Research On The Rheology Characteristic Of Silicate-Sulphoaluminate Compound Cement Under Small Amplitude Oscillatory Shear

Cement is a widely used in the construction field of inorganic gelled material,in a lot of use of various special purpose cement produced.silicate-sulphoaluminate Compound Cement solidification time is short,the structural strength is relatively high,and price is low wait for an advantage to become the research focus in the field of cement now.Cement is certain to be referred to when using the rheological properties of cement grout in the grouting in areas such as greater demands of the rheological properties of cement grout.In a lot of silicate-sulphoaluminate compound cement study which have little study on rheological properties,and compound cement has the characteristics of rapid solidification must be made with ordinary cement slurry rheological characteristics are different.It is helpful to study the rheological properties of silicate-sulphoaluminate compound cement slurry to promote its use.and provide the theoretical basis and scientific basis for its application in engineering application.In this paper,a new experimental method of small amplitude oscillatory shear is used to study the rheological properties of silicate-sulphoaluminate compo und cement slurry,which avoids the problem that the cement slurry structure is easy destroyed in the usual research method.This new experimental method can get more accurate experimental results.In this paper,the silicate-sulphoaluminate compound cement slurry viscosity characteristics,thixotropy and the deformation characteristics were studied,the following research results are obtained:(1)Under the condition of different compounding ratio,the time-varying mode of silicate-sulphoaluminate compound cement slurry is different,and there are three kinds of patterns,such as convex type,inverse "L" type and "S".These three modes are significantly different from the individual PC32.5R,R·SAC42.5 cement slurries,at the same time,the rate of growth of the cement slurry viscosity is faster than the two separate cement slurries.silicate-culphoaluminate compound cement slurry Thixotropy with the increase in PC32.5R cement content,the overall increase is then decreased and then increased again and then decreased,like “M” type.(2)The temperature has a great effect on the viscosity mode of silicate-sulphoaluminate compound cement slurry,especially when the PC32.5R cement content is higher and lower,this effect is very obvious.No matter what kind of compound ratio conditions,the temperature of the compound cement slurry viscosity growth rate has increased the role of.At the same time,the thixotropy of the compound cement slurry increases as a whole,but the increasing trend is different under different compound ratio.The individual PC32.5R cement slurry decreases with increasing thixotropy,and the R·SAC42.5 cement slurry decreases first and then increases.(3)The-water cement ratio has a certain effect on the viscosity mode of silicate-sulphoaluminate compound cement slurry,which is less than the temperature and compounding ratio.The higher water-cement ratio,the slower the growth rate of compound viscosity The water-cement ratio increases,the thixotropy of the composite cement slurry decreases linearly,while the individual PC32.5R,R·SAC42.5 cement slurry does not have this characteristic.(4)The thixotropy of the silicate-sulphoaluminate compound cement slurry increases with time and increases linearly in the hydration process.(5)The compounding ratio,temperature and water-cement ratio had some influence on the deformation characteristics of silicate-sulphoaluminate compound cement slurry,and the proportion of compound ratio was larger,and the temperature and water-cement ratio had less effect.