گلنوش محمدي

In this study, a total of 220 processed and unworked samples were made with fine-grained soil, which is under two hot and dry processing regimes (in the oven) and low (inside ionolite) in three processing times of 7, 14 and 28 days. Performed and maintained under constant conditions. Type of stabilizer In this study, Taftan pozzolan (VA) and smelting furnace slag (GGBFS) and sodium hydroxide and sodium silicate, calcium hydroxide and sodium carbonate were used as chemical activators. Due to the use of economic agents in geopolymers to replace Portland cement and lime (which have environmental detrimental effects on soil and the environment) such as sodium carbonate and calcium hydroxide instead of more expensive activators such as sodium hydroxide, sodium silicate which cost They are relatively high, based on two types of binders such as smelting furnace slag (GGBFS) and volcanic ash (Taftan pozzolan) VA- (these precursors are both cheap and economical and can be abundant and easily available in Iran. Are accessible) In this study, we examined the following objectives: Use lower cost activators such as sodium carbonate and calcium hydroxide and combine them instead of more expensive activators Comparison of resistance of samples made with sodium carbonate and calcium hydroxide with sodium hydroxide, sodium silicate Economic analysis and eva‎luation of costs related to activators of sodium carbonate and calcium hydroxide, sodium hydroxide, sodium silicate due to their resistance Investigation of the effect of geopolymer on the strength of stabilized samples with inexpensive activators by uniaxial test and comparison with untreated samples Investigation of strength parameters of VA-based geopolymer-stabilized samples and GGBFS-stabilized samples, which are considered as economic precursors. Analysis of the structure of samples stabilized with geopolymer by SEM and XRD experiments and their comparison with unstabilized samples. The following results were briefly obtained: In the ratio of water to adhesive 1.1, less resistance was obtained for most of the processed samples. By increasing this ratio from 1.2 to 1.4, we saw an increase in resistance in all cases, Further increase of this ratio, ie from 1.3 to 1.5 in all conditions of the sample in dry and wet conditions (except for the 28-day sample at humid temperature with GGBS binder for the activating mixture containing sodium carbonate and calcium hydroxide) reduced the resistance, which is due to There was an increase in the amount of water in the sample. The results showed that by adding volcanic ash along with slag in most samples we saw an increase in resistance. The trend of increasing the resistance was such that by adding the amount of slag, first the resistance of the samples increased, then from the ratio of water to adhesive 1.4, the trend of resistance of the samples decreased. After geopolymerization reactions, the type of crystalline phases did not change and only the intensity of the crystalline phase peaks and the amount of amorphous phase occurred. The observed changes in resistance were due to changes in the structure of the amorphous phase.

تثبيت خاك،ژئوپليمر،سيمان،اقتصادي كردن،فعال كننده

Soil stabilization, geopolymer, cement, economization, activator

Golnoush Mohammadi

Dr. Mohammad Hasan Baziar - Dr. Nader Shariatmadari