صبا رنجوري

Abstract The increasing number of builders and the problems in human soft soils have pro‎mp‎ted them to think of measures to deal with these problems. These problems include low bearing capacity and high compressibility. Stabilization of these soils with lime and cement has many destructive environmental effects, as well as high costs. Replacement of these materials with industrial wastes that have rich sources of aluminum and silica and their combination with smelting furnace slag to create new generation adhesives (geopolymers) to stabilize clay soils has been investigated in this study. In this study, the effect of different percentages of industrial waste replacement of Jajarm Aluminum Plant, Zanjan Lead and Zinc Plant and Qom Phosphorus Plant with Isfahan iron smelting slag in 2 wet processing conditions (25 ° C) dry (60 ° C oven) and processing times 7 28, 90 days on unrestricted compressive strength of the samples. Uniaxial compressive strength, durability (wet-dry, melting and freezing) tests, XRD-FTIR-FESEM-EDS analysis were performed to study the mechanical properties of durability and microstructure of the samples. The results of this study are summarized as follows: The combination of smelting slag with all three tested materials has increased the compressive strength of the samples. This increase has continued up to 45% replacement of smelting slag, but more than this amount has led to a decrease in strength. For lead and zinc slag in wet and dry conditions, almost one result is obtained. The highest resistance was for samples with 90-day processing. At 0% replacement percentage, the resistance was 4.6 MPa and at 45% replacement rate, the resistance was 7.8 MPa. For samples stabilized with red mud and phosphorus, dry curing conditions had better resistance results and 90-day curing samples had the highest resistance. For red mud, the compressive strength at zero replacement percentage was 5.2 MPa, which increased to 30.8 MPa at 30% replacement percentage. For example, stabilized with phosphorus similar to red mud in dry conditions and processing time of 90 days, the highest compressive strength was obtained. This value is 7.4 MPa for the zero replacement percentage and increases to 45 to 11.2 MPa for the replacement percentage. Durability tests also showed that the samples treated in wet conditions performed better than the samples treated in the dry state and the melting-freezing durability tests showed less resistance than the wet-dry durability tests. Microstructural analyzes have also confirmed the resistance results.

تثبيت خاك , ژئوپليمر , پسماند صنعتي , سرباره كوره آهن‌گدازي , درصد جايگزيني , سيكل‌هاي تر ـ خشك , سيكل‌هاي ذوب ـ انجماد

soil stabilization , geopolymer , industrial waste , iron smelting furnace slag , replacement percentage , wet-dry cycles , melting-freezing cycles

Saba Ranjouri

Dr. Mohsen Sabermahani