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All Journal JURNAL KARYA TEKNIK SIPIL
Han Ay Lie
Jurusan Teknik Sipil FT. UNDIP Jl. Prof. H. Soedarto SH., Tembalang, Semarang 50275
Civil Engineering, Building, Construction & Architecture

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PENGARUH KOMPOSISI NANO SEMEN TERHADAP KUAT TEKAN MORTAR Dion Aji Fadlillah; Frisky Sustiawan; Han Ay Lie; Purwanto Purwanto
Jurnal Karya Teknik Sipil Volume 3, Nomor 4, Tahun 2014
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Abstract

The micro voids in the cement paste of cementitious material drastically reduce the load-carrying capacity of the element, due to the reduction in area. On the other hand, the weak interface between aggregates and mortar induces micro-crack initiation and promote crack propagation. It therefore becomes curial to reduce the voids in the mortar, and promotes a better hydration degree of cement. A method that has been proven effective is the use of nano-cement particles. The smaller cement particles will result in a better hydration process, and create less large ettringites and calcium hydrates. This research work studied the effect of nano-cement percentage in the mortar mix by the substitution method. The ratio in weight of the nano-cement with respect to the normal cement ranged from 0%, 20%, 40%, 60%, 80%, to 100%. The specimens sized 50 × 50 × 50 mm were tested at the age of 28 days to obtain their compression strength. The cement-to-sand proportion was 1 to 2.75, while a water-cement-ratio of 0.485 was maintained throughout the experiments. Two cement types, PCC (Portland Composite Cement) and PPC (Portland Pozzolane Cement), all Indonesian based products, were compared to obtain a picture of the overall cement condition in Indonesia, and the effectiveness of the nano-cement use to each of the types.
PENGARUH JARAK DAN VARIASI PENEMPATAN MULTI-INKLUSI BERBENTUK LINGKARAN TERHADAP PERILAKU BETON Anastasia Yesica; Rakhma Nurfitriani Editia; Rudi Yuniarto Adi; Han Ay Lie
Jurnal Karya Teknik Sipil Volume 4, Nomor 4, Tahun 2015
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Abstract

The stress-strain response of the basic concrete making material, i.e. the mortar and aggregates, are well known. In general, the aggregate behaves linearly up till failure, possessing a very high ultimate compression strength and stiffness. The behavior of mortar is non-linear, even at low loading levels. The resulting composite material, the concrete, exhibits a less stiff response, in combination with degradation in strength. This study looked into the influence of the centroid distance and configuration of a 100x100x50 mm mortar specimen. Two inclusion configurations were considered, parallel and diagonal to the line of loading with the distance variety. It was shown that the centroid distance and configuration strongly influenced the strength, the stiffness, and failure mode. The strength behavior had a minimum and a maximum bifurcation point, while the stiffness response increased, as a function of an increase in the inclusion-to-specimen volume ratio. Visual observation of the cracking pattern revealed that the initial cracking was always situated at the interface between the aggregate and mortar in tension and propagated through the mortar matrix. It was also perceived that the crack propagation path of the very dense, diagonally arranged inclusions deviated from the columnar configuration observed from the parallel inclusion formation.
Co-Authors Anastasia Yesica Dion Aji Fadlillah Frisky Sustiawan Purwanto Purwanto Rakhma Nurfitriani Editia Rudi Yuniarto Adi