Rr. M.I. Retno Susilorini
Soegijapranata Catholic University

Published : 5 Documents
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MODE I NON-LINEAR FRACTURE MODEL: CASES ON CONCRETE AND FIBER REINFORCED CONCRETE

Jurnal Teknik Sipil Vol 4, No 2 (2008)
Publisher : Jurnal Teknik Sipil

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Abstract

Mode I non-linear fracture model has been used widely to derive the values of stress intensity factorKSIc and crack tip opening displacement CTODc as fracture criterions for for concrete and fiberreinforced concrete. Some previous ode I non-linear fracture models of are Fictitious Crack Model byHillerborg, (1976), Crack Band Model by Bazant (1983, 1986), “Two-Parameters Model” by Jenq andShah (1986), “Mode I Crack Propagation Model” by Zhang and Li (2005), and “Non-local DamageModel” by Ferrara and Prisco (2005). This paper implements the theories of mode I non-linearfracture model on 2 cases. One case is implemented to concrete and another case is implemented tofiber reinforced concrete. Those two cases will derive the values of stress intensity factor KSIc andcrack tip opening displacement CTODc for each case. Case 1 is a case of concrete (without fiber)notched beam specimen of mode I non-linear fracture model and Case 2 is infinite fiber reinforcedconcrete of mode I non-linear fracture model. Case 1 resuls the values of stress intensity factor KSIc as15.078 MPa mm-1/2 and crack tip opening displacement CTODc as 0.023 mm. Case 2 resuls the valuesof stress intensity factor KSIc as 3.917.10-4 MPa mm-1/2 and crack tip opening displacement CTODc as–1.994.10-4 mm. In general, the fiber existence gives a great influence in deriving the analyticalsolution. This paper meet the conclusion as follows: (1) Mode I non-linear fracture model can be usedto derive the values of stress intensity factor KSIc and crack tip opening displacement CTODc asfracture criterions for for concrete and fiber reinforced concrete, (2) The fracture behavior of fiberreinforced concrete is specific compare to concrete because the existence of fiber bridgingphenomenon, (3) Calculating stress intensity factor KSIc and crack tip opening displacement CTODc,the result will be over-estimated if fiber traction is ignored, and it could be under-estimated if FPZ isignored, and (4) It is a good solution to combine Case 1 and Case 2 calculation together to get thevalues of stress intensity factor KSIc and crack tip opening displacement CTODc by considering theexistence of fiber in fiber-matrix composites.Keywords: mode I, non-linear, fracture, model, concrete, fiber reinforced concrete.

Efektivitas Uji Tidak Merusak Dan Uji Merusak Pada Dinding Bata Beton Hasil Perbaikan Dengan Additive Kimiawi Di Daerah Rawan Rob

G - SMART Vol 2, No 1: Juni 2018
Publisher : G - SMART

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Abstract

This research was conducted by using non-destructive test method and destructive test to investigatethe compressive strength of repaired concrete masonry wall with chemical additive sited at Sriwulan Village which is tidal flooding prone area and PucangGading Village. Non-destructive test using Hammer Test was conducted at age 12 months, 13 months, and 14 months after concrete masonry wall being repaired.It was found that in Sriwulan Village, the highest compressive strength is 49.37 MPa at age 14 month whilethe highest compressive strength value is on the in PucangGading is 50,51 MPa at age 13 month. It was also found that destructive test using Core Drill Test was conducted at age 14 month after the masonry wall have been repaired. The highest compressive strength in Sriwulan village was 58,6 MPa and in PucangGading was 82,63 MPa.

A Computer Modeling of Fracture Based Pull-Out of Nylon 600 Embedded in Cementitious Matrix

Civil Engineering Dimension Vol 11, No 2 (2009): SEPTEMBER 2009
Publisher : Institute of Research and Community Outreach - Petra Christian University

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Abstract

This paper reports the development of a computer model that represents a pull-out process of nylon 600 embedded in cementitious matrix. The model is based on fracture approach considering the Poisson’s effect and stable crack length. To back up the model four pull out tests of nylon 600 fiber, diameter 1.1 mm, with two fiber embedment lengths, 100 mm and 120 mm are done. The numerical approach is then compared to the experimental results. The computer model is built on Delphi 7 and named “Program Cabut-Serat Fraktur". This study shows that the computer model could represent the fracture phenomenon during the pull-out process.

Kinerja Rangkak pada Balok Beton Sandwich dengan Isian Styrofoam (Cement EPS Sandwich Panel)

G - SMART Vol 1, No 2 (2017)
Publisher : G - SMART

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Abstract

Precast material is a user-friendly construction product. One innovation that is being developed is sandwich concrete. Sandwich concrete is composed by skin layers, that are strong and stiff, and lightweight concrete as core layer. As a part of builiding construction, each structural and non-structural element resists load in certain time. The purpose of this research is to investigate creep performance of concrete sandwich beam. By observing the effect of creep, it can be known the long-term effect due to the constant loading on a material. The test specimen is formed of sandwich construction beam, with its core layer consists of lightweight concrete and styrofoam (cement EPS sandwich panel) mixture. This research conducted with two kinds of size and proportions of specimen, single beam (length=100 cm; width=20 cm; thickness=7,5 cm)and double beam (length=100 cm; width=20 cm; thickness=7,5 cm)which is a combination of single beams glued together with Sikabond. The loading method that used in this research is third point loading as described on ASTM C393 in two positions, horizontally and vertically. After having loaded of 3 kN in 2 hours, each test specimen has deflected and gives creep strain value. The values of creep strain are: specimen RH-S01 by 3,23%, specimen RV-S03 by 0,40%, specimen RH-D03 by 0,60%, dan specimen RV-D02 by 0,32%.The smallest value of creep strain obtained by double beam that was tested vertically, due to have greater EI value than the horizontally tested specimens. According to the maximum deflection and load that can be resisted by the specimens, sandwich concrete shall not be recommended for structural beam. This research shows that the creep effect of constant loading by 3 kN for 2 hours on sandwich concrete beam is not secure

Durabilitas Mortar Polimer Termodifikasi Alami dengan Amylum dan Bahan Tambah Madu

G - SMART Vol 2, No 1: Juni 2018
Publisher : G - SMART

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Abstract

The research aimed to investigate the durability of natural modified polymer mortar with amylum and honey admixture of aggressive environment that was modeled by 3 curing media, sea water, brakish water, and tidal flooding water. There were 855 specimens of mortar cubes with addition of amylum of 0,1%, 0,2%, 1%, 2%, and 5% and also honey of  0%, 0,03%, and 0,03%. All specimenswere cured and distributed into 3 curing medias for 7, 14, and 28 days. The result of this research met conclusion that optimum compressive strength was achieved by specimen with composition 0,1%  amylum and  0,03% honey that was cured by sea water.