- 黃 靜1，季文玉1，閻培渝2
引用本文摘 ? 要：通過正交試驗研究了水膠比、超細粉煤灰摻量和硅灰摻量對新拌UHPC凈漿的工作性與流變性的影響，選取流動度、黏度系數和水膜層厚度為工作性與流變性的衡量指標，利用綜合平衡法獲得了最優配合比。試驗結果表明：水膠比、超細粉煤灰摻量和硅灰摻量的提高都會造成UHPC凈漿的流動度和顆粒表面水膜層厚度增大，黏度系數減??；超細粉煤灰摻量是凈漿工作性和流變性的主要影響因素，水膠比次之，硅灰摻量的影響最??；UHPC最優配合比：水膠比為0.2，超細粉煤灰摻量為40%，硅灰摻量為8%；以該配合比的成型的UHPC 28 d抗壓強度為128.8 MPa，抗拉強度為20.3 MPa，同時滿足工作性和力學性能要求，且經濟合理。 Abstract: An orthogonality test was carried out for study on the effect of W/C ratio, the superfine fly ash and silica fume content on workability and rheological properties of fresh paste of UHPC, and flow spread, consistency coefficient and water film thickness on particles were taken as the measures of workability and rheological properties. The comprehensive balance method was used to obtain the optimal mix proportion of UHPC. The results show that the increase of W/C ratio, the superfine fly ash and silica fume content of UHPC enhances its water film thickness on particles and flowability, reduces its coefficient of viscosity. The superfine fly ash content is the main factor that affects the workability and rheological properties of UHPC, followed by W/C ratio and silica fume content. The optimal mix proporition of UHPC of the W/C is 0.2, superfine fly ash content of 40% and silica fume content of 8%. The 28 d compressive strength of the UHPC is 128.8 MPa and its flexurary strength is 20.3 MPa. It shows a satisfied workability and mechanical properties, as well as a reasonable economy．
黃靜,季文玉,閻培渝.新拌UHPC 凈漿的工作性與流變性試驗研究[J].混凝土與水泥制品,2022(1):1-6. HUANG J,JI W Y,YAN P Y.Experimental Study on Workability and Rheological Properties of Fresh Paste of UHPC[J].China Concrete and Cement Products,2022(1):1-6.