Abstract: Modification of calcium bentonite by mechanical and mechano-chemical chemistry using a high energy ball mill. The structure and properties of modified muscovites were characterized by X-ray diffractometer, scanning electron microscopy, laser scattering analysis and Zeta potential analyzer, respectively. Then the bentonite modified by mechanical force and the bentonite modified by mechano-chemical force were respectively added to the cement slurry with a water-to-binder ratio of 1. The results show that after mechano-chemical modification, d(001) is changed from 1.52 nm to 1.27 nm, and the calcium ions between the layers of bentonite are replaced by sodium ions, D50 decreases from unmodified 13.5 μm to 0.64 μm, the zeta potential changes from unmodified －5.5 mV to －66.3 mV, which can achieve the dual purposes of particle size reduction and surface modification. After 45 minutes of grinding by high-energy ball mill, the bentonite can make the cement slurry stand for 2 h and the bleeding rate reaches 3.97%. The bentonite after wet grinding of sodium pyrophosphate and bentonite for 15 minutes can make the bleeding rate of the cement slurry reach 3.64%.
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2019, Vol. 33 
