Based on the scientific research project of green tunnel construction,combined with the experimental teaching of concrete performance in construction materials,the mechanical properties and mechanism of concrete with green plant(carrot)extract as natural bio-admixture and fly ash as mineral admixture are analyzed.The new methods and ideas of X-ray diffraction and scanning electron microscope analysis used in the experiment are summarized.New green materials are introduced and a new experimental teaching mode for students is proposed,which combines macroscopic experimental phenomena with microscopic mechanism analysis.As an optimization and supplement of traditional teaching,this model can provide ideas for the innovation of experimental teaching in other courses,which is conducive to stimulating students'interest in experiments and cultivating their comprehensive scientific research inquiry ability not only to know it,but also to know why.
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