Mechanical Performance Test of Fly Ash - Cement Concrete Mixed with Alkali Excitant
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Abstract:
Based on the laboratory mix ratio of C30 concrete，the fly ash-cement concrete was mixed with 30% fly ash to make three experimental groups which were also mixed with the best dosages of NaOH, sodium silicate, and CaO, respectively. After vibration molding, the impacts of alkali on the mobility and setting time were determined. The microstructure of mortar was investigated using the scanning electron microscope, and then the samples were maintained to age. According to the 《Standard for test method of mechanical properties on ordinary concrete》, the compressive strength and splitting tensile strength of the concrete were measured. Through the comparison of strengths, the intensity increasing rate was determined, which can help understand the impacts of mixing alkali on the strength development in the early and late times. The results showed that (1) mixing with alkali can coagulate and decrease the mobility of mortar；(2) the fly ash mixed with alkali has a rapid strength development in the early time and a slow strength development in the late time, and the strength at 90 days can meet the design requirements; (3) In the scanning electron microscope experiment, due to the quick cement hydration speed, the activity of fly ash motivates, and so the strength in the early time improves; and (4) the economic and technical benefit is remarkable for the fly ash-cement concrete mixed with alkali excitant.
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