The Effect of Modified Straw on Microstructure of Soil Consolidation Material

The application of wheat straw fiber reinforced cement-based composites (WFCC) was restricted because of the poor mechanical properties and lots of extractives of wheat straw in cement paste. In order to overcome the natural defects, the wheat straw was modified respectively by different mass fractions of NaOH, Na2SiO3 and H3PO4 solutions. The results show that, the various indexes of wheat straw fiber soaked by NaOH solutions (mass fraction 5%) for 12 hours were optimal. Moreover, its ultimate tensile strength and fracture elongation were respectively increased by 104.81% and 78.57%. Meanwhile, the modified fiber bundles arranged densely without damage phenomenon in WFCC, and surface of fiber was covered in massive cement hydration products, and the interfacial adhesion between fiber and hardened cement paste was improved.