In view of the disadvantage that the mechanical properties of cement-based\ncomposites can be significantly reduced by incorporating waste rubber powder\nin situ , the surface modification methods of the original rubber powder by\ncoupling agent KH560, sodium hydroxide, polyvinyl alcohol (PVA), methyl\nhydroxyethyl cellulose ether (MHEC) and tetraethyl orthosilicate (TEOS) as\nprecursors were adopted respectively. The modification of waste rubber powder\nwas studied by Change rate of mortar strength of cement-based composite\nmortar mixed with waste rubber powder. The results show that the hybrid\nmodification method using tetraethyl orthosilicate as precursor has better effect.\nWhen 5 phr ethyl orthosilicate is added, the compressive strength and\nflexural strength of cement-based composite mortar can be increased by 31.7%\nand 28%. Scanning electron microscopy (SEM) results show that the surface\nof waste rubber powder with good modification effect has many protrusions\nand flake-like porous structures which are beneficial to its bonding with cement-\nbased materials.
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