Rebound control technology of high air content wet sprayed concrete
To improve the pumpability of wet shotcrete and reduce the rebound rate,a new type of air entraining rheological agent was added to prepare high air content wet shotcrete.The compatibility of air entraining rheological agent with other materials was measured.The working performance,mechanical properties and rebound rate of high air entraining wet shotcrete were studied.The results showed that the foaming and foam stability of air entraining rheological agent were higher than AES and K12.When the content was 0.2％,the foaming capacity was 1050 mL and the half-life was 650 s.Due to the ball effect and the effect of sol-vated membrane,air entraining rheological agent can help improve the fluidity of wet shotcrete and the slump resistance of con-crete.When the dosage of water reducer is 0.8％and air entraining rheological agent is 0.2％,the air content increases from 2.3％to 10.2％compared with ordinary concrete.After adding air entraining rheological agent,the rebound rate of wet shotcrete decreased from 14.56％to 8.79％.The measured dust concentration decreased from 10.82 mg/m3 to 5.96 mg/m3.Other properties met the con-struction performance requirements.
air entraining rheological agentwet shotcreterebound ratiopumpabilityhigh air content
万方数据
维普
