The Strength of pervious concrete is as important as its permeability characteristics. Studies indicate that pervious concrete has lower compressive strength capabilities than conventional concrete and will only support light traffic loadings. This thesis investigated prior studies on the compressive strength of pervious concrete as it relates to water-cement ratio, aggregatecement ratio, aggregate size, quantity of admixture and compaction and compares those results with results obtained in laboratory experiments conducted on samples of pervious concrete cube casted for this purpose. Since voids are supposed to reduce the strength of concrete 1% for every 5% voids the goal is to find a balance between water, aggregate, and cement in order to increase strength and permeability, two characteristics which tend to counteract one another. The end result of this research will be a recommendation as to the water-cement ratio, the aggregatecement ratio, aggregate size, quantity of admixture and compaction necessary to maximize compressive strength without having detrimental effects on the permeability of the pervious concrete system. This research confirms that pervious concrete does in fact provide a lower compressive strength than that of conventional concrete. Researches indicate that the minimum compressive strengths of acceptable mixtures reached in to 2.8 Mpa-and maximum compressive strength reached to 28 Mpa. Extremely high permeability rates were achieved in most all mixtures regardless of the compressive strength.
Risk can be described as the absence of information when a decision is to be made at any time throughout a process. The construction industry is often considered as complex and defragmented due to working in a project based format; with a unique product and a process where there are times when decisions need to be made with insufficient information. Therefore, proper risk management processes can be vital to minimizing risks, maximizing opportunities and securing a successful project process This master thesis has been conducted at a large Swedish construction company that houses both a constructing unit and a residential development unit. Consequently, the focus of this thesis has been on analysing the risk management process when a residential project is both developed and constructed by the same company. The purpose of this master thesis is to describe and analyse risk management in a project based organization within the construction industry. The thesis aims to provide a better understanding of how risk management is used in practice but also what underlying factors that can affect risk management processes. The study will include both the perspective of the developer and the constructor; as well as their separate and joint processes facilitating risk management. In regards to the purpose of this thesis, a general risk management model has been used to provide a framework for analysis. This model consists of four steps: risk identification, risk assessment, risk mitigation and risk monitoring.
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