Performance of pervious concrete modified by microcrystalline cellulose
The microcrystalline cellulose(MCC)was modified to prepare pervious concrete.The influences of different contents of modified cellulose(MCCPA)on the mechanical strength,permeability coefficient and water purification performance of pervious concrete were explored,and the hydration products and microscopic morphology of the concrete were analyzed.The results showed that when the MCCPA content was 0.15％,the compressive strength of specimens at 7 d and 28 d and flexural strength at 28 d were the best,which were 22.48 MPa,29.52 MPa and 4.16 MPa,which increased by 15.16％,9.49％and 15.88％compared with the control group,respectively.The work and permeability performance of modified pervious concrete have been improved.When the MCCPA content is 0.20％,the permeability coefficient is 3.79 mm/s,which is 15.90％higher than the control group.The purifi-cation capacity of heavy metal ions was further enhanced compared to the control group.When the MCCPA content was 0.25％,the removal rates of Cu2+and Cr3+were 67.53％and 74.51％,which were 19.48％and 39.19％higher than that of the control group,respectively.MCCPA has good compatibility with cement,which can be embedded into the cracks of cement slurry to opti-mize the structure,promote the formation of C-S-H gel,and improve the crack resistance of the cement slurry microstructure.
万方数据
维普
