Main Article Content
Abstract
The availability of the sand in the coastal regions enable the society nearby to use it directly as one of the material of the concrete building. The coastal fine sand with round surface, and uniform grading will reduce the interlocking among the granules. The sand of each region on the coast of Bengkulu visually have different characteristics, also if compared with river sand and mined sand, especially the fineness of the grain. The level of the grain fineness can be seen
from the grain fineness modulus. This study aims to find out the use of the coastal sand of different fineness to the strength of concrete, as well as the effect of concrete curing by using sea water and fresh water to the strength of the concrete. The coastal sand used in this study was taken from North Bengkulu areas namely Lakok beach, Sentolong beach and Air Padang beach. Each of the sands visually are different in color and grain size. As the comparator, river sand and mined sand are used. The designed samples are concrete cube with dimensions of 15 cm, water to cement ratio of 0.5 and 50-120 mm slump. The test was conducted at 28, 56 and 90 days of the concrete ages. The results showed that the usage of the sand in concretematerials can provide a positive outcome for the coastal sand with coarse gradations and modulus of grains. The usage of Lakok beach sand in concrete test results show that for any age of the concrete samples, the concrete compressive strength are the highest, even exceeds the compressive strength of the concrete using river sand and mined sand. Air Padang beach sand has the finest gradation and produces concrete samples with the lowest compressive strength. The concrete cured by submersion in sea water has lower compressive strength of the concrete compared to the concrete cured by submersion in fresh water.
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References
Amri, S. 2005. Teknologi Beton A-Z. Yayasan John Hi Tech Idetama,
Jakarta.
Aras, A.H., Taufieq, N.H.S., dan Ahmad, I.S. 2009. Analisis Pengaruh
Temperatur Terhadap Kuat Tekan Beton. Jurnal Teknik Sipil Vol 16 No
Universitas Negri Makasar, Makasar.
Cornelis, R., Ramang, R., dan Kandi, Y.S. 2012. Subtitusi Agregat Halus
Beton Menggunakan Kapur Alam Dan Menggunakan Pasir Laut Pada
Campuran Beton. Jurnal Teknik Sipil Vol 1 No4. FTS Udana, Nusa
Tenggara Timur.
DPU. 1990. Tata Cara Pembuatan Rencana Campuran Beton Normal,
SK-SNI-T-15-1990-3. Departemen Pekerjaan Umum Yayasan Badan
Penerbit Pekerjaan Umum, Jakarta Kandi, YS., dkk. 2012. Subtitusi Agregat halus Halus Beton Menggunakan Kapur Alam dan Menggunakan
Pasir Laut Pada Campuran Beton, puslit2.petra.ac.id/ejournal/index.php/
jjjurnal-teknik-sipil/.../18580 Mangerongkonda, D. 2007. Pengaruh
Penggunaan Pasir Laut Bangka Terhadap Karakteristik Kualitas
Beton, http://library.gunadarma.ac.id/10399066-jurnal.ftsp.pdf
Mulyono., T. 2003. Teknologi Beton, Andi Offset, Yogyakarta.
Murdock, L.J., dkk. 1999. Bahan dan Praktek Beton. Erlangga, Jakarta.
Nugraha, P. Teknologi Beton, Dari Material, Pembuatan, ke Beton
Kinerja Tinggi. Andi Offset,Yogyakarta.
Siregar, A. Husin, dkk. 2008. Pemanfaatan Pasir Pantai Sepempang dan BatuPecah Asal Ranai Sebagai Bahan Pembuatan Beton Normal. Forum
Teknik Sipil No. XVIII/1-Januari 2008. Universitas Gadjah Mada :
Yogyakarta