Preparation of modified polyether air-entraining agent and its effect on properties of shield segment concrete
Modified polyether air-entraining agent was prepared by maleic anhydride,various fatty acids,polyethylene glycol with different molecular weight,sodium styrene sulfonate and acrylamide,etc.The effects of modified polyether air-entraining agent and two common air-entraining agents(sodium dodecyl sulfate and modified rosin hot polymer)on the properties of shield segment manufactured sand concrete were studied.The results show that the modified polyether air-entraining agent has the best foaming effect,high foam stability and little time loss,and increases the air content and slump of concrete.When the solid content of air-entraining agent is 0.01％,the modified polyether air-entraining agent can obviously improve the internal pore structure of con-crete,and the compressive strength,water permeability resistance and chloride ion permeability resistance of concrete are better than that of the two commonly used air-entraining agents,and the quality of the shield segment applied to the actual mass production meet the requirements of CJJ/T 164-2011"Standard for quality inspection of shield tunnel segment".
shield segmentmanufactured sand concretemodified polyether air-entraining agentpermeabilitypore diameter distribution
万方数据
维普
