聚丙烯纤维改良污泥固化体的力学特性研究

Study on mechanical properties of solidified sludge body modified by polypropylene fiber

针对固化污泥开裂强度差的特性,以生石灰、水泥、黏土及聚丙烯纤维为补强材料,对市政污泥进行固化研究,来探索黏土及聚丙烯纤维对固化体强度的增强作用。结果表明:污泥固化体的前期抗剪强度和抗压强度在养护过程中虽有增加,但是增加并不明显,无侧限抗压呈现剪胀破坏,后期过程中抗剪强度和抗压强度均大幅度增加,呈现纤维含量越高,固化体的强度越高的规律,无侧限抗压破坏以剪切破坏为主,成45°破裂角。

According to the characteristics of the low cracking strength of solidified sludge, with lime, cement, clay and polypropylene fiber as reinforcing material, curing is studied for the municipal sludge, to explore the clay and enhancement of the polypropylene fiber strength to the solidified body. The results show that the shear strength and compressive strength of solidified sludge body increases during the curing process, but the increase is not obvious,unconfined compressive dilatancy damage, late in the process of shear strength and compressive strength are dramatically increased, presents the fiber content is higher, the higher the strength of solidified body, unconfined compressive failure to shear failure is given priority to 45° angle of rupture.