Abstract Today there is an opportunity to reinforce concrete with steel fiber reinforcement. In some cases, completely replace the conventional reinforcement. Replacing conventional mesh reinforcement with steel fiber reinforcement in slabs on ground has shown economic benefits, less crack width and less reinforcement amount. Today there are no Swedish standard for designing steel fiber reinforced concrete, what is there is different international recommendations. In this work, design methods for steel fiber concrete are used according to RILEM and Bekaer Swedish AB's software DRAPRO. For other design methods Eurokod 2 is followed. In this work, the design of slabs on ground that are not exposed by large tension strength been designed. Design of crack-reinforcement and restrictions of crack width have been conducted in three different slabs on ground. The calculations have been performed using only conventional reinforcement and only steel fiber reinforcement, and the results are then compared. The results of the theoretical analysis are summarized in tables that compare the amount of reinforcement, crack width and economic cost. This work showed that the slabs on the ground reinforced with steel fibers provide less crack width with a minor amount of reinforcement. The use of steel fiber concrete was also shown to reduce the reinforcement costs by about 70-75%. The absence of a Swedish standard may have caused some uncertainty among Swedish structural engineers using steel fiber reinforced concrete and there is a limited understanding of the material advantages. This may be a reason for the use of steel fiber concrete is relatively small in Sweden. Another reason why the use of steel fiber concrete is not expanding may be that the current mesh is so easy to reinforce with and is therefore used of traditional reasons. Hopefully, this work will make structural engineers to review the possibility of using steel fiber reinforcement instead of conventional mesh reinforcement in slabs on grade. Partly because of its economic advantage but also its ability to minimize crack width with a reminiscent reinforcement amount, which in turn can be beneficial from an environmental perspective.

Many of today’s waterworks were built in the 1950s to 1970s and today they showsigns of damage and great wear on the concrete structures of the pools. There arelarge needs of renovation of the existing pools, but also an increasing need for newfacilities since cities are growing. This thesis aims to investigate the occurrence andcause of damages that can occur on concrete pools in waterworks and the demandson the tightness and durability of the structure. The target of the thesis is tofind out which factors are behind the requirements and how these can be taken inconsideration when designing new waterworks. The thesis has resulted in a guideline aimed at structural engineers, who lackexperience in designing waterproof structures, and intends to complement thedevelopment of design requirements. The use of the guideline is illustrated at the endthrough a simplified design example. The thesis has also shown that there are no general requirements for tightness anddurability for pool structures in waterworks, nevertheless there are many factors thatneeds to be considered, hence the requirements are project-specific.

This thesis studies the differences in the required amount of reinforcement in concrete structures since the introduction of the Eurocodes as the new standard for construction design in Sweden.  The introduction of the European construction standards, the Eurocodes, as the new norm for design of structural elements in buildings on the Swedish market in 2011, put an end to the old Swedish standards set by BKR, boverkets konstruktionsregler.  This thesis is based on comparison studies to analyze the amount of required reinforcement for crack width control in concrete cross-sections exposed to shrinkage strain according to Eurocode 2 and BBK 04. The study also deals with the influence of required reinforcement in the calculation of crack widths due to tensile stresses.  The results in this thesis is built on comparative studies between the new Eurocode standard and the old BBK to examine and highlight the key differences when performing these types of calculations. The prerequisites for the calculations have been varied to obtain a clearer view of the outcome.  The results show a general increase in the required amount of reinforcement when calculating according to Eurocode compared to BBK. It also shows that a higher total amount of reinforcement in combination with smaller dimensions reduces crack width.

This thesis deals with minimum reinforcement and crack width in concrete caused by compressiveforces. The report also describes the reinforcement's anchorage length and joint length. Concreteis a common building material for houses. To prevent cracks in the concrete that occur due totensile stresses, it is supplemented with crack reinforcement, which also distributes cracks intosmall fine cracks and maintains its function.Within the construction industry, there are rules and standards that are used to ensure the qualityand safety of buildings. The construction industry in Sweden has previously dimensioned basedon BBK and today according to Eurocode 2. The motive is to investigate which standardprovides the least amount of reinforcement. Another motive for the thesis work is toinvestigate whether it is possible to reduce the amount of reinforcement to reduce the climateimpact.The results from the survey show that the perception that BBK provides less minimumreinforcement holds true for thicker slabs. However, the calculations that the crack width iscalculated according to BBK are larger than Eurocode 2. When it comes to limiting the crackwidth, the results have shown that smaller reinforcement reduces crack width. Consequences ofthis are that there will be more reinforcement bars but less reinforcement amount, which meansthat less reinforcement needs to be manufactured. The result also shows that anchorage and jointlength can be reduced by up to 50% of the standard value used, which is one of the areas inwhich reinforcement consumption can be reduced.

Purpose: Concrete is a widely used construction material for mainly buildingfoundations. In Sweden Eurocode is used to dimension the minimum reinforcement that is supposed to limit the cracking of the concrete after casting, but cracking is nevertheless a common problem. The aim of this paper is to investigate how structural engineers choose the reinforcement in slabs on ground and how the construction is affected by the choice of reinforcement. Method: In the study, a literature study is made with articles within minimum reinforcement and cracking problems. A document analysis is made of how the Eurocode should be interpreted and used to calculate the minimum reinforcement amounts and crack widths. There are structured interviews with five design companies to investigate how minimum reinforcement is chosen for three different types of slabon ground. Findings: The results of the study show that the final construction might be both physically and economically affected in a negative way due to the fact that the wanted minimum reinforcement levels and crack widths are not always reached. Implications: The findings implicate that the choice of minimum reinforcement is done in different ways among engineers, and a significant difference in the levels could be seen. The recommendations are that the formula for crack width limitation should be used first, lower rebar dimensions should be used and that the communication between building construction engineer and builder should beimproved. Limitations: The study was limited to five interviews with building construction engineers, only three different slab examples were given to the interviewees for calculation of crack limitation reinforcement. Hence the results are not generally useful for all types of slab on ground. Keywords: Crack width, eurocode, eurokod, minimum reinforcement, slab on ground