Bachelor

• Effects of increased fresh concrete temperatures on fresh and hardened concrete properties
• Vibrated concrete - mix stability
• Self-compacting concrete - mix stability

Master

• Influence of the decisive concrete engineering parameters on the stickiness of concretes
• Alternative curing of tunnel liners under practical climatic conditions
• Investigation of the shrinkage behavior and flexural strength of subsequently applied plastic fiber-modified concrete screed
• Microscopic investigations on the influence of steel fibers on microcracking behavior in high-strength concrete
• Alternative curing of tunnel liners under practical climatic conditions
• Evaluation of rheological measurement data for the assessment of the properties of two-component mortars for annular gap grouting in mechanized tunneling (Project work - Chair of Tunneling, Pipeline Construction and Construction Operations)

Bachelor

• Experimental studies on the interaction of swelling clay rock and deformable tunnel lining
• Use of carbon nanotubes in cementitious binder systems
• Durability of concrete - damage mechanisms and service life prediction of structural elements
• Mixing stability of vibrated concrete
• Mixing stability of self-compacting concrete
• Effects of elevated fresh concrete temperatures on fresh and hardened concrete properties

Master

• Fatigue behavior of high-strength cement paste under cyclic loading in the compressive swell range
• Fatigue behavior of high-strength cement paste with and without carbon short fibers under cyclic loading in the tensile swell range
• Fatigue behavior of high-strength concrete with and without steel short fibers under cyclic loading in the tensile swell range
• Systematic investigations on the stressability of hot and cold workable jointing compounds in concrete pavements
• Assessment of the sedimentation stability of fresh concrete - influence of the state of compaction
• Strategies to avoid color irregularities on fair-faced concrete surfaces
• Cement-reduced concretes - development of a concrete formulation with a greatly reduced cement content to below the standard limits with the aim of reducing CO2 in concrete
• Boundary conditions for the production of mortars with plastic consistencies using resource-efficient cements
• Assessment of the sedimentation stability of fresh concrete - Development of a coarse-grain screen
• Development and experimental investigation of optimized segmental systems (Cooperation: Chair of Solid Construction, Ruhr University Bochum)
• Durability of concrete according to the performance principle - influence of w/c-value variations on the parameters chloride penetration and carbonation resistance (Cooperation: VDZ)

Bachelor

• State of the art of compressible cementitious systems and their initial components
• Effects of elevated fresh concrete temperatures on fresh and hardened concrete properties
• Rehabilitation of concrete traffic surfaces in the USA and Europe - state of the art and new developments
• Fatigue behavior of (ultra-)high-strength concretes - effects of test-related influencing factors

Master

• Metrological and computational methods for determining the heat of hydration of cement pastes, mortars and concretes
• Fatigue behavior of high-strength mortars under cyclic loading in the pressure threshold range
• Effect of curing and concrete surface properties on the penetration behavior of liquid media

Bachelor

• Influence of steel fibers on the flexural strength and fatigue behavior of high-strength concretes
• Process for the preparation of finely divided crushed sand for use in concrete construction
• Jointless repair of concrete pavements with carbon concrete - Cyclic loading in laboratory tests
• Bridging of cracks and joints using textile-reinforced repair layers
• Influence of finely divided crushed sand on the rheological properties of mortars
• Robustness of fresh concrete - effects of unplanned variations on concrete quality

Master

• Development of a concept for emplacement tests in the Emscher sewer and creation of a monitoring system
• Fatigue behavior of high-strength concrete under cyclic loading in the tensile swell range
• Influence of compaction on the fresh and hardened concrete properties of very soft to flowable concretes
• Investigation of the compression behavior of lightweight concrete
• Assessment of the sedimentation stability of fresh concrete - Development of a coarse-grained scanner
• Use of steel fiber shotcrete in tunnel construction: national and international regulations for testing and dimensioning
• Influence of the properties of ASR test cements on the results of the rapid test procedure

Bachelor

• Degradation processes in high-strength concretes as a result of floating stresses
• Effect of different boundary conditions during acid attack on concrete
• Influence of microstructure on the transport behavior of liquid media in concrete
• Composite behavior of macro- and microfibers in a cementitious matrix
• Jointless repair of concrete pavements with carbon concrete - reflection cracking, shrinkage deformation and stress development
• Jointless repair of concrete pavements with carbon concrete - Bond behavior of old and new concrete
• Robustness of fresh concrete - Effects of unplanned variations on concrete quality

Master

• Assessment of the sedimentation stability of fresh concrete
• Jointless repair of concrete pavements with carbon concrete - Transfer of in-situ boundary conditions to test specimens
• Influence of steel fibers on the fatigue behavior of high-strength concrete
• Load-bearing and composite behavior of carbon reinforced concrete specimens in double-sided textile pull-out tests
• Concrete elements with micro-reinforcement under partial area loading
• Development of a binder system for the production of a robust ultra-high performance concrete

Bachelor

• Bond properties of textile reinforcements in concrete
• Influence of aggregate size on the degree of hydration of cement mortars
• Influence of granulometry and w/c ratio on the properties of cement mortars
• Use of fine recycled aggregate as main cement constituent
• Durability of high-strength and ultra-high-strength concretes
• Influence of the chemical composition and granulometry of blastfurnace slags on the strength development of concretes containing blastfurnace slags
• Investigation of existing methods for the determination of pore size and pore size distribution of non-cohesive unconsolidated aggregates
• Workability and stability of fresh concrete - Test methods for the evaluation of special fresh concrete properties
• Technical design of annular gap grouting of two-component mortars taking into account material-specific and constructional factors

Master

• Joints in concrete pavements - stressing of hot and cold applied jointing compounds
• Influence of the fines content and the addition of admixtures on the pumpability and sedimentation stability of long-time retarded sprayed concretes
• Development of a test setup for the simulation of the grouting process of two-component mortars under practical boundary conditions
• Influence of different test boundary conditions on the evaluation of acid resistance based on sulfuric acid attack on slag-containing mortar
• Effect of rolling over traffic on the pressure development in the concrete structure
• Influence of fresh material temperature on the properties of cementitious grouted concrete and grout

Bachelor

• Technical execution of annular gap grouting of two-component mortars taking into account material-specific and constructional factors
• Robust concretes - influences of modern superplasticizers as well as fines properties
• Crack width limitation of textile-reinforced concrete components
• Acid resistance of concrete when using cements containing blastfurnace slag and blastfurnace slag as additives
• Strength development of two-component mortars by alkaline activation of blastfurnace slags
• Steel corrosion and repair concepts using the example of the Henrichshütte steel mill in Hattingen, Germany
• Strength development of two-component mortars by addition of additives with physical effects - Superabsorbent polymers
• Service life prediction of concrete components - Durability and remaining service life

Master

• Stiffness development of two-component mortar for annular gap grouting in mechanized shield driving
• Influences of concrete and production technology parameters on the load-bearing and bond behavior of hybrid concrete elements
• Capillary pressures in hardened concrete due to external influences
• Finishing of industrial floors - influence of the moisture condition and the time of smoothing on the finish of the concrete surface
• Lining of drinking water reservoirs - influence of finishing and curing of a concrete replacement on resistance to water penetration
• Joints in concrete pavements - stressing of hot workable joint compounds
• Investigations into the load-bearing and bond behavior of hybrid concrete elements under shear stresses
• Alkali-silica reaction in concrete - damage development as a function of aggregate grain size
• Strength development of a two-component mortar for annular gap grouting in mechanized shield driving as a function of the composition of the activating component B

Bachelor

• Behavior of fresh concrete during concreting of drilled piles in non-cohesive soil
• Influence of modified grading curves on the fresh and hardened concrete properties of special concretes
• Joints in concrete pavements - Parameters influencing the joint movement of concrete pavements
• High-strength and ultra-high-strength concretes - Granulometry and composition of composite binders
• Comparison of different methods for determining the surface roughness of concrete and methods for surface treatment of concrete
• Alkali-silica reaction in concrete - Differentiated consideration of the influence of the total alkali content without and with external alkali supply
• Strength development of a two-component mortar for annular gap grouting under variation of the amount and time of addition of component B (accelerator)
• Influence of different cement-bentonite combinations on the workability of component A of two-component mortars for annular gap grouting
• Degradation processes in concrete components as a result of cyclic load effects
• Two-component mortar for annular gap grouting in mechanized shield tunneling
• Influence of different bentonites on the workability of the binder-containing component of two-component mortars for annular gap grouting
• Influence of different concrete retarders on the workability time of the binder-containing component of two-component mortars for annular gap grouting
• Joints in concrete pavements - stressing of hot-applied jointing compounds
• Joints in concrete pavements - Parameters influencing the joint movement of concrete pavement slabs

Master

• Influence of pre-storage conditions on the freeze-thaw resistance of concretes with slag-containing cements
• Ultrasonic transit times in concrete components as a function of degradation and moisture state
• Practical evaluation methods for the rheological properties of fresh concrete, in particular with regard to appropriate surface treatment
• Drainage and infiltration behavior of annular gap mortars as a function of the permeability of the soil in saturated condition
• Experimental development of measurement techniques for the detection of capillary pressures in hardened concrete as a result of swaging

Bachelor

• Influence of the packing density of grading curves on the properties of a fresh concrete
• Capillary penetration of liquid and salts in road concrete
• Sensitivity of fresh and hardened mortar properties of annular gap mortars to variations in water content
• Investigations into the production of bored piles from erosion-resistant drainage concrete
• Influence of the fineness of fly ash and the mineralogical composition of bentonite on the drainage behavior of annular gap mortars
• Factors influencing the flexural strength of concrete beams
• Protective measures for structures in concrete-aggressive groundwaters
• Development of a test method for assessing skin formation on fresh concrete
• Investigations into the load-bearing capacity of steel fiber concrete with fiber cocktails under extremely eccentric partial area loading

Master

• Investigations into the influence of additives on the workability of grouting mortars
• Application of a SWB concrete in the sliding and climbing/sliding formwork method in the Emscher sewer construction section 30 project
• Practical evaluation methods for rheological properties of fresh concrete
• Workability of drain concrete for use in bored piles
• Determination of the necessary glue content of an open-pored concrete as a function of the grading curve for the creation of a near-surface void system
• Investigation of the influence of specimen dimensions on the load-bearing behavior of concrete under centric partial area loading
• Determination of the bond behavior between old and new concretes under consideration of joint pretreatment
• Influence of limestone fineness on fresh and hardened mortar properties
• Rearrangement of fines in the mortar as a result of its dewatering in the annular gap
• Load-bearing and fracture behavior of steel fiber reinforced concrete under shear loads
• Investigation of the structural and mechanical properties of an open-pored road concrete COPS) with the addition of plastic dispersion

Bachelor

• Reinforced concrete traffic surfaces - experiences abroad and current developments in Germany
• Development of a laser scanning method to determine the void content and surface texture of porous road concrete (COPS)
• Influence of pre-storage conditions on the freeze-thaw resistance of concretes with slag-containing cements
• Investigation of the simultaneous use of polycarboxylate ether and naphthalene sulfonate in self-compacting concrete
• Determination of slump flow of self-compacting (fine) concrete with different test methods
• Investigation of the load-bearing behavior of steel fiber concrete made of fiber cocktails with two fiber types under centric partial area loads
• Causes of secondary ettringite formation - chemical processes and their effects on the concrete structure
• Assessment of an alkali-silica reaction: comparison of national and international test methods
• Investigation of durability properties of road concretes using TiO2 nanoparticles
• Influence of fiber orientation in concrete on the bearing and fracture behavior of steel fiber reinforced concrete under centric partial area loads
• Investigation of the bearing capacity of concrete under eccentric partial area loading

Master

• Influence of temperature and superplasticizers on the rheological properties of cement suspensions
• Load-bearing behavior of steel fiber concrete made from fiber cocktails with three fiber types under partial area loads
• Development of shear strength using a frame shear tester on dehydrated mortar formulations for annular gap grouting

Diplom

• Uniformity of concretes
• Effect of superabsorbents on the properties of fresh and hardened mortars including transfer of results to self-compacting concrete in road construction

Bachelor

• Investigation of the void content of an open-pored road concrete by varying the glue content
• Influence of paving thickness on strength development or durability of cementitious grouted concrete
• Influence of steel fiber content on the bearing capacity of concrete under centric partial area loading at different loading surfaces
• Evaluation of the drainage behavior of cementitious and cementless RSM when admixtures are used
• Comparison of different repair systems for the production of an expedient exposed aggregate concrete structure for pavements
• Optimization of mortar composition of annular gap mortars with regard to workability and strength development - Part I
• Development of an early high-strength repair concrete for road construction using hardening accelerators
• Acid-resistant concrete for wastewater treatment plants - Influences on durability due to microbially induced sulfuric acid corrosion
• Non-destructive determination of structural damage in concrete using ultrasonic measurements
• Determination of the shear strength of dewatered annular gap mortars

Diplom

• Use of plastic admixtures in concrete for wastewater treatment plants
• Strength development of annular gap mortars as a result of dewatering
• Influence of steel fiber types on the load-bearing behavior of concrete under centric partial area loading

Bachelor

• Fire protection of tunnel liners - concrete technology measures and fire protection linings
• Investigations on mechanical properties of concrete when using fiber cocktails
• Influences of different fiber types and fiber contents on the workability of steel fiber concrete
• Development of early high-strength repair concretes for traffic areas in exposed aggregate construction using rapid-hardening concrete

Diplom

• Fiber cocktail in concrete - influence on concrete properties and load-bearing behavior
• Comparison of air content and air void characteristics in fresh and hardened concrete using different measurement methods
• Minimum air void content for concrete road pavements in exposed aggregate design
• Zoned construction method for vertical massive components in hydraulic engineering using precast elements
• Determination of the relevant fresh and hardened mortar properties of annular gap mortars as a function of the granulometry of the fines
• Causes and effects of structural damage on the long-term behavior of concrete pavements

Bachelor

• Application of open-pored concrete pavements for the reduction of rolling noise in concrete traffic surfaces
•  Influence of metrological and material-specific parameters in rheological investigations

Diplom

• Drainage behavior of mortars for annular gap grouting
• Zoned construction method for vertical massive components in hydraulic engineering using the "fresh-in-fresh" construction method
• Solution processes during acid-sulfate attack on concrete

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Diplom

• Galvanized steel fibers in concrete - influence on concrete structure and bond behavior due to hydrogen formation

Diplom

• Photocatalytic reaction of titanium dioxide in concrete
• Influence of different aggregates on the fatigue behavior of concrete due to cyclic compressive loading
• Evaluation of the effectiveness of a chemical surface hardening on the surface quality of industrial floors
• Verification of the practicability of a measuring method for determining fiber content and fiber orientation in fresh and hardened concrete
• Influence of different concrete admixtures on the thixotropy and green strength of fresh concrete
• Influence of different concrete admixtures and materials on the thixotropy of cement paste and mortar
• Microscopic investigation of the crack condition of bridge concrete after 50 years of use

Diplom

• Fine mortar for injection concretes - design, properties and testing
• Catalog of measures for the maintenance and rehabilitation of concrete and masonry sewage manholes
• Test methods for assessing the workability of grouting mortar and grouting concrete

Diplom

• Fine mortar for injection concretes - design, properties and testing
• Catalog of measures for the maintenance and rehabilitation of concrete and masonry sewage manholes
• Test methods for assessing the workability of grouting mortar and grouting concrete

Diplom

• Possibilities for the repair of exposed aggregate concrete facades
• Investigations on the long-term behavior of concrete repair systems under free weathering conditions
• Effects of pyrite oxidation on concrete components in the substrate

Diplom

• Laser-based investigations of shrinkage and swelling deformations of cements commonly used in the construction industry

Diplom

• Relationship between mortar and lightweight concrete strength with combined grain and matrix porosity

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Diplom

• Investigations into the required stripping strength of concrete components
• Electromagnetic treatment of raw materials for concrete production
• Pre-expanded air as an additional concrete component for the production of structural lightweight concrete and high-strength lightweight concrete
• Quantification of frost damage of concrete based on selected mechanical parameters
• Robust concretes - sensitivity to changes in composition, processing and curing
• Freezing behavior and structural change of high-strength cement blocks due to temperature and moisture change
• Mechanical properties of high-strength cement blocks and high-strength fine sand mortar as a result of moisture change

Diplom

• Influence of fly ash content and water-binder value on the strength development of "robust concretes
• Application possibilities and limits of pre-expanded air voids in concrete construction
• Correlation between temperature behavior and early strength in high-performance concretes containing fly ash and microsilica
• Mortar configuration and hardened concrete properties of mortared concrete chippings compared to conventional chippings concretes
• Pre-expanded air voids in concrete construction as a replacement for conventional LP agents
• Effectiveness and application possibilities of new types of superplasticizers for high-performance concretes
• Development of a test method for the calibration of anode conductors for the moisture determination of high-performance concretes