كليدواژه :
تثبيت , زيوليت , تراكم , سيمان , كشش برزيلي
چكيده فارسي :
در اين بررسي، زيوليت به عنوان يكي از مواد افزودني به سيمان و آثار آن در مقاومت كششي مورد ارزيابي قرار گرفته است. در اين راستا، از زيوليت نوع معدني كلينوپيلوليت، سيمان تيپ II نكا و ماسه‌ي بابلسر استفاده شده است. طرح اختلاط 24 حالت سيمان و زيوليت شامل درصد‌هاي سيمان مختلف: 2، 4، 6، و 8 درصد وزن خشك كل نمونه و درصد-هاي جايگزيني 0، 10، 30، 50، 70، و 90 زيوليت با سيمان است. در اين بررسي، ابتدا اختلاط براساس وزن خشك بيشينه و رطوبت بهينه‌ي به‌دست‌آمده از آزمايش تراكم استاندارد بر روي اختلاط‌هاي مختلف، نمونه ها ساخته و در شرايط مطلوب رطوبتي و دمايي به مدت 28 روز نگهداري و آزمايش مقاومت كششي برزيلي به انجام رسيده است. نتايج به‌دست‌آمده نشان داده است كه با جايگزيني 30% زيوليت به جاي سيمان، ميزان مقاومت كششي آن نسبت به نمونه‌هاي بدون زيوليت به ميزان 40% افزايش يافته است.
چكيده لاتين :
The lack of accessibility of high- quality materials and the increased costs associated with the use of these materials will finally necessitate engineers to use local soils. In such cases, ground improvement behaved satisfactorily in many conditions. Ground improvement can be defined as the procedure of increasing shear strength parameters and decreasing the permeability and compressibility of the soil. Different methods can be used to improve the geotechnical properties of the problematic soil, one of which is using additives. Additive stabilization is achieved by the addition of proper percentages of cement, lime, fly ash, bitumen, or combinations of these materials to the soil. The selection of type and determination of the percentage of additive to be used are dependent upon the soil classification and the degree of improvement in desired soil quality. It is known that, when using soil-cement as a compacted layer over low bearing capacity soil, the system failure usually happens under tensile stresses at the base of the improved layer. Then, it would seem more reasonable to use the tensile strength as a direct measure of the soil-cement strength. In this investigation, zeolite and its effect on compaction are studied as one of addictive material to cement. Therefore, Kilinopiolite kind of zeolite, Neka cement type 2, and Babolsar sand are used. 24 combination types of cement and zeolite include different cement percentages: 2, 4, 6, and 8 percent of the total dry weight of samples and replacement percent’s of 0, 10, 30, 50, 70, and 90 zeolites with cement. In this article, first, soil mixture and producing samples based on standard compaction test have been done. Results show that by increasing the replacement
percentages of zeolite with cement, decreasing maximum dry density and 14% optimum water content approximately concluded. Also, by replacing 30 percentage of cement by zeolite material, the tensile strength increased up to 40 % in comparison with cemented samples.
