Experimental Investigation of High-Strength Concrete Using Urmia Local Materials

This research seeks to introduce high-strength concrete (HSC) using Urmia local materials (ULMs) in the aspects generally expected from this type of concrete volume unit. HSC is a type of concrete whose ۲۸-day characteristic unconfined compressive strength (UCS) is more than ۴۰ MPa. The strength of normal-strength concrete (NSC) is between ۲۱ and ۴۰ MPa. Experimental investigation shows that in many cases, the properties and microstructure of concrete with a UCS of more than ۴۰ MPa are different from NSC. For this purpose, a total of ۲۸ samples were made in ۴ mixing designs with different cement ratios and ۰.۳۵ water-to-cement ratio (W/C) and fixed aggregate consumption for UCS tests were conducted on ۵۰ mm cubic samples at ۷, ۱۴, and ۲۸ days of curing. Before the test date, samples were prepared under standardized conditions and cured in a tank with limewater saturated at ۲۳±۱°C. Under the standard, the average of two samples calculated the UCS value for each day test. The results show that HSC can be made by using ULMs. The highest UCS was related to the ۲۸-day strength of the UL-۰۴ mixing design with the highest amount of cement used (۶۰۰ kg/m۳), around ۶۵ MPa. The findings of the present research show that the UCS of concrete increases with the increase in curing time and the amount of cement used under standard conditions, under the W/C and aggregate fixed. In this research, the investigation possibility of producing HSC using ULMs shows favorable mechanical properties and at the same time provides a sustainable alternative for making HSC, which brings economic benefits and reduces environmental disadvantages such as CO۲ global emissions caused by the transportation of materials.

کلیدواژه ها:

High Strength Concrete (HSC) ، Compressive Strength ، Cement Content ، Economic Concrete ، Urmia Local Materials