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All Journal Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil
Mochammad Tri Rochadi
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Transportation

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Pengaruh Variasi Penambahan Limbah Plastik Terhadap Kekuatan Tekan Batako Dalam Upaya Pemanfaatan Limbah Kusdiyono Kusdiyono; Supriyadi Supriyadi; Mochammad Tri Rochadi; Herry Ludiro Wahyono
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 23, No 2 (2018): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v23i2.1362

Abstract

At this time, plastic is a material that is needed by the public at large and the impactis also extraordinary after the plastic is used in daily life which can cause seriousproblems if the management is not done properly. The problem of plastic waste doesnot only occur in the city of Semarang, but also in other cities, so the Ministry ofEnvironment and Forestry has implemented a pay-for-use plastic bag program inthe short term. But this is only to deal with problems in the short term. In the longterm, it will not solve the problem of "plastic waste", because the policy actuallyencourages people to buy plastic that is of course will add a new burden to thepeople to buy it. The results showed that the compressive strength of a hollowconcrete brick (brick) with a model / type BN d.d. B1,0 there is a decrease in theaverage compressive strength. The highest at the addition of 0.10% withcompressive strength on average reached 35.21 kg / cm², in general the decreaseoccurred in the addition of plastic each different from 0.10% to 1.0% of the weightof sand with the lowest compressive strength of 21 , 16 kg / cm². Regressionequation obtained Y = - 0.119 X² + 0.008 X + 35.53 with a correlation value of R² =0.987, meaning that with the addition of plastic has a very strong influence oncompressive strength. So that it can be obtained an illustration that by addingplastic to the manufacture of hollow concrete brick (brick) can affect thecompressive strength decreases. Despite the decline, the quality of the brick is stillgood and above the lowest quality Level IV with compressive strength above 2.0MPa which may still be made with variations Plastic with a composition greaterthan 1% or comparative composition of Portland Cement (PC) with sand is mademore small (<1 PC: 7 Sand), with the hope that this Plastic waste can be utilizedoptimally.Kata kunci : plastic waste, brick making, waste utilization
Analisis Penjadwalan Kegiatan Preventive Maintenance Ac Split Gedung Pusat Pdam Tirta Moedal Semarang Charisma Suminto; Fela Rasti Chesa Amilia; Mochammad Tri Rochadi; Martono Martono
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 19, No 2 (2014): WAHANA Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v19i2.134

Abstract

The usage of air conditioner or air conditioner machine is a necessity for daily life. An office building, which has many rooms, needs more air conditioner (AC) as an attempt to fulfill comfort necessity to the rooms usage in the office building. By operating a large number of air conditioner, it requires a preventive maintenance system (preventive maintenance) that can give preventive act which is hoped being capable to keep the function and performance of the air conditioners functioning optimally. AC split preventive maintenance can be distinguished into 2 activities, they are small scale activity by cleaning the filter, the indoor part, the dust, etc, and then large scale preventive activity by doing complete cleaning to both outdoor and indoor components. At the building of PDAM Tirta Moedal Semarang, the preventive maintenance activities have had been undertaken by service provider vendor. All this time, the scheduling was not well-structured, so the activities which are undertaken by vendor are uncontrollable. To solve that problem, it needs analysis about the scheduling of preventive maintenance. Analysis is undertaken by looking for the tendency of treatment by classifying based on the capacity of the AC split. Based on this activity, it obtains the largest percentage treatment at interval 3 months, 1 pk (70.59%), and 2 pk (76.67%). These tendencies are used to arrange the new large scale preventive maintenance schedule, whereas the small scale scheduling is planned using literature study. The comparison of Budget Plan is used to compare between the result of the new scheduling and the earlier scheduling activity.
Kajian Kenyamanan Termal Ruang Kuliah Pada Gedung Sekolah C Lantai 2 Politeknik Negeri Semarang Demi Tria Istiningrum; Rr leidy Arumintia; Muhamad Mukhlisin; Mochammad Tri Rochadi
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 22, No 1 (2017): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v22i1.895

Abstract

In carrying out the activity, people are generally want a comfortable condition. One of the physical environmental factors that affect the level of comfort when working is thermal comfort. Thermal comfort is the feeling that someone is comfortable withthe condition of the environment temperature, which is described as a condition where a person does not feel too hot or too cold in specific environments. Things that influence the thermal comfort is air temperature, humidity, wind speed, insulant clothing value and rate of metabolic. The study was conducted in lecture room State Polytechnic of Semarang, 4 rooms on the 2nd floor have been selected as the object in this study because those rooms are located at the east and the west of building and still using natural ventilation, those rooms are SC II-01, SC II-02, SC II-09 and SC II-10. This study was conducted to determine how the level of thermal comfort in the classroom. The method used in this research is PMV (Predicted Mean Vote) and PPD (Predicted Percentage of Dissatisfied). PMV is used to determine the comfort level of student as users of the room, while the PPD is used to determine the level of student dissatisfaction as users of the room. From the results obtained in mind that the three classes in he category of heat that is SC II-01, SC II-02 and SC II-09. While another class, namely SC II-10 into the warm category.Kata kunci : PMV, PPD, Thermal Comfort, Lecture Room, Classroom
Kajian Eksperimen Pengaruh Penambahan Silica Fume Terhadap Sifat Adhesif Untuk Perbaikan Keramik Dinding Dika Pratama; Rizki Febri Astuti; Mochammad Tri Rochadi; Kusdiyono Kusdiyono
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 23, No 1 (2018): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v23i1.1352

Abstract

The release of ceramics is an undesirable event, one of the causes is the presence of trapped air which causes the area attached to the wall to decrease. To reduce this, additional ingredients / smaller silica fume additives (<1μm) can be used to fill the hollow part. The purpose of this study was to measure and compare the properties of ceramic adhesives with and without the addition of silica fume to ceramic adhesives, and to determine the percentage of addition of silica fume to obtain the most optimal adhesive strength. The method used is an experimental method in the laboratory by conducting tests of ceramic adhesion based on ASTM C 482-02 and SNI 03-4877-1998. The level of addition of silica fume used is 5, 10, 15, and 20% of the weight of cement. The test results show that there is a "very strong" relationship between the addition of silica fume and ceramic adhesive properties in increasing the strength of the adhesive power as evidenced by correlation analysis with an R2 value of 0.9042. The strength of the adhesive power of ceramics without silica fume as a control variable is 1.4146 MPa, while the strength with a mixture of silica fume is 1.8051 MPa, 1.9606 MPa, 1.8811 MPa, and 1.5666 MPa, respectively. The regression analysis showed that the highest / optimum strength was achieved when the proportion of silica fume addition was 10.8% of the weight of cement with a sticky power strength value of 1.9637 MPa or an increase of 38.82% on the control variable which did not use the added silica fume material.Kata kunci: Sifat adhesif keramik, daya rekat keramik, silica fume.
Co-Authors Charisma Suminto Demi Tria Istiningrum Dika Pratama Fela Rasti Chesa Amilia Herry Ludiro Wahyono Kusdiyono Kusdiyono Martono Martono Martono Martono Muhamad Mukhlisin Rizki Febri Astuti Rr leidy Arumintia Supriyadi Supriyadi