1 workability.When fly ash is added to concrete, it can significantly improve the workability of concrete mixture, because:

A.Fly ash is composed of spherical vitreous bodies of different sizes, with dense and smooth surface, which can play a ball effect in concrete.

B.Cement particles of fresh concrete mix tend to aggregate into groups and are mixed with fly ash. Due to the surface electronegativity, cement particles can be effectively dispersed and more slurry can be released to cover aggregate particles.

C.It can reduce the water consumption, reduce the water-cement ratio of concrete to a lower level and reduce the segregation and bleeding of concrete mixture.The workability of HVFAC is related to the quality of fly ash, the variety and quantity of admixture.

2 setting time.The content of fly ash has an obvious delay effect on the setting time of cement paste, and the setting time is prolonged with the increase of the content of fly ash, this phenomenon is more obvious in cement paste with water reducer.

3 Heat of hydration.Because HVFAC contains a lot of fly ash and the corresponding amount of cement is reduced, less heat is generated by hydration.Therefore, the spontaneous temperature rise of HVFAC is much lower than that of Portland cement concrete.It has good effect on the integrity, durability and safety of concrete.

4 corrosion resistance.Because fly ash reduces the porosity of concrete, makes the holes finer, and improves the compactness of concrete, its impermeability, resistance to sulfate erosion and resistance to Cl- erosion durability.Due to the dilution and absorption of alkali, the effective alkali content is reduced, that is, the alkali concentration in the pore solution and the alkali aggregate reaction are inhibited.

5 strength performance.Due to the large content of SiO2 and Al2O3 in fly ash, the insoluble and safe CaSiO2 is formed by the action of Ca(OH)2 released by cement hydration, which improves the strength. That is to say, the activation effect of fly ash promotes the improvement of compressive and flexural strength of concrete, especially the flexural strength.

6 carbonization resistance.Cement varieties, water-cement ratio and fly ash content have certain effects on the strength of fly ash concrete.The higher the water-binder ratio and fly ash content, the lower the strength of fly ash concrete.The carbonization depth of fly ash concrete deepens with the extension of time.The carbonization resistance of concrete decreases with the increase of fly ash content, and the decline trend is relatively slow when the content is 20% ~ 30%, and greatly increases when the content is more than 50%.

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