPa at 50 °C maintenance for 1 day. XRD, IR and SEM analysis showed that vanadium titanium slag and steel slag promoted each other and coordinated hydration under the excitation of desulfurization gypsum. The hydration products were mainly needle and rod-shaped ettringite (AFt) and amorphous c-s-h gel. Ettringite is the main source of early strength of vanadium-titanium-steel slag based prefabricated slab. C-S-H gel and AFt interweave grow, compact microstructure is conducive to the improvement of compressive strength of vanadium-titanium slag precast concrete slab. [ABSTRACT FROM AUTHOR]

Objective: To study the structure change of dominant microbial population during activation of stratal microflora under atmospheric pressure (1 MPa) and higher pressure (10 MPa) conditions., Method: The water sample was from Zhan 3 x 24 well produced water in Shengli Oilfield. We activated the bacteria in the water sample under atmospheric pressure and higher pressure, and collected samples at different time intervals. These samples were analyzed by denature gradient gel electrophoresis (DGGE)., Results: Based on the analysis of the number and lightness of DGGE bands, we studied the change of the microbial community diversity activation of stratal bacteria. The species number and total quantity of dominant microbial population were not abundant under oil reservoir conditions. After injecting activation agent, some bacteria grew and reproduced quickly along with the enhancement of nutrition condition, and the structure of dominant microbial population changed., Conclusion: Compared to atmospheric pressure condition, the number of DGGE bands was fewer under higher pressure condition, which indicated that only a few microbial species adapted high pressure conditions. The delayed increase of DGGE bands occurred apparently under higher pressure conditions. In late activation period, the change of DGGE bands was slight, which indicated that, the structure of dominant microbial population readjusted successfully and reached a new dynamic balance. This paper lays the foundation for explaining the relationship between laboratory study and field effect evaluation of microbial flooding.