Sifat Mekanis Beton Beragregat Artifisial Ringan

Beton adalah material yang terdiri dari agregat kasar dan halus dan semen. Agregat memiliki porsi tertinggi kurang lebih 70 persen volume beton. Agregat didapat dari alam, namun untuk beberapa daerah ketersediaan agregat sangat terbatas dan mencegah kerusakan lingkungan akibat eksploitasi sumber daya alam, maka posisi agregat kasar pada beton dapat digantikan oleh agregat arifisial, yang terdiri dari fly ash, kapur, silica fume dengan metode cold bonded. Agregat yang dihasilkan berbentuk pellet dan berukuran 10 sampai 20 mm proporsi yang tepat untuk bahan campuran 70 persen fly ash, 30 persen kapur dan penambahan sebesar 25 persen silica fume dari berat kapur. Pengujian agregat artifisial meliputi pengujian impak, keausan, berat volume dan berat jenis. Nilai impak adalah sebesar 18,83 persen dan nilai keausan adalah sebesar 55,97 persen. Pengujian beton dengan agregat artifisial menghasilkan nilai kekuatan tekan rata-rata pada usia 28 hari sebesar 32 MPa. Beton dengan agregat artifisial memiliki berat jenis lebih ringan dibandingkan dengan beton normal. Agregat artifisial memiliki berat jenis sebesar 1,85 gram/cm3 sehingga agregat artifisial memiliki berat jenis 44 persen lebih ringan bila dibandingkan berat jenis agregat kasar alami. ============================================================ Concrete is a material made from coarse and fine aggregates besides cement and water as the binder. These aggregates form the highest portion of approximately 70 percent of the total volume of concrete. Normally, aggregates are obtained from natural resources. However, some areas have only very limited supply of aggregates. To prevent the environmental damage from this aggregate exploitation from its natural resources, the natural aggregates of the concrete can be replaced by the artificial ones consisting of fly ash, lime, silica fumes, etc. It can be produced by several methods and one of them is by the cold-bonded method. The resulting aggregates made by this method are the pellet-shaped aggregate with the size of 10 to 20 mm. The mixture proportion of this aggregate consists of 70 percent fly ash, 30 percent lime, and additional 25 percent silica fume of the lime weight. The mechanical properties and characteristics of the artificial aggregate was investigated which include the impact, abrasion, volume weight, and specific gravity tests. The impact and abrasion test values were found to be 18.83 and 55.97 percent, respectively. The concrete compressive test using artificial aggregate has the average value of 32 MPa at the age of 28 days. Concrete with artificial aggregate has much lower density than normal-weight concrete. The artificial aggregate has a density of 1.85 gram/cm3 such that it is 44 percent lighter than the natural coarse aggregate