eva‎luation of geopolymer based on aluminum dross, volcanic ash and ground granulated blast furnace slag in clayey sandy soil stabilization

11/20/2022 12:00:00 AM

In this study, the ability of aluminum dross-based geopolymer in stabilizing clayey sand has been investigated. The ratio of activator to binder, different weight percentages of binder and curing time and temperature are the variables studied in this study. Also, the effect of adding volcanic ash and ground granulated blast furnace slag (GGBS) to aluminum dross on compressive strength has been investigated and the effect of activator type has been studied using sodium hydroxide and sodium silicate solution separately. Two methods have been used to make the samples. In the first method, the ratio of activator to binder is kept constant and in the second method, the ratio of activator to soil is kept constant. Unconfined compressive strength test (uniaxial) was used to determine the strength of the samples and FESEM-EDS-Mapping, XRD and FTIR tests were performed to study the microstructural characteristics of the samples. The results of this study show that curing in oven (60° C) leads to higher strengths than curing in ambient temperature. The highest strength was obtained from samples with 20wt% binder. The binder consists of a mixture of aluminum dross and GGBS and is activated with sodium hydroxide solution. In ambient temperature curing, compressive strength has increased from about 0.5 MPa in untreated soil to 5.5 MPa in stabilized soil, and compressive strength of samples cured in oven has increased from less than 2.5 MPa to 12 MPa.

تثبيت خاك , ژئوپليمر , سرباره ي آلومينيوم , خاكستر آتشفشاني , سرباره ي كوره ي آهن گدازي

Soil stabilization , Geopolymer , Aluminum dross , Volcanic ash , GGBS

Mona Narimani

Hamidreza Razeghi