دانلود رایگان مقاله ضایعات پوسته فولاد به عنوان جزئی در تولید ملات

Abstract

The present research reports on the results of some experiments dealing with the recycling of steel scale waste in the production of mortars. Materials were prepared mixing a commercial CEMII/B-LL cement, a steel scale waste, a commercial natural aggregate, superplasticizer and water. Natural aggregate was replaced with different proportions (5, 10, 20, 30 and 40 wt%) of steel scale waste. Water absorption, apparent density, compression strength and thermal conductivity were measured after 28 d of curing. After curing, all hydrated materials displayed: good compressive strength and low water absorption; increased apparent density with steel scale addition; improvement of thermal conductivity in materials containing up to 10 wt% steel scale addition.

4. Conclusions

In the present research the production of stable mortars was carried out using a commercial cement, steel scale waste, natural aggregate, superplasticizer and water. Mortars were produced using fixed w/c, c/a, s/c ratios whereas SSW was added in different proportions. The following important conclusions were derived from the study: 1. All hydrated materials displayed high compressive strength after 28 d of curing as a consequence of their low water absorption so that they all could be classified as high performing mortars; however strength progressively decreases with increasing the addition of SSW; 2. Due to greater specific gravity of SSW with respect to that of the natural aggregate, materials apparent density displayed an increasing trend as a function of SSW addition; 3. Samples containing 5 and 10% of SSW showed the highest thermal conductivity values which was explained taking account of the higher thermal conductivity of SSW if compared to the one of an ordinary concrete coupled with their low water absorption (low open porosity).