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Arthur Daniel Limantara
Sekolah Tinggi Teknologi Cahaya Surya Kediri
Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Social Sciences

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Economic Model of Concrete Incorporating with Bamboo, Coconut Fiber, Coconut Shell, and Bio-enzym Arthur Daniel Limantara; Joko Suyono; Bambang Subiyanto
CAHAYA AKTIVA Vol 10, No 1 (2020): MARET 2020
Publisher : POLITEKNIK CAHAYA SURYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47047/ca.v10i1.65

Abstract

Additional material in the concrete mixture has several objectives such as Reducing Cement Content, Hydrating Heat, Reducing Shrinkage cracks, and Increasing Compressive Strength, etc. While natural waste such as bamboo, coconut fiber, and coconut shell as substitutes for concrete mixtures with the aim of reducing waste and green concrete. This paper aims to obtain an economic model for utilizing waste materials and reducing the amount of cement so that the concrete meets the elements of waste reduction and green. The methodology for making concrete mixture test specimens is the design of concrete mixtures modified with concrete mixtures with bio-enzymes and coarse aggregate substitution with natural bamboo waste, coconut fiber, and coconut shell at 15% volume of coarse aggregate. Test for 15x15x15 cm3 concrete cube at 28 days with a plan to reduce cement usage. The optimal percentage of cement reduction in the standard, bamboo, coconut fiber, and coconut shell design mixes was 30%, 24%, 18%, and 15% respectively. While the value of the cost savings for 1 m3 of normal / bio-enzyme concrete mixture is IDR 79,409, while for substitution of blends with natural ingredients is IDR 53,527; IDR 27,645; and IDR 14,704. The conclusion obtained is that economically using bio-enzymes in standard concrete mixes has a high value, while substitution with natural ingredients is intended to increase permeability and porosity.Keywords: Cost Saving of Concrete, Economic Value, Coconut Shell and Fiber, Bamboo, Bio-enzym.
Analisis Stock Split Terhadap Harga Saham PT Jaya Real Property Tahun 2010-2016 Ina Novitasari; Dwi Budiadi; Arthur Daniel Limantara
CAHAYA AKTIVA Vol 10, No 1 (2020): MARET 2020
Publisher : POLITEKNIK CAHAYA SURYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (143.932 KB) | DOI: 10.47047/ca.v10i1.62

Abstract

Stocks with low levels of sale can be explained because the stock price itself is too high.There are some efforts done by the company in preventing stock splitting with the aim of lowering the stock price and also having the main objective to attract investors to investors to liquidate the company's shares. Research on stock splitting (stock split) has been done several times but it gives different results. Then needs further research.Research was conducted at PT Jaya Real Property Tbk in 2010-2016 which carried out a stock split and did not carry out any other policy than stock split. Determination of the sample using purposive sampling. This study uses a different test analysis using the Paired Sample T-Test to find out whether there is a significant difference in the price of shares before and after the stock split Test results of the Paired Sample T-Test before and after the stock split of stock prices prove a drastic difference.Keywords: Stock split ,Pared Sample T-Test test
Co-Authors Bambang Subiyanto Dwi Budiadi Ina Novitasari Suyono, Joko