Abstract
Abstract. The use of coal waste (Fly Ash) is currently being developed in building materials technology, as a high-strength concrete mix material. This study aims to determine the strength of concrete by adding fly ash as a substitute for cement in high-strength concrete mixtures. This research was conducted with an experimental method to obtain results and data that would confirm the variables studied. The total number of specimens used in this study were 36 pieces with different sizes of cube tests which were 15 cm x 15 cm x 15 cm. A total of 36 concrete samples were used to test the compressive strength of concrete with a percentage of Fly Ash in 0% (normal concrete), 20%, 25% and 30% with a concrete treatment age of 7 days, 21 days and 28 days. A total of 12 more samples were used to test water absorption in concrete at 28 days of maintenance. Each percentage percentage of Fly Ash uses 3 concrete test samples. The increase in compressive strength occurs at 7, 21 and 28 days in concrete. However, the compressive strength of concrete produced by concrete using the percentage of Fly Ash is always lower than the value of normal concrete compressive strength. From testing the compressive strength of concrete at 28 days of treatment with content of 0%, 20%, 25% and 30% Fly Ash obtained results of 45.87 MPa, 42.67 MPa, 40.89 MPa, and 35.27 MPa respectively
Highlights
IntroductionThe progress of construction technology in Indonesia is increasing
At present, the progress of construction technology in Indonesia is increasing
It can be seen that the greater the percentage of use of Fly Ash as a substitute for cement, the compressive strength decreases
Summary
The progress of construction technology in Indonesia is increasing. It is followed by the development of building materials technology, especially concrete. In the 1950s, concrete with a compressive strength of 30 MPa was categorized as high-strength concrete. In the 1960s to the early 1970s, the criteria were more common to 40 MPa. In the 1960s to the early 1970s, the criteria were more common to 40 MPa At present, it is called high strength for compressive strength above 50 MPa, and 80 MPa as very high strength concrete, while 120 MPa can be categorized as ultra-high strength concrete [1]. High strength concrete according to Indonesian National Standard SNI 03-6468-2000 is concrete which is generally used for pre – stressed concrete such as pre – stressed concrete piles, pre – stressed concrete girders, pre – stressed concrete plates and the like with f'c> 41 MPa
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