Batu bata merah merupakan bahan bangunan yang paling banyak digunakan di Indonesia. Umumnya digunakan sebagai bahan non-struktural dinding pembatas pada gedung. Pemanfaatan batu bata di Yogyakarta sampai saat ini tidak seimbang dengan kontrol kualitas yang ada dilapangan sehingga perlu adanya peningkatan kualitas produk yang dihasilkan. Tujuan dari penelitian ini adalah untuk mengetahui sifat fisik dan mekanik batu bata merah di Yogyakarta yang mengacu pada SNI 15-2094-2000. Benda uji diambil dari 10 tempat penjual batu bata di Provinsi Daerah Istimewa Yogyakarta untuk menganalisis sifat fisik dan mekaniknya. Pemeriksaan awal dilapangan yang dilakukan meliputi survey campuran tanah yang digunakan, lama pengeringan, jenis pembakaran dan metode pembakaran. Pemeriksaan fisik yang dilakukan meliputi analisa sifat tampak, ukuran bata merah dan kandungan garam. Pemeriksaan sifat mekanik yang dilakukan meliputi pengujian kerapatan semu, penyerapan, berat jenis, kadar air, Initial Rate of Suction, kuat tekan dan modulus elastisitas. Hasil analisis yang diperoleh kode sampel I memenuhi kriteria sifat fisik yang ditentukan, sedangkan pemeriksaan sifat mekanik memperoleh hasil yang bervariasi akan tetapi dari segi mutu kuat tekan tidak ada lokasi yang memenuhi mutu yang disyaratkan.
Excessive use of cement makes the price of construction projects expensive. Mortar making using high amounts of cement also has the potential to increase the price of the construction. This study discusses the use of agricultural waste as a substitute for cement in mortar production. The waste used in this study was bagasse ash, fuel ash palm oil, and rice husk ash. Each waste is added as much as 25%, 50% and 75% which are then tested for mechanical properties such as water content, unit weight, absorption, and IRS. Compressive strength was tested when the mortar was 28 days old with a cube-shaped specimen with a size of 50 mm x 50 mm x 50 mm. From the test results, it was found that all of this waste can be used as a substitute for cement. To produce a compressive strength of 100 kg/cm2 can add each waste with a percentage range of 10-12% of the weight of cement.
PurposeThis study aims to discuss the results of fresh properties and compressive strength of self-compacting concrete using ingredients added red brick powder as a fine aggregate substitute. The results of the study were compared with the properties of fresh properties and compressive strength with ingredients added by rice husk ash, which is also a fine aggregate substitute. In addition, the initial compressive strength of each of these variations was also examined to accelerate the completion time of construction projects using self-compacting concrete.Design/methodology/approachThis research was conducted in a laboratory by testing the characteristics of fresh and hardened properties of self-compacting concrete.FindingsFresh properties testing is carried out in the form of V-funnel, flow table, J-ring and L-box where all specimens produce quite varied flow rates. Compressive strength was estimated at ages 3, 7, 14 and 28 days with cylindrical specimens with a diameter of 150 mm and a height of 300 mm. The variation of fine aggregate substitutes used is 20, 40 and 60 per cent.Originality/valueFrom the results of the compressive strength, it can be concluded that the added material is categorized as self-compacting concrete with high initial compressive strength, while at 28 days, the compressive strength test results are categorized as high-strength self-compacting concrete.
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