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Ristinah Ristinah
Jurusan Teknik Sipil Fakultas Teknik Universitas Brawijaya
Civil Engineering, Building, Construction & Architecture

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Evaluation Of Reinforced Concrete’s Beam’s Capacity With Open Crack And Variation of Cover Thickness Using UPV And Hammer Test Saifoe El Unas; Sugeng P. Budio; M. Taufik Hidayat; Achfas Zacoeb; Ristinah Ristinah; Roland Martin S.; Christin Remayanti N.; Ahmad Rizqol Mahbub
Rekayasa Sipil Vol 7, No 3 (2013)
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Brawijaya

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Abstract

Defect in building’s structure can be analyzed by non-destructive method or NDT, such as UPV Test and hammer test. Furthermore the UPV, hammer test, compressive strength test, flexural test and statistical analysis show the accuration of quality test result with the NDT method. The specimen used is brick-formed with the dimension of 15x20x140 cm and the variation of cover thickness. Average relative error of hammer test of cylinder test is about 2,83% - 7,32%. While UPV’s average relative error of cylinder sample is 4,74% - 55,05%. Based on statistical analysis, hammer test shows there is no significant difference, while UPV test shows that there is significant difference. Calculation of compressive strength before and after flexural loading obtains a number of relative error, in hammer test 5,58% - 10,53% and UPV test 7,35% - 13,05%. 
The Effect Of Variation of Pyrophyllite Addition To Compressive Strength, Porosity, And Diagram of Stress Strain In Burnt Lightweight Concrete Brick Ristinah Ristinah; Retno Anggraini; Achfas Zacoeb; Prastumi Prastumi; Krisna Febrian Anugerahputra; I Dewa Nyoman Yoga Prawira
Rekayasa Sipil Vol 7, No 3 (2013)
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Brawijaya

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Lightweight brick is a material widely used in civil engineering as a substitute alternative material and brick walls of the building material. The aim of this study is to determine the behavior of burnt light brick, and behavior of piropilit additions in the mix proportion of the light brick. Specimens were tested by compressive strength, porosity, and modulus of elasticity. To test the compressive strength, plates were set at the top and bottom of the test specimen; a dial gauge was used to determine the deformation. To test the porosity, the specimen was cut into a size of 15 x 20 x 10 cm 3 and tested in accordance with porosity testing procedures. Data for the elastic modulus was obtained from stress and strain testing in conjunction with the compressive strength test. After the age of 28 days, specimens undergo combustion process before tested in the laboratory. Results of this study show that the addition of amount of piropilit as filler as much as 10-25% by weight of cement will increase the strength of brick light post-combustion at 800 o C temperature along with the increasing number of additional piropilit in it, however the addition of 5% would reduce the value of compressive strength. The addition of piropilit in the burnt lightweight brick will decrease the value of the strength. Porosity and modulus of elasticity values indicate that the addition of a filler piropilit as much as 515% by weight of cement on the burnt brick would increase the value of its porosity, however the addition of 20% and 25% would reduce the value of porosity. The modulus of elasticity values obtained from the stress and strain diagram, an increase of 5% -25% variation pyrophyllite additions. However there are some fluctuation trends on a variation of 5% -20% due to piropilit characteristics that do not fit to undergo the process of combustion or due to the setting position of the specimen in the furnace when the combustion process which allows the specimen exposed to direct flame or not. 
The Effect Of Pyrophyllite Use As Admixture In Light Concrete Bricks’s Mechanical Properties Retno Anggraini; Ristinah Ristinah; Sugeng P. Budio; Stevanus Rony Soewignyo; Winny Firmaninda
Rekayasa Sipil Vol 7, No 3 (2013)
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Brawijaya

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Abstract

Pyrophyllite was extracted from Greek Language, in which pyt means fire and phyllon means leaf or sheet. Otherwise, phylit was found not long after phyllon word, in which the meaning was crack’s sheet. Pyrophyllite is combination of silica alumunium that has chemical formula Al2O3.4SiO2H2O. In this research, testing was conducted for mechanical properties of light concrete brick provided by additional material ”Pyrophyllite stone” as additive. The mechanical properties of light concrete brick consist of compressive strength, porosity, stress and strain curve, and elastic modulus. Testing resultsof the light concrete brick will be compared with that without mix of Pyrophyllite additive. 
Co-Authors Achfas Zacoeb Ahmad Rizqol Mahbub Christin Remayanti N. I Dewa Nyoman Yoga Prawira Krisna Febrian Anugerahputra M. Taufik Hidayat Prastumi Prastumi Retno Anggraini Roland Martin S. Saifoe El Unas Stevanus Rony Soewignyo Sugeng P. Budio Winny Firmaninda