Persamaan Korelasi Sifat Mekanik Beton Mutu Tinggi dengan Agregat Alami dan Slag Nikel
DOI:
https://doi.org/10.5614/jts.2007.14.1.3Keywords:
Beton kinerja tinggi, Kuat tekan, Persamaan korelasi, Slag nikel.Abstract
Abstrak. Beton merupakan material konstruksi bangunan yang sering digunakan karena mudah pada waktu pelaksanaan konstruksi dan biaya pemeliharaan yang relatif murah dibandingkan material lainnya. Dengan maraknya pembangunan dimana aspek lingkungan harus diperhatikan, maka agregat kasar dan halus yang berasal dari sumber daya alam sebaiknya dibatasi, bila memungkinkan diganti dengan agregat produk limbah dari industri. Perkembangan ilmu pengetahuan di bidang teknologi beton memungkinkan penggunaan limbah menjadi bahan dasar pembentuk beton, sehingga di satu sisi penggunaan bahan alam yang merusak lingkungan dapat diatasi dan di sisi lain bahan limbah dimanfaatkan seoptimal mungkin untuk bahan dasar pembentuk beton. Dalam setiap minggu, PT. INCO menghasilkan limbah padat berupa terak nikel dalam jumlah relatif besar, yaitu 77.441 ton. Sehingga dapat dilakukan penelitian mengenai penggunaan limbah padat tersebut sebagai bahan dasar pembentuk beton, baik sebagai agregat kasar maupun halus. Tujuan utama penelitian ini adalah untuk mendapatkan persamaan korelasi sifat mekanik beton kinerja tinggi (high performance concrete) dengan agregat alami dan slag nikel. Terhadap seluruh bahan pembentuk beton dilakukan pengujian mengikuti standar ASTM. Bahan dasar pembentuknya terdiri dari semen, agregat kasar, agregat halus, air dan bahan tambahan lainnya. Semua pengujian sifat mekanik beton juga mengikuti standar ASTM dan dilakukan untuk umur beton 3, 7, 14, 21, 28 dan 56 hari dengan masing-masing umur sebanyak tiga sampel. Seluruh data hasil penelitian yang telah diperoleh dilakukan analisis regresi nonlinier. Selanjutnya dibahas berbagai model korelasi sifat mekanik beton yang telah diuji. Berdasarkan analisis model korelasi diperoleh bentuk persamaan sebagai berikut :
y = abttcfc28 , dimana untuk :
Kuat tekan beton : a = 0,389 b = 0,996 c = 0,323
Modulus elastisitas : a = 353 b = 1,001 c = 0,083
Kuat tarik tidak langsung : a = 0,03 b = 1,002 c = 0,115
Kuat lentur : a = 0,052 b = 0,998 c = 0,224
Adapun kelebihan persamaan korelasi yang diusulkan dibandingkan persamaan dalam peraturan yang ada adalah dapat menganalisis sifat mekanik beton kinerja tinggi berdasarkan fungsi waktu 0 < t 56 dan mempunyai nilai standar error yang lebih kecil.
Abstrack. Concrete is construction material of building that is often is applied by easy to when realization of construction and maintenance cost that is cheap relative compared to other material. With the hoisterous of development where environmental aspect to paid attention, hence fine and coarse aggregate coming from natural resources better be limited, if possible is changed with waste product aggregate from industry. Development of science in concrete technology area enables usage of waste becomes concrete former base material, so that in one usage sides of nature material destroying area can be overcome and on the other side waste material is exploited as optimal as possible for concrete former base material. In each week, PT. INCO yields solid waste in the form of
nickel slag in number relative big, that is 77.441 tons. So can be done research about usage of the solid waste as component of concrete former basis, either as fine and coarse aggregate. Purpose of principal of this research is to get correlation equation of high performance concrete with natural aggregate and nickel slag. To all concrete former material is done assaying to follow ASTM standard. Its the former base material consisted of cements, coarse aggregate, fine aggregate, water and other admixture. All assayings of concrete mechanical property also follows ASTM standard and done for concrete age 3, 7, 14, 21, 28 and 56 days, in which three sample specimens were tested for each age. All research result data which has been obtained done by regression analysis nonlinier. Here in after is studied various correlation models of concrete mechanical property which has been tested. Based on correlation model analysis is obtained form of equation as follows :
y = abttcfc28, where for :
1. Compressive strength : a = 0,389 b = 0,996 c = 0,323
2. Modulus of elasticity : a = 353 b = 1,001 c = 0,083
3. Indirect tensile strength : a = 0,03 b = 1,002 c = 0,115
4. Modulus of Rupture : a = 0,052 b = 0,998 c = 0,224
The advantage of this correlation equation over the standard equation is the ability to analyze the mechanical properties of high performance concrete by function of time 0 < t 56 and has a smaller standard error
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