Concrete in technological development has progressed very rapidly, so that it is able to open ideas in the use of organic materials as an alternative material for concrete. Genitri seeds are an organic material that can be used as an alternative to the building blocks of concrete. Genitri seeds have very good hardness and have a light volume weight so that they can reduce the large structure weight due to the weight of the concrete itself. The research method used in this study is an experimental method with genitri seeds as a mixture of coarse aggregate in concrete. This study aims to determine how much influence the compressive strength, slump value, volume weight, absorption, using a mixture of genitri seeds with a percentage of 5%, 10%, 15% of the weight of coarse aggregate. The results showed that the highest compressive strength was obtained by the addition of 5% genitri seeds, namely 20.75Mpa with an average slump value of 5.2. In the absorption test, the value of ¼ hour 0.040 1 hour 0.022 4 hours 0.006 24 hours 0.002 was obtained.Beton dalam perkembangan teknologi mengalami kemajuan yang sagat pesat, sehingga mampu membuka pemikiran dalam pemanfaatan material organik sebagai bahan alternatif penyusun beton. Biji genitri merupakan salah satu bahan organik yang dapat digunakan sebagai alternatif material penyusun beton. Biji genitri memiliki kekerasan yang sangat baik dan memiliki berat volume yang ringan sehingga dapat mengurangi berat struktur yang besar akibat beban dari berat beton itu sendiri. Metode penelitian yang digunakan pada penelitian ini adalah metode eksperimental dengan biji genitri sebagai bahan campuran agregat kasar pada beton. Penelitian ini bertujuan untuk mengetahui seberapa besar pengaruh terhadap kuat tekan, nilai slump, berat volume, absorpsi, dengan menggunakan bahan campuran biji genitri dengan persentase 5%,10%,15% dari berat agregat kasar. Dari hasil penelitian menunjukkan bahwa kuat tekan tertinggi diperoleh dengan penambahan biji genitri sebesar 5% yaitu 20,75Mpa dengan nilai slump rata-rata 5,2. Pada pengujian absorpsi diperoleh nilai ¼ jam 0,040 1 jam 0,022 4 jam 0,006 24 jam 0,002.
Concrete is one of the construction materials that is widely used. Currently, variations in concrete are being studied. Galvalum waste has high tensile properties but is mild. Its lightweight properties are expected to reduce the weight of the concrete itself. The purpose of this study is to find out the value of strong press, absorption, weight type (E), degree of saturation (Sr), moisture content (Wc), and porosity of the addition of galvalume waste. The method used is a experimental method. Variations in galvalum waste substitution used are 50% and 100% of the aggregate weight is roughT the sample used in the form of a cylinder size of 15cm x 30 cm with the initial quality of fc' 18.67 Mpa. The results of the strong press test showed that the galvalum waste subtitution has not been able to exceed the initial quality of the plan. The highest test result was obtained at a percentage of 50% with a strong press score of FC' 17.94 Mpa. In the percentage, absorption test results are 0.010%, the weight of the type is 2325 kg / m3, the pore number is 0.00232%, the water content is 0.108%, and porosity is 0.00108%.Beton merupakan salah satu bahan konstruksi yang banyak dipergunakan. Saat ini, pengguanaan variasi pada beton sedang banyak diteliti. Limbah galvalum memiliki sifat tarik yang tinggi namun ringan. Sifatnya yang ringan diharapkan mampu mengurangi berat beton itu sendiri. Tujuan dari penelitian ini adalah untuk mengetahui nilai kuat tekan, absorpsi, berat jenis (Ɣ), angka pori (e),derajat kejenuhan (Sr), kadar air (Wc), dan porositas dari penambahan limbah galvalum. Metode yang digunakan merupakan metode eksperimen. Variasi pensubtitusi limbah galvalum yang digunakan yaitu 50% dan 100% dari berat agregat kasar. sampel yang digunakan berbentuk silinder ukuran 15cm x 30 cm dengan mutu awal fc’ 18.67 Mpa. Hasil uji kuat tekan menunjukkan bahwa subtitusi limbah galvalum belum mampu melebihi mutu awal rencana. Hasil uji tertinggi didapat pada prosentase 50% dengan nilai kuat tekan fc’ 17,94 Mpa. Pada prosentase tersebut, didapat hasil uji absropsi yaitu 0,010%, berat jenis yaitu 2325 kg/m3, angka pori yaitu 0,00232%, kadar air yaitu 0,108% serta porositas yaitu 0,00108%.
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