TREATMENT OF SEDIMENTARY ROCKS USING CEMENT-BENTONITE GROUTS
Amany Sayed Mohemed Khair;
Abstract
The technology of grouting is considered one of the effective means to improve the properties of the cracked and fragmented rocks. The properties of the cement –based grouts depend on several factors such as; additivestype and content, grout viscosity, curing time, mixing method and surface roughness.Therefore, the aim of the thesis is to make a parametric study to evaluate the shear parameters interfacebetween the rock-cement bentonite grout.Also evaluate the workable properties of cement bentonite grout.EL Mokattam Mountainsedimentary rocks are adopted in this study. Three types of bentonite, one type of silica fume, (Cem 1, 42.5MPa) cement were used. The rheological properties of cement bentonite grouts “viscosity and bleeding” are measured for three types of bentonite. Dry mixing and pre-dispersion of the cement addition to pre-hydrated bentonite method are adopted in this study. Bentonite content is ranging between 0-15%. The shear parameters interface between the rock-cement bentonite grout can be determined after 7 and 28 curing days for smooth and two shear surface roughness.The experimental work results are concluded that:
1- The interface shearing parameters between the rock-grout decreases as bentonite or silica fume content increases.
2- The interface shearing parameter between the rock-grout increase as the grout viscosity and curing time increase. Also interface adhesion between the rock-grout increases as bentonite activity increases.
3- Interface adhesion between the sedimentary rocks-cement bentonite grout is approximately equal 15 times adhesion before grouting, and interface angle of shear friction between the sedimentary rocks-cement bentonite grout is approximately equal 1.9 times angle of shear friction before grouting
4- In case of the dry mixing, interface shear parameters between rock and cement bentonite grout are greater than that in case of the wet mixing by 2.06 times for the adhesion and 1.4 times for the friction angle shear.
1- The interface shearing parameters between the rock-grout decreases as bentonite or silica fume content increases.
2- The interface shearing parameter between the rock-grout increase as the grout viscosity and curing time increase. Also interface adhesion between the rock-grout increases as bentonite activity increases.
3- Interface adhesion between the sedimentary rocks-cement bentonite grout is approximately equal 15 times adhesion before grouting, and interface angle of shear friction between the sedimentary rocks-cement bentonite grout is approximately equal 1.9 times angle of shear friction before grouting
4- In case of the dry mixing, interface shear parameters between rock and cement bentonite grout are greater than that in case of the wet mixing by 2.06 times for the adhesion and 1.4 times for the friction angle shear.
Other data
| Title | TREATMENT OF SEDIMENTARY ROCKS USING CEMENT-BENTONITE GROUTS | Other Titles | معالجة الصخورالرسوبية بإستخدام حقن الاسمنت والبنتونيت | Authors | Amany Sayed Mohemed Khair | Issue Date | 2014 |
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