The success factors of project was completing the project without time delay and cost overrun. Time delay and cost overrun were arised due to uncertainty activity during the life cycle project. This may lead the problems to the project. The research aim was analysing cost overrun and time delay in construction project. Data were collected using questionnaire to 36 respondent. 15 factors have been identified in this research i.e land acquisition delay, location of site, support or protest from the local for the project, changes in design specifications, rework, subcontractors and vendors performance, delay in works approval, inaccurate budgeting and resource planning, price escalation of materials, rules and regulations of the government, owners additional required, inflation, payment delay, weak cash flow and bad weather. The result findings, owners and contractors have differences and similarty perception. In cost overrun factors, owner agreed the topmost factor causing was owner additional required while according to the contractors was rework. In delay factors, owner agreed the topmost factor causing delay was inaccurate budgeting and resource planning while according to the contractors was land acquisition delay. Nevertheless, both parties agreed the inflation has a least influent to construction project delay.

Cost overrun is one of the problems faced by most construction projects in Indonesia. The unexpected budget in cost overrun can raise many problems in the project. Hence, it is important for every stakeholder in the project to have a good understanding of the factors causing cost overrun to avoid or to minimize the risk of it in the project. The aims of this study are to identify factors causing cost overrun in a project and to analyze factors that most influence the occurrence of cost overrun in construction projects in Indonesia as perceived by the owner and contractor. This research used a questionnaire to collect data. 15 factors were identified in this research i.e. site availability delay; site conditions; social site conditions; change order; rework; subcontractor and/or vendor performance; approval/permit delay; inaccuracy in budgeting; scheduling and resource planning; materials price fluctuations; rules and regulations; owner additional requirements; inflation; delay in payment; weak cash flow and bad weather. From a total of the 15 factors identified, both parties agreed on rework as the most factor causing cost overrun in construction projects in Indonesia.

Time delay in construction projects causing not only extended duration but also excessive project costs. It is needed by both owner and contractors to have good understanding to delay factors in construction project. The research aim is assesing delay factors in construction project from owner and contractors point of view. Questionnaire was used in this research and data were analyzed through Kendall’s W test using SPSS programme. This research has analyzed 15 delay factors in construction projecy i.e land acquisition delay, location, social, contract change order (CCO), rework, quality of subcontractor, delay in permits, poor planning, unstable material price, law and regulation, owner required, inflation, payment delay, cash flow and bad weather. The research finding land acquisition delay as the top of delay factors in construction project in Indonesia.

While the need for water supply infrastructure development keeps increasing, many local governments of Indonesia are facing problems related to limited funding. This condition opens up an opportunity for private sector to invest in water supply infrastructure projects through Public Private Partnership (PPP) scheme. As this scheme is relatively new for many local governments in Indonesia, its complexity and typically long duration of the concession period may raise concerns of potential risks throughout the project life cycle. It is, therefore, very important for public sector as owner of the project to understand and to be able to manage risks properly throughout the concession period. The aim of this research is to evaluate risk management of West Semarang Water Supply PPP Project as perceived by public sector. The objectives are to identify, to analyze, and to allocate risks to the right parties. Qualitative and quantitative approaches have been used for the research method. Data were collected through focus group discussion involving 16 relevant officials of local government of Semarang, including its Regional Water Supply Company (PDAM). This research has identified a total of 66 risks as perceived by the public sector, which are then classified into 11 categories, e.g. political, operation, revenue, etc. The proportions of the level of risks are relatively balanced, as follows; low (37.88%), moderate (28.79%) and high (33.33%). In terms of risk allocation, 46.97% of risks are allocated to the public sector, while 37.88% and 15.15% of the risks are allocated to the private sector and shared by both parties, respectively. The results of this research are valuable for the local government of Semarang and can be used as a guidance in managing risks of the PPP project throughout the concession period.

In 2016, Indonesia is concerning about the acceleration of public infrastructure projects through the existence of government strategy projects that spread across several project sectors, including in highway projects. Totally, there is a 44 highway strategic project in Indonesia and several of them are currently in Central Java. Unfortunately, as a national strategic project, even though all of these projects are prioritized in their construction process, the implementation of the national strategic projects are faced up problems especially related to high pressure from the government that has an impact to project cost even causing cost overrun including in highway strategic project. The research aim is to analyze factors causing cost overrun in highway strategic project from owner and contractor perspectives. This study is limited to a case study in Pemalang-Batang Highway Strategic Project. The analysis of the study is using Risk Breakdown Structure to identify risk factors causing cost overrun. From a total of 14 risks identify, both parties agreed to design change as the most risk factor in causing cost overrun in highway strategic project in Indonesia.

Risk is part of infrastructure projects, and EPC projects are no exception. Risk is a consequence of uncertainty conditions. In construction projects, the risk cannot be predicted because there are a lot of uncertainties in predicting problems [1]. The risks in different types of contract projects would also be different, because of the different characteristics of each contract. In this study, the risk of construction projects was reviewed based on the project life cycle of the E.P.C (Engineering Procurement Contract) contract. The aim of this study is to analyze the risk from the perception of the owner of the project with the Engineering, Procurement, and Construction contract type. Primary data collected were in the form of identification and assessment of the impact and risk probability obtained by interviews and questionnaires. Data analysis was done with the Risk Breakdown Structure method to determine the risk ranking. The risk analysis of the Engineering Procurement Construction project from the owner’s perception showed that the majority risk was risk in the low category (46%), then moderate risk (27%), and high risk (27%).

Construction has been significantly influenced by COVID-19. In some countries, construction projects are discontinued, and even in some countries where construction work is still permitted, high safety standards are required. Construction site safety is essential during the COVID-19 pandemic. The contractor is responsible for creating a safe workplace at the project site. Therefore, this paper presents project risk identification and mitigation during the covid-19 pandemic based on contractor’s perspective. This research identified the risk factors related to the COVID-19 pandemic that consist of 5 categories: man, materials, machines, methods, and environment. Between these risk factors, worker shortage, site accessibility, and lack of construction materials, caused by the strict large-scale social restrictions (PSBB) policy are the biggest challenges faced by the contractor. The findings of this research develop the project risk categories and mitigation strategies from the contractor’s perspective. It suggests that future construction in addition to planning the design, operate, maintenance, supply chain, and project management must also consider the occurrence of a pandemic.

Along with the implementation of infrastructure development, the need for building materials in Indonesia will continue to increase. Building materials themselves are generally sourced from Indonesia's natural resources (SDA). But lately people have an interest in the use of environmentally friendly products. Seeing these two things gave rise to new thoughts to replace some of the aggregates in paving blocks using microfiber waste where microfiber waste is synthesis waste that is difficult to recycle. Experimental studies were chosen as a method in this study which was carried out directly and objectively. This study used a percentage of 0%; 0,25%; 0,5%; 0.75%, and 1% which results in a compressive strength value of 34.03 Mpa; 25.72 Mpa; 34.12 Mpa; 29.29 Mpa; and 23.66 Mpa. The optimum value of the compressive strength of the paving block was obtained at a percentage of 0.5% which is 34.11 Mpa. As well as producing a water absorption value of 4.42%, each of which produces a value of 4.42%; 4,34%: 5,09%; 4.78% which is included in the B quality category while the 1% percentage of 6.7% is included in the C quality category.