The Modelling of Compressive Strength of Concrete on Discrete Element Method

Teknik pengukuran kualitas beton dapat dideteksi dengan mengetahui besarnya kecepatan perambatan gelombang ultrasonik. Dalam prosesnya, akurasi hasil pengukuran ditentukan oleh jarak transducer dan receiver, mutu material, impedansi akustik material, dan salah satunya homogenitas material. Hingga kini, metode yang populer digunakan adalah direct dan indirect untuk mengetahui kualitas material dan deteksi kerusakan pada beton. Salah satu kendala utama yang dihadapi adalah ketika kedua metode tersebut tidak dapat digunakan disebabkan kondisi eksisting Gedung. Skema uji semi-direct diusulkan untuk membantu menyelesaikan permasalahan yang tidak dapat dijangkau oleh metode direct dan indirect. Hasil akhir pengujian menunjukkan tingkat akurasi yang lebih rendah dibandingkan metode yang lainnya dengan selisih hasil pengujian 30%.

“…Gambar 5. Pengujian direct pada benda uji silinder 150 mm x 300 mm (tampak samping) [11] Besarnya nilai kecepatan perambatan gelombang dihitung dengan persamaan (2).…”

Section: Direct Testunclassified

Section: Uji Kuat Tekanunclassified

Section: Pengujian Kuat Tekan Betonunclassified

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Studi Eksperimen Non-Destructive Test dengan Metode Semi-Direct pada Beton

Ma’arif

Yasin

Haza

2022

“…As soon as it is put into the mold, fresh concrete is vibrated using a vibrating table to remove the culture cavity inside the concrete. The concrete then it is cured ASTM C31 after 24 hours [32]- [33]. The compressive strength test was carried out when the concrete was 28 days old.…”

Section: Mixing and Castingmentioning

confidence: 99%

The Optimum Vibration of the Compressive Strength of Concrete Specimen

Karisma

Candra

Ali

et al. 2022

Concrete is the primary material in construction, so it needs further research to get good quality concrete. The quality and durability of concrete are influenced by the amount and shape of the air cavity inside the concrete. With vibrating, the air that is inside the concrete will be lost. The benefits of vibration will only be achieved if planned and implemented with a suitable method. With proper vibration, the air in the concrete will come out and make porous concrete. Reduction or removal of air cavities will make concrete mixes strong with low permeability, increasing the durability of concrete. This study aims to determine the optimum strong vibrating on the compressive strength of Fc’ 21,7 Mpa concrete. Vibrating will be performed on cylinder concrete samples with a duration time of 3 minutes and with different variations in acceleration 160 m/s2, 170 m/s2, 180 m/s2, 190 m/s2, 200 m/s2, variation velocity 140 mm/s, 150 mm/s, 160 mm/s, 170 mm/s, 180 mm/s, displacement variation 600 mm, 800 mm, 1000 mm, 1200 mm, 1500 mm. Each variation consists of 7 concrete samples. These tests were performed with methods of external vibrating by using MBT Vibrating table CO-410 in fresh concrete. Compressive strength testing is carried out at 28 days. This study shows that the optimum strong vibrating with acceleration 180 m/s2, velocity 160 mm/s, and displacement 1000 mm with the resulting compressive strength is Fc’ 23.06 MPa. So that knowing the optimum vibration strength can be the basis for the implementation of vibration to get the planned concrete quality.

“…Berdasarkan hasil pengujian kuat tekan pada umur 7 hari didapat nilai rata-rata kuat tekan mortar geopolimer masing-masing variasi ditunjukan pada Tabel 4 dan Gambar 1. sehingga diketahui nilai kuat tekan tertinggi pada mortar geopolimer MGS70 yaitu 23.60 kg/cm 2 atau setara dengan 2.32 MPa, sedangkan nilai kuat tekan terendah pada mortar geopolimer MGS90 yaitu 6.39 kg/cm 2 atau setara dengan 0.63 MPa. Hal ini menunjukan bahwa kandungan silica fume sangat baik untuk bahan campuran mortar dibandingkan dengan [16].…”

Section: Kuat Tekan Mortar Geopolimer Umur 7 Hariunclassified

Analisis Kuat Tekan Mortar Geopolimer Berbahan Silica Fume dan Kapur Tohor

Riyanto

Widyananto

Renaldy

2021

Cement Portland is an essential ingredient in infrastructure development, but in portland cement production, there is a release of carbon dioxide (CO2). Innovation in materials in the construction of mortars, namely geopolymer mortars, is expected to reduce cement and air pollution. The research using experimental methods, aimed at locating the effect of the use of silica fume and quick lime with variations of silica fume: quick lime 90:10, 80:20, 70:30, 60:40, 50:50, using a cube mold of 5 x 5 x 5 cm as much as 120 items, for testing age 7, 14, 28 days. Research has a compressive strength with an optimum geopolymer mortar on a variation of silica fume: quick lime 70:30, which is 3.52 MPa at the age of 28. Based upon compressive strength results, apply the age of mortar 7, 14, 28 days known the longer a strong mortar age agency. Silica fume and quick lime may be used as alternative materials to replace cement. Based on ASTM C 270 to imply mortars type K and type O. ABSTRAKSemen portland merupakan bahan material penting dalam pembangunan khususnya di bidang teknik sipil, namun dalam proses produksi semen portland terjadi pelepasan karbon dioksida (CO2). Perlu adanya inovasi bahan dalam pembuatan mortar yaitu mortar geopolimer yang diharapkan dapat mengurangi penggunaan semen dan polusi udara. Penelitian ini menggunakan metode eksperimental, bertujuan mengetahui pengaruh penggunaan silica fume dan kapur tohor terhadap mortar geopolimer dengan variasi silica fume:kapur tohor 90:10, 80:20, 70:30, 60:40, 50:50, benda uji berbentuk kubus berukuran 5 x 5 x 5 cm sebanyak 120 benda uji, pengujian umur 7, 14, 28 hari. Hasil penelitian didapat kuat tekan optimum mortar geopolimer pada variasi silica fume:kapur tohor 70:30 yaitu 3,52 MPa pada umur 28 hari. Berdasarkan hasil kuat tekan pengaruh umur mortar 7, 14, 28 hari diketahui semakin lama umur mortar kuat tekan semakin meningkat. Silica fume dan kapur tohor dapat digunakan sebagai bahan alternatif pengganti semen. Berdasarkan ASTM C 270 termasuk dalam mortar tipe K dan tipe O.