Abstract
This paper presents the application of�fly ash�combining with microbes in concrete to reduce cement content.�A class F fly ash as cement replacementwas applied with ratios of 20%, 30%, 40%, and 50% to reduce hydration heat. Microbes from bacterial consortium were applied to as the filler to increase concrete compressive strength. The concrete mix design from SNI 03�2834�2000 was applied for a compressive strength target of 30 MPa. The mechanical test was carried out consisting compressive and tensile test.�Concrete�workability�and the heat hydration measurement were performed for fresh concrete.�The results showed that the maximum strength of 45.10 MPa was obtained from specimens with 30% fly ash content.�Application of microbes associated with�fly ash content of 40% showed the maximum strength of 48.47 MPa.�It was found that the tensile strength also increased with the application of�fly ash�and microbes.�Hydration temperature of concrete decreased with the increase of�the ash�content.�This proves that the application of�fly ash�and microbes in concrete can reduce the cement as well as increasing the concrete performance.
Highlights
Concrete is a material commonly used in building structures, roads, and bridges
The replacement of cement with fly ash can be used at 10% fly ash content of cement weight (657 kg/m3 of concrete) and the compressive strength increased as the fly ash content increased to 20%, 30%, and 40%
The compressive strength, split tensile strength and flexural strength of concrete were improved by using fly ash (10% by weight of cement) enriched by Bacillus sphaericus
Summary
Concrete is a material commonly used in building structures, roads, and bridges. It has sufficient strength to support the weight of a structure. This makes cement become one of the factors causing global warming To overcome this problem, concrete technology experts proposed cement replacement to materials increase strength, durability, more economical, and environmentally friendly. Concrete technology experts proposed cement replacement to materials increase strength, durability, more economical, and environmentally friendly One of these efforts is replacing cement with fly ash and microbes application. Ready-mix concrete mixturs which cement was replaced with fly ash of 30-33% showed the same compressive strength results with normal concrete [3]. The compressive strength, split tensile strength and flexural strength of concrete were improved by using fly ash (10% by weight of cement) enriched by Bacillus sphaericus. The influence of microbes to the fresh concrete as well as the concrete performance as a benchmark of fly ash application in normal concrete is the main discussion in this study
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