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Implementation of Reinforced Concrete Floor Beams and Plates in a 5-Storey Hospital Building Construction Project Rosiyani, Tissa Rahayu; Kristiawan, Agung; Suwandi, Putri Anggi Permata
International Journal of Sustainable Building, Infrastructure and Environment (IJOSBIE) Vol 6, No 2 (2025)
Publisher : Science and Technology Research Centre, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/ijosbie.v6i2.22425

Hospitals are health care institutions that provide a full range of individual health services and provide inpatient, outpatient and emergency services. The comprehensive health services referred to in this case include promotive, preventive, curative and rehabilitative.[1] The construction of the new building at PKU Muhammadiyah Blora Hospital will be the center of the physiotherapy clinic, pharmaceutical satellite, commercial area, drop off, ICU, inpatient, office. The existence of the new building is a step to improve the quality of health services for patients. The new hospital building is located to the east of the main building in the PKU Muhammadiyah Blora Hospital complex. The work observed is the work of beams and reinforced concrete floor slabs. This work has several steps of workmanship. The work on the beams and floor slabs must complete the reinforcement and formwork simultaneously first, then the casting can be done.

Six Sigma-DMAIC (Define, Measure, Analyze, Improve, And Control) Analysis in Reducing Building Structural Defects (Case Study: Emirates Indonesia Cardiology Hospital Project) Mustika, Risti; Suwandi, Putri Anggi Permata; Kristiawan, Agung
International Journal of Sustainable Building, Infrastructure and Environment (IJOSBIE) Vol 6, No 2 (2025)
Publisher : Science and Technology Research Centre, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/ijosbie.v6i2.24619

Abstract. Construction projects often face challenges in maintaining quality, one of which is structural defects that can affect the quality and safety of the building. This study aims to analyze the level of defects in column, beam, and slab structures using the Six Sigma DMAIC method and provide solutions to improve these defects. The study was conducted on the Emirates Indonesia Cardiology Hospital Building Construction Project in Surakarta. The method used is a quantitative descriptive approach with the stages of Define, Measure, Analyze, Improve, and Control. Data were obtained through field observations, interviews, documentation, and secondary project data. The analysis results show that the average sigma level value is above 3, with the highest level in the column structure reaching 4.3 sigma for the type of concrete flow defect. The main causes of defects come from human factors, work methods, materials, and supervision. Improvement solutions are formulated using a fishbone diagram analysis approach and the assistance of NVIVO software for qualitative data analysis. This study shows that the Six Sigma DMAIC method is effective in identifying and reducing defects in concrete structure work and can be used as a quality control strategy in construction projects.Keywords: Six Sigma, DMAIC, Structural Defects, Construction Quality, NVIVO

ACCESSIBILITY OF TRANSPORTATION FACILITIES FOR DISABILITIES (CASE STUDY OF TRANS SEMARANG) Suwandi, Putri Anggi Permata; Saputro, Bayu Singgih; Hermanto, Wilarso; Kristiawan, Agung
International Journal of Sustainable Building, Infrastructure and Environment (IJOSBIE) Vol 1, No 2 (2020)
Publisher : Science and Technology Research Centre, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/ijosbie.v1i2.6998

Accessibility related to public transport is a means of advancing the economic welfare of the community, creating and increasing economic degrees, as well as a precursor sector of other sectors. Therefore, people with disabilities are also entitled to the same service to the public transportation as an effort to realize similarities, the equality of citizens and the enhancement of the role of disability. This research aims to analyse disability access and the role of the transportation service of Semarang and PT. Trans Semarang on Bus Rapid Transit in Semarang City. This research uses a type of qualitative approach that is implemented through interviews, observations and documentation. The conclusion of this research shows that from the regulatory aspects, the government of Semarang should be appreciated because the government of Semarang has tried to fulfill the rights of the disabled. But from the implementation aspect, there needs to be an improvement because the accessibility of disabled people running optimally can be seen through the condition of public facilities in the city of Semarang. Public facilities in the city of Semarang do not completely ignore the reference accessibility means there are public facilities that have been good enough but many more are not optimal.

REWORK COST ANALYSIS ON COLUMN WORK IMPLEMENTATION METHODS "CASE STUDY: CONSTRUCTION PROJECT OF HOSPITAL ROEMANI MUHAMMADIYAH PARKING BUILDING SEMARANG" Suep, Muhamad; Husodo, Ibnu Toto; Suwandi, Putri Anggi Permata; Kristiawan, Agung
International Journal of Sustainable Building, Infrastructure and Environment (IJOSBIE) Vol 3, No 1 (2022)
Publisher : Science and Technology Research Centre, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/ijosbie.v3i1.12980

The word of construction is no stranger to rework. In the course of the implementation of construction, rework work may occur which can cause delays in the work process and swelling of the project cost budget. This can be influenced by several problems or factors that are often encountered during development work such as human resourse factors, documentation and disign, managerial with this can be from sevaral that have been mentioned that must be considered when planning construction development. In this study using descriptive research that directly takes data in the field by means of interviews, documentation, observation in order to be able to answer the research objectives properly and correctly according to the data obtained from the aforementioned data collection process. So that it can be seen the most frequently encountered rework jobs in the field. Based on the results of the study, it was shown that the dominant factor causing rework was managerial factor. The type of work that often experiences rework work is the finishing work of the second floor column casting. With the details of the causes of rework, the results obtained are design and documentation 22.5%, managerial 40.4%, and human resources 37.2%. The process of rework in the construction of the R S Roemani Semarang building can be concluded that there are several problems or identification of rework, namely porous columns, column slopes and column centring.

Analysis of Impact Contract Change Order (CCO) on Time & Cost (Case Study : Counterweight and Tano Ponggol’s Channel Project in Samosir Regency) LARASATI, ENDAH; SHOLIKIN, YUDHA ALFANDA MUHAMMAD; KRISTIAWAN, AGUNG
International Journal of Sustainable Building, Infrastructure and Environment (IJOSBIE) Vol 6, No 1 (2025)
Publisher : Science and Technology Research Centre, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/ijosbie.v6i1.22423

In many projects, changes often occur due to on-site conditions. These changes are made to ensure that the work can be carried out properly and in accordance with actual field requirements. Typically, such changes—whether additions, reductions, or replacements—lead to modifications in the contract documents. These modifications result in a Contract Change Order (CCO), which can affect several aspects of the project.This study aims to analyze the impact of Contract Change Orders (CCOs) on project duration and cost, using the Counterweight and Tano Ponggol Channel Project in Samosir Regency as a case study. The results of the study indicate an increase in project duration by 175 days. In terms of cost, the CCO led to a reduction in the counterweight work budget from IDR 25,018,491,000 to IDR 18,768,883,000.

Implementation of Reinforced Concrete Floor Beams and Plates in a 5-Storey Hospital Building Construction Project Rosiyani, Tissa Rahayu; Kristiawan, Agung; Suwandi, Putri Anggi Permata
International Journal of Sustainable Building, Infrastructure and Environment (IJOSBIE) Vol 6, No 2 (2025)
Publisher : Science and Technology Research Centre, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/ijosbie.v6i2.22425

Hospitals are health care institutions that provide a full range of individual health services and provide inpatient, outpatient and emergency services. The comprehensive health services referred to in this case include promotive, preventive, curative and rehabilitative.[1] The construction of the new building at PKU Muhammadiyah Blora Hospital will be the center of the physiotherapy clinic, pharmaceutical satellite, commercial area, drop off, ICU, inpatient, office. The existence of the new building is a step to improve the quality of health services for patients. The new hospital building is located to the east of the main building in the PKU Muhammadiyah Blora Hospital complex. The work observed is the work of beams and reinforced concrete floor slabs. This work has several steps of workmanship. The work on the beams and floor slabs must complete the reinforcement and formwork simultaneously first, then the casting can be done.

COST EFFICIENCY ANALYSIS AND RISK MANAGEMENT OF THE SELFMANAGED BATCHING PLANT METHOD MUSI TOLL KAYU AGUNGPALEMBANGBETUNG BRIDGE PROJECT Supriyono, Joko; Kristiawan, Agung; Ramadhani, Vicha Silviana; Suwandi, Putri Anggi Permata
International Journal of Sustainable Building, Infrastructure and Environment (IJOSBIE) Vol 7, No 1 (2026)
Publisher : Science and Technology Research Centre, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/ijosbie.v7i1.27063

This study was conducted on the Musi Bridge Project of the Kayu Agung–Palembang–Betung Toll Road to determine the most efficient and controlled concrete supply method, considering the high proportion of concrete costs, potential distribution delays, and structural quality requirements in strategic infrastructure projects. The research aimed to compare the self-managed batching plant method and the ready-mix method in terms of cost efficiency, technical and non-technical risks, and concrete quality performance. A quantitative descriptive-comparative approach was applied using primary data from project documents, including cost summaries, material quantities and prices, job mix formulas, risk matrices, and quality testing reports, supported by field observations. The analysis involved cost calculations, risk scoring and categorization, and evaluation of compliance with technical specifications. The results show that the self-managed method achieved cost savings of 15.7% and lower risk levels compared to the ready-mix method, while both methods met structural quality requirements. Therefore, the study concludes that self-managed batching plants are more effective for large-scale projects when supported by adequate technical and operational capacity. Keywords: concrete supply method, self managed batching plant, ready-mix concrete, cost and risk analysis ;

Six Sigma-DMAIC (Define, Measure, Analyze, Improve, And Control) Analysis in Reducing Building Structural Defects (Case Study: Emirates Indonesia Cardiology Hospital Project) Mustika, Risti; Suwandi, Putri Anggi Permata; Kristiawan, Agung
International Journal of Sustainable Building, Infrastructure and Environment (IJOSBIE) Vol 6, No 2 (2025)
Publisher : Science and Technology Research Centre, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/ijosbie.v6i2.24619

Abstract. Construction projects often face challenges in maintaining quality, one of which is structural defects that can affect the quality and safety of the building. This study aims to analyze the level of defects in column, beam, and slab structures using the Six Sigma DMAIC method and provide solutions to improve these defects. The study was conducted on the Emirates Indonesia Cardiology Hospital Building Construction Project in Surakarta. The method used is a quantitative descriptive approach with the stages of Define, Measure, Analyze, Improve, and Control. Data were obtained through field observations, interviews, documentation, and secondary project data. The analysis results show that the average sigma level value is above 3, with the highest level in the column structure reaching 4.3 sigma for the type of concrete flow defect. The main causes of defects come from human factors, work methods, materials, and supervision. Improvement solutions are formulated using a fishbone diagram analysis approach and the assistance of NVIVO software for qualitative data analysis. This study shows that the Six Sigma DMAIC method is effective in identifying and reducing defects in concrete structure work and can be used as a quality control strategy in construction projects.Keywords: Six Sigma, DMAIC, Structural Defects, Construction Quality, NVIVO

Analysis of The Effect of Change Orders on Implementation Time and Construction Labor Costs in The Development Project of The Joint Lecture Building III at Unimus Rinaldi, Bramantyo; Suwandi, Putri Anggi Permata; Kristiawan, Agung
International Journal of Sustainable Building, Infrastructure and Environment (IJOSBIE) Vol 6, No 1 (2025)
Publisher : Science and Technology Research Centre, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/ijosbie.v6i1.21537

Change orders resulted in a total time deviation of 45 days (18.75%) from the initial plan, with the most substantial delays in structural and MEP work. Regarding labor costs, MEP work experienced the largest deviation at 25% (IDR 150,000,000), followed by foundation work (16.67%), structural work (15%), and architectural work (10%). Change orders also impacted labor productivity, particularly in MEP work (-25%), followed by foundation (-16%), structural (-12.5%), and architectural work (-12.5%). These productivity decreases resulted from changes in work methods, increased complexity, and adaptation requirements to new specifications. The study recommends several measures to minimize change order impacts: more thorough design reviews before implementation, allocation of time and cost buffers, improved documentation and approval systems, and more flexible workforce planning. Effective change order management is crucial for maintaining overall project success.

ANALISIS KUAT TEKAN BETON MUTU K 200 DENGAN BAHAN CAMPUR FOAMING AGENT, SUPERPLASTICIZER (SIKACIM), DAN FLY ASH Prandika, Nofvim Eric; Azzahra, Synsya Ealiah; Kristiawan, Agung; Anggi P. S., Putri
Jurnal Teknik Sipil Giratory UPGRIS Vol 6, No 1: Juni 2025
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/giratory.v6i1.24095

Concrete technology innovations need to be made to improve or correct weaknesses and improve the quality standards of the concrete produced. The technology and innovation that has been developed is lightweight concrete. This research aims to find lightweight but high compressive strength concrete (optimal concrete) at K200 concrete grade. With mixed materials for concrete in the form of foam agent, superplasticizer, and fly ash, the tolerance limit for mixing materials at the age of 14 days and 21 days of concrete with experimental methods with cube-shaped samples. Based on the purpose of this study, namely looking for lightweight concrete but high compressive strength (optimal concrete) in this study the average foam 15%, superplasticizer 1.5, fly ash 10% age 14 days with an average of 254.74 kg / cm² and average foam 15% superplasticizer 1.5%, fly ash 10% age 21 days average compressive strength 225.87 kg / cm².

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