高强钢筋连接套筒灌浆料配制与性能试验研究

Research on preparation and performance test of high strength reinforcement connection sleeve grouting material

为研究应用于装配式建筑钢筋连接的套筒灌浆料,做了抗压强度等级C80套筒灌浆料配合比及性能影响规律试验研究。通过单因素试验研究了水胶比、矿物掺合料、胶砂比对套筒灌浆料性能影响规律及作用机理。试验结果得出:(1)水胶比增大,初始及30 min流动度均逐渐增大,1 d、3 d、28 d抗压强度均逐渐减小,确定最终试验最佳水胶比为0.245。(2)石膏对于竖向膨胀率影响显著,石膏比例4.5%时膨胀率值达到最大值,3 h、24 h分别为0.09%、0.24%;粉煤灰对于流动度影响显著;适宜硅灰掺量能够提高28 d强度。得出胶材最佳比例m(水泥)∶m(石膏)∶m(粉煤灰)∶m(硅灰)=89%∶3%∶5%∶3%。(3)胶砂比能够提高强度,降低流动度,试验最佳胶砂比为1.1,初始流动度达到315 mm,28 d抗压强度达到88.99 MPa。

In order to study the application of sleeve grouting material for steel bar connections in prefabricated buildings,an experimental study was conducted on the mix proportion and performance influence of sleeve grouting material with compressive strength grade C80.The influence and mechanism of water cement ratio,mineral admixture,and cement sand ratio on the performance of sleeve grouting material were studied through single factor experiments.The experimental results show that:(1)As the water cement ratio increases,the initial and 30 minute flowability gradually increase,and the compressive strength gradually decreases at 1 day,3 days,and 28 days.The optimal water cement ratio for the final test is determined to be 0.245.(2)Gypsum has a significant impact on the vertical expansion rate.When the gypsum ratio is 4.5%,the expansion rate reaches its maximum value,and after 3 hours and 24 hours,it is 0.09%and 0.24%,respectively.Fly ash has a significant impact on flowability;The appropriate amount of silica fume can increase the strength by 28 days.The optimal ratio of adhesive material m(cement)∶m(gypsum)∶m(fly ash)∶m(silica fume)=89%∶3%∶5%∶3%.(3)The adhesive sand ratio can improve strength and reduce flowability.The optimal adhesive sand ratio in the experiment is 1.1,with an initial flowability of 315 mm and a compressive strength of 88.99 MPa after 28 days.