宝钢Ⅰ级粉煤灰和超细矿渣微粉制备套筒灌浆料的性能及应用研究

Influences of Baosteel Class Ⅰ Fly Ash and Ultra-fine Ground Granulated Blast Furnace Slag on Properties of Grout for Coupler of Rebar Splicing

套筒灌浆料作为应用于钢筋套筒连接的结构材料,要求其具有早强、高强和高流动性的特点。本文采用宝钢Ⅰ级粉煤灰和超细矿渣微粉制备套筒灌浆料,研究其物理力学性能和工程应用效果。研究表明,宝钢超细矿渣微粉有利于降低套筒灌浆料的用水量,提高流动性以及3h和24h竖向膨胀率,改善粘度,能明显提高3d和28d抗压强度;利用超细矿渣微粉与粉煤灰双掺制备套筒灌浆料,Ⅰ级粉煤灰可进一步降低套筒灌浆料用水量,明显改善粘度和流动性,提高强度,且基本不影响到竖向膨胀率,从而制备出28d抗压强度超过110MPa的性能优良的套筒灌浆料,并成功应用于工程实践。

As a structural material used for coupler of rebar splicing, the properties of grouts, especially compressive strength, are highly required. Grouts were prepared by using Baosteel class Ⅰ fly ash and ultra-fine ground granulated blast furnace slag (ultra-fine GGBFS), which physical and mechanical properties and project application were studied. The results show that the ultra-fine GGBFS can reduce the water demand, increase the fluidity and the vertical expansion rate at 3h and 24h, and obviously increase the 3-day and 28-day compressive strength. With ultra-fine GGBFS and fly ash added in grouts, fly ash can further reduce the water demand, obviously improve the fluidity and compressive strength, and assume negligible influence on the vertical expansion rate. Consequently, the grout with 28-day compressive strength over 110 MPa has been prepared and successfully applied in projects.