Influência do uso do fíler de calcário, alumina desativada e escória de alto forno nas propriedades físicas e químicas dos cimentos CPI e CPV ARI RS
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Data
2020-12-21
Autores
Silva, Gilson Vicente da
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Universidade Federal do Espírito Santo
Resumo
In the last decades, the growth of Portland cement production has intensified, given the growth of civil construction. However, the activities of the cement industries are extremely polluting and contribute a large share of CO2 emissions, about 5 to 7% values are due to this activity in the world. With the worldwide focus on increasing additions in Portland cements and under the vision of developing a more sustainable product, research on the topic is necessary. Facing this challenge, different mortars were produced in the laboratory, with a mixture taken as a reference and twenty samples replacing clinker with limestone filler, deactivating alumina and blast furnace slag in proportions up to 50%. The influence of the additions on the chemical characteristics was verified through the standardized tests (sulfur trioxide, insoluble residue, loss on fire, magnesium oxide) and in the physical tests (residue on the 75 micron sieve, hot expansion, paste consistency, beginning and end of handle, and compressive strength, However, the results obtained allowed us to verify that, with regard to the chemical aspect, there was a significant and expected increase in loss on ignition for the sample group containing limestone filler. Regarding the insoluble residue, values above the allowed for the sample group containing deactivated alumina were noted and through the FRX analysis, it was possible to check the oxides of raw materials and cements. As for the physical aspects, it was found that there is a strong relationship between the higher compressive strengths and the physical effects provided by the presence of ultrafine particles. The additions resulted in cements with high compressive strength for all ages in view until 50% reduction of clinker in the composition of CPI and CPV ARI RS cements.
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Clínquer , Alumina desativada , Escória de alto forno