نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده مهندسی عمران دانشگاه تربیت دبیر شهید رجایی
2 دانشیار دانشگاه شهید رجایی تهران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The large volume of cement production includes about 5-8% of CO2 emissions.The adverse environmental effects of CO2 gas as well as the need to increase the strength and durability of concrete led to the introduction of pozzolan. Pozzolan is a substance with a combination of alumina and silica, which will have cement properties if it is amorphous in the vicinity of lime water. In this research, calcined clay was used as pozzolan, first the soil is heated to 700 degrees Celsius to be calcined, then it is replaced with cement with lime powder. In this research, 10 mixed designs were used in 2 ratios of w/c, 0.35 and 0.4. In each proportion of clay at 0, 10 and 20%, limestone powder at 0, 30 and 20%, respectively, and microsilica along with the combination of soil and lime at 0 and 7% by weight as powder materials were replaced by cement. . In order to check the properties of the prepared soil, XRF and XRD tests were performed on it. To investigate and analyze the mechanical properties of concrete from compressive strength tests on 10 cm cube samples at 4 ages of 3, 7, 28 and 90 days, tensile strength on cylindrical samples and flexural strength on prismatic samples at 28 years of age. Fasting was used. over the time and reaching the age of 90 days, designs containing 20% calcined clay and 20% lime Mix3 and Mix8 have more resistance in pozzolanic designs and are introduced as optimal pozzolanic designs.
کلیدواژهها [English]
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