Partial replacement of cement and fine aggregates with marble dust powder and polypropylene fiber

Abstract

Normally sand, cement, gravel is used as a raw material of conventional concrete. Thus, the usage of these raw materials has been increased in a large amount for that reason in future the demand of these constructive materials will get less a chance to be fulfilled and so the cost of these materials will be drastically increased. This research emphasizes on the possibilities of using waste material from different engineering activities to prepare innovative concrete. Marble dust powder as a waste and polypropylene fiber was suggested in partial replacement of cement and fine aggregates. Different papers were studied on the replacement of these waste materials in concrete. The highest strength achieved by the concrete on replacing certain percentages of these waste materials. was found According to that we first replaced the cement with marble dust then when the highest strength was achieved at a particular percentage then at that percentage of replacement it was combined with different percentages of replacement of fine aggregates with polypropylene fibre. To determine the compressive strength, split tensile strength and flexural strength different tests were conducted. The use of marble dust powder was proposed in different percentages as an addition to cement. The replaced percentages are 9%, 11%, 13%, and 15%. Though the replacement percentage of polypropylene fiber with fine aggregates are 0.9%, 1.1%, 1.3% and 1.5%. The compressive strength test, split tensile strength test and the flexural strength test were performed after 7, 14 and 28 days after casting them. It was seen that for 13% replacement of cement with marble dust powder the compressive strength was enhanced by 11.9% after 28 days of casting when analyzed with the blend which has 0% replacement of MDP. Split tensile strength and flexural strength were enhanced by 12% and 12.75%. When 13% replacement of marble dust powder was combined with 1.1% of polypropylene fiber it resulted 15% improvement in compressive strength after 28 days of casting. Split tensile strength and flexural strength improved by 15% and 13.5% after 28 days. M25 concrete grade is designed as per is 456:2000.