This paper presents a numerical algorithm technique to detect cracks propagated in concrete beams based on the frequency response curve of the beam determined from vibration testing. Impact tests on simply supported reinforced concrete beams were conducted to measure vibration on the beam. The ICATS software was carried out to capture the Frequency Response Functions (FRFs) data at each load step. Utilizing the FRFs data, a numerical algorithm based on finite different methods was performed to compute the different FRFs between undamage and damage beams based on the mode shape curvature square (MSCS) method. The numerical damage location was defined by subtracting the MSCS undamage to damage of beams. Therefore, the accurate damage location was identified by comparing the numerical and observed experimental results.
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.
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.
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