Analytical models for estimating yield stress of high-performance pseudoplastic grout

摘要: Abstract The yield stress of cement grout is commonly determined by extrapolating the shear stress–shear rate flow curve to a zero using an analytical model. High-performance structural grouts, made with relatively low water-to-cementitious materials ratio (W/CM) incorporating various supplementary CMs and rheology-modifying admixtures (RMAs), can exhibit rheological behavior different than that conventional grout. Such mixtures high pseudoplastic thinning characteristics. Therefore, degree error in estimating value high-performance grouts be greater for ones. In this paper, stresses 0%, 0.03%, 0.05%, 0.075% welan gum RMA, mass binder, high-range water-reducer (HRWR) concentrations were evaluated. Mixtures replacement values silica fume blast furnace slag also investigated. All had constant W/CM 0.40. Yield obtained models are compared. results showed that, depending on adopted model, deducted quite different. A new method estimate high-performance, proposed shown result lower estimates other models. For 100% cement, estimated given model found close those De Kee