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".
关键词
盾构管片/机制砂混凝土/改性聚醚引气剂/渗透性/孔径分布
Key words
shield segment/manufactured sand concrete/modified polyether air-entraining agent/permeability/pore diameter distribution
维普
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