【摘要】 选用极性单体马来酸酐(MAH),在非隔氧条件下以过氧化苯甲酰(BPO)为引发剂对废弃橡胶粉表面进行接枝改性。通过傅立叶红外光谱对接枝产物进行测试,结果表明在1700 cm-1附近出现酸酐的羰基官能团(C=O)特征峰。橡胶细集料掺量同为60 kg/m3时,改性橡胶细集料砂浆28 d抗压强度较改性前基本持平,而用NaOH和马来酸酐改性后砂浆的28 d抗折强度较改性前分别提高11.4%和5%,说明采用改性橡胶粉可使水泥砂浆硬化体韧性、延展性提高。更多还原

【Abstract】 Maleic anhydrid(MAH),one kind of polar monomer,was tried to graft copolymerization on the surface of pulverized waste tyre rubber by using Benzoyl-peroxide (BPO) as initiating agent in the presence of oxygen in this work.Fourier transform infrared(ATR-FTIR) spectra proved that MAH was grafted on the surface of the rubber as the characteristic-peak of carbonyl group appeared at 1 700 cm-1.The results of mechanical property test indicated that with the partial replacement of sand by surface-modified rubber powder the flexural strength of mortar at 28 days was increased by 5%—11.4% and compressive strength was similar compared with control mortar,that was to say that flexural strength to compressive strength ratio of cement mortar,an index of tenacity of cement mortar,was increased.更多还原