56 Bauwesen
Refine
Document Type
- Doctoral Thesis (46)
- Article (31)
- Master's Thesis (17)
- Conference Proceeding (11)
- Preprint (9)
- Bachelor Thesis (6)
- Report (4)
- Book (2)
- Periodical (2)
- Study Thesis (1)
Institute
- Institut für Strukturmechanik (ISM) (28)
- Junior-Professur Computational Architecture (16)
- Professur Baubetrieb und Bauverfahren (12)
- Professur Informatik in der Architektur (12)
- Professur Modellierung und Simulation - Konstruktion (8)
- F. A. Finger-Institut für Baustoffkunde (FIB) (6)
- Professur Stahl- und Hybridbau (4)
- Institut für Konstruktiven Ingenieurbau (IKI) (3)
- Professur Bauphysik (3)
- Professur Betriebswirtschaftslehre im Bauwesen (3)
Keywords
- Architektur (8)
- OA-Publikationsfonds2022 (7)
- Aerodynamik (5)
- BIM (5)
- Bridge (5)
- OA-Publikationsfonds2020 (5)
- Beton (4)
- CAD (4)
- Erdbeben (4)
- Ingenieurwissenschaften (4)
- Maschinelles Lernen (4)
- Simulation (4)
- Buffeting (3)
- Computational Urban Design (3)
- Concrete (3)
- Denkmalpflege (3)
- Finite-Elemente-Methode (3)
- Gips (3)
- Projektmanagement (3)
- damaged buildings (3)
- machine learning (3)
- simulation (3)
- Bauablauf (2)
- Bauantrag (2)
- Baugenehmigung (2)
- Bauphysik (2)
- Bender elements (2)
- Brückenkappe (2)
- Building Information Modeling (2)
- Building application (2)
- Cement (2)
- Computational Design (2)
- Decision-making (2)
- Energieeffizienz (2)
- Entscheidungsmodell (2)
- Erdbebensicherheit (2)
- Finite Elemente Methode (2)
- Flutter (2)
- Frost (2)
- Fuzzy-Logik (2)
- IFC (2)
- Lebenszyklus (2)
- Lehm (2)
- Lehmbau (2)
- Machine learning (2)
- Modellbildung (2)
- Nanoverbundstruktur (2)
- Optimierung (2)
- Optimization (2)
- Polymere (2)
- Process management (2)
- Project management (2)
- Prozessmanagement (2)
- Quantitative Sozialforschung (2)
- Rissausbreitung (2)
- Shear modulus (2)
- Soil (2)
- Tricalcium silicate (2)
- Umweltbilanz (2)
- Uncertainty (2)
- Vortex particle method (2)
- Vulnerability assessment (2)
- Zement (2)
- earthquake (2)
- earthquake safety assessment (2)
- multiscale (2)
- nanocomposite (2)
- rapid visual screening (2)
- soft computing techniques (2)
- stochastic (2)
- vulnerability assessment (2)
- Ökobilanz (2)
- 0947 (1)
- 0948 (1)
- 0949 (1)
- 2D/3D Adaptive Mesh Refinement (1)
- Abbruch (1)
- Abfall (1)
- Abwasser (1)
- Acceleration (1)
- Adalbert (1)
- Adalbert / Der Nachsommer (1)
- Aerodynamic admittance (1)
- Aerodynamic derivatives (1)
- Aerodynamic nonlinearity (1)
- Aerodynamics (1)
- Aeroelasticity (1)
- Aeroelastizität (1)
- Aktionsraumforschung (1)
- Algorithmus (1)
- Alkali-Kieselsäure-Reaktion (1)
- Alker (1)
- Alterung (1)
- Analytische Lösung (1)
- Arbeitsablauf (1)
- Arbeitsplanung (1)
- Architekturausbildung (1)
- Architekturentwicklung (1)
- Architekturgeschichte Shanghai (1)
- Architekturtheorie (1)
- Artificial coral reefs (1)
- Artificial neural network (1)
- Ausbau (1)
- Autogenous (1)
- Autokorrelationslänge (1)
- Automatisierung (1)
- Autonomous (1)
- BIM <CAD> (1)
- Bau-Ist (1)
- Bauchemie (1)
- Bauhaus (1)
- Bauklimatik (1)
- Baulogistik (1)
- Bauprozess (1)
- Bausoll (1)
- Bausteinbibliothek (1)
- Baustoff (1)
- Bautechnik (1)
- Bauwerkszuordnungskatalog (BWZK) (1)
- Bauwesen (1)
- Bayesian Inference, Uncertainty Quantification (1)
- Bayesian parameter update (1)
- Bayes’schen Inferenz (1)
- Bemessung (1)
- Bending Stiffness of cable elements (1)
- Benutzung (1)
- Berechnung (1)
- Bergbau (1)
- Bergeteich (1)
- Berlin / Ausstellung Exil (1)
- Beschädigung (1)
- Betongelenk (1)
- Betonverflüssiger (1)
- Biegesteifigkeit (1)
- Biegetheorie (1)
- Bogenstaumauer (1)
- Bonding Methods (1)
- Brandschutz (1)
- Bridge aerodynamics (1)
- Bridges (1)
- Brücke (1)
- Brückenbau (1)
- Budgetierung (1)
- Building Permit (1)
- Building performance (1)
- Building permit (1)
- Building safety assessment (1)
- Bühnenbild (1)
- CAAD (1)
- Calciumsulfat (1)
- Calciumsulfatfließestrich (1)
- Cancel Culture (1)
- Category Theory (1)
- Cellular automata (1)
- Censorship (1)
- Climatic conditions (1)
- Cognitive design computing (1)
- Complexation (1)
- Computational Bridge Aerodynamics (1)
- Computational Fluid Dynamics (1)
- Computational fluid dynamics (1)
- Computational modelling (1)
- Computational urban design (1)
- Computer (1)
- Concrete catenary pole (1)
- Construction (1)
- Corrosion (1)
- Corruption (1)
- Coupled-Eulerian–Lagrangian (1)
- Crack (1)
- Cracks 3D Modelling (1)
- Cracks Segmentation (1)
- Cross-Section Distortion (1)
- Cross-Section Warping (1)
- Cryogenic Suction (1)
- Curved thin-walled circular pipes (1)
- Damage (1)
- Damage Identification (1)
- Damage Information Modelling (1)
- Damage accumulation (1)
- Damage mechanism (1)
- Damm (1)
- Data Mining (1)
- Data-driven (1)
- Deal ii C++ code (1)
- Deck cross-sections (1)
- Defekt (1)
- Deformationsverhalten (1)
- Demolition (1)
- Denkmalschutz (1)
- Design synthesis (1)
- Digital Games Based Learning (1)
- Dresden (1)
- Druckglied (1)
- Dynamic Analysis (1)
- Dynamische Analyse (1)
- EDA <Optimierung> (1)
- Earthquake (1)
- Ecology in design (1)
- Emigration to China (1)
- Emotion (1)
- Energieverbrauch (1)
- Entropie (1)
- Entscheidungsfindung (1)
- Entwicklungsländer (1)
- Entwurf , Psychologie , Orientierung , Methode , Architektur (1)
- Entwurfsmethodik (1)
- Entwurfsprojekt (1)
- Entwurfssystem, computerbasiertes Planen, evolutionäre Optimierung, Grundrisse, generative Methoden (1)
- Ergebnisorientierte Steuerung (1)
- Ergänzungsbaustoffe (1)
- Erinnerungskultur (1)
- Ertüchtigung (1)
- Ethiopia (1)
- Euthanasie <Nationalsozialismus> (1)
- Evolutionary algorithm (1)
- Evolutionäre Algorithmen (1)
- Evolutionärer Algorithmus (1)
- Experiment (1)
- Explicit finite element method (1)
- Extended Finite-Elemente-Methode (1)
- Extreme value distribution (1)
- Facility Management (1)
- Faseroptischer Sensor (1)
- Fatigue life (1)
- Feldversuch (1)
- Feuer (1)
- Finite Element (1)
- Finite Element Method (1)
- First Order Reliability Method (1)
- Fließestrich (1)
- Fließmittel (1)
- Fliplife (1)
- Flucht und Emigration Europäischer Künstler 1933-1945 <1998> (1)
- Fluid memory (1)
- Flächen zweiter Ordnung (1)
- Forschungseinrichtung (1)
- Fracture mechanics (1)
- Frost-Tausalz-Angriff (1)
- Frost-Tausalz-Widerstand (1)
- Fuzzy Logic (1)
- Fuzzy logic (1)
- Fuzzylogik (1)
- GIS (1)
- GaBi Software (1)
- Gebäude (1)
- Gebäudebestand (1)
- Geheimdienst (1)
- Generalized Beam Theory (GBT) (1)
- Generalized Bean Theory (1)
- Geo-Statistical Analysis (1)
- Geografie (1)
- Geometrically nonlinear analysis (1)
- Geotechnik (1)
- Geschwindigkeit (1)
- Gestaltoptimierung (1)
- Gesundheitspolitik (1)
- Gesundheitsverwaltung im Nationalsozialismus (1)
- Glue Spall (1)
- Goal-oriented A Posteriori Error Estimation (1)
- Gravel-bed rivers (1)
- Greater Shanghai (1)
- Großbaustelle (1)
- Grundriss (1)
- Grundrissgenerierung (1)
- Grundstücksumlegung (1)
- Guyed antenna masts (1)
- Hans Poelzig . Architekturgeschichte der DDR (1)
- Hauptachsentransformation (1)
- Healing (1)
- Heritage Studies (1)
- High precision underwater monitoring (1)
- Hitze (1)
- Hochbau (1)
- Hochschulbau (1)
- Hochschule (1)
- Hochschulgebäude (1)
- Holzbau (1)
- Homogeneity (1)
- Homogenität (1)
- Hydraulic geometry (1)
- Hydro-mechanically coupled (1)
- Hydrologie (1)
- Hypoplasticity (1)
- Identifikation (1)
- Immobilienlebenszyklus (1)
- Immobilienportfolio (1)
- Industry Foundation Classes (IFC) (1)
- Informatik (1)
- Infrastruktur (1)
- Interaktion (1)
- Interaktion, Layouts, generierung (1)
- Interaktive numerische Simulation (1)
- Inverse Probleme (1)
- Inverse Problems (1)
- Investition (1)
- Isogeometrische Analyse (1)
- Isovist (1)
- Jahresarbeitsplanung (1)
- Jena (1)
- Judenvernichtung (1)
- K-d Trees (1)
- Kabel (1)
- Kalk (1)
- Kalkulation (1)
- Kapitalisierung (1)
- Kegelschnitt (1)
- Kirchoff--love theory (1)
- Klebstoff-Faser-Verbundwerkstoff; Alu-Carbon-Hybridelement; Glas-Kunststoff-Hybridelement; ANSYS; CFK; Klebverbindungen (1)
- Klebtechnik (1)
- Klima (1)
- Klimawandel (1)
- Klimaänderung (1)
- Koelnbrein (1)
- Kollektives Gedächtnis (1)
- Kopplungsmethode (1)
- Korallenriff (1)
- Korruption (1)
- Kosten- und Leistungsentwicklung (1)
- Kulturerbe (1)
- Kulturgeschichte (1)
- Kölnbrein (1)
- Künstliche Intelligenz (1)
- Künstliche Korallenriffe (1)
- Landesgebäude (1)
- Large deformation (1)
- Layout, generative Methode, evolutionäres Verfahren (1)
- Lebenszyklusorientiertes Management (1)
- Lernspiele (1)
- Life cycle assessment (1)
- Loading sequence (1)
- Local maximum entropy approximants (1)
- Long-span Bridges (1)
- Long-span bridges (1)
- Luci (1)
- Machine Learning (1)
- Machttheorie (1)
- Management (1)
- Marmara Region (1)
- Meeresökologie (1)
- Mesh Refinement (1)
- Messtechnik (1)
- Mikrokapsel (1)
- Mikrostruktur (1)
- Milieuforschung (1)
- Mongolia (1)
- Monte-Carlo-Simulation (1)
- Motion-induced forces (1)
- Multi-criteria (1)
- Multi-criteria decision making (1)
- Multikriterielle Optimierung (1)
- Museum (1)
- Musterjahresganglinien (1)
- NS-Architektur (1)
- NURBS (1)
- Nachbehandlung (1)
- Nachbehandlungsmittel (1)
- Nachkriegsmoderne (1)
- Nachsommer (1)
- Nationalsozialismus (1)
- Netscape Internet Foundation Classes (1)
- Neuronales Netz (1)
- Nichtwohngebäude (1)
- Non-Destructive Testing (1)
- Nonlinear Cable Analysis (1)
- Numerische Berechnung (1)
- Nutzerorientierte Bausanierung (1)
- OA-Publikationsfonds2018 (1)
- OA-Publikationsfonds2021 (1)
- Oberleitungsmasten (1)
- Operante Konditionierung (1)
- PU Enrichment method (1)
- Parameteridentif (1)
- Parameteridentifikation (1)
- Paramter Identification (1)
- Pareto Front (1)
- Pareto optimization (1)
- Partikel-Schwarm-Optimierung (1)
- Paulick (1)
- Pfahl (1)
- Pfahlgründung (1)
- Pfahlprobebelastung (1)
- Phase-field model (1)
- Pile Foundation (1)
- Pile Load Test (1)
- Planspiel (1)
- Plastische Deformation (1)
- Plastizität (1)
- Portfoliomanagement (1)
- Post Occupancy Evaluation (1)
- Potenzialanalyse (1)
- Power Ultrasound (1)
- Preservation (1)
- Priorisierung (1)
- Probabilistik (1)
- Prozessoptimierung (1)
- Public Private Partnership (1)
- Punktwolke (1)
- Quadrik (1)
- Quarz (1)
- RC Buildings (1)
- Rainflow counting algorithm (1)
- Rapid Visual Assessment (1)
- Rapid Visual Screening (1)
- Re-use (1)
- ReCiPe (1)
- Relative acceleration (1)
- Reliability (1)
- Reliability Analysis (1)
- Reliability-based design optimization (1)
- Reliabilität (1)
- Residentielle Mobilität (1)
- Reststoff (1)
- Retardation (1)
- Ric (1)
- Risiko (1)
- Risikoerfassung (1)
- Risikomanagement (1)
- Risk management (1)
- Riss (1)
- Rosenhaus (1)
- Rudolf Hamburger (1)
- SHM (1)
- Safety factor (1)
- Salt frost attack (1)
- Salt-Frost-Attack (1)
- Sanierung (1)
- Schaden (1)
- Schadenerkennung (1)
- Schadensakkumulation (1)
- Schadensanalyse (1)
- Schadensmechanismus (1)
- Schloss (1)
- Schwingung (1)
- Schwingungsanalyse (1)
- Schwingungsdämpfer (1)
- Sediment (1)
- Seismic Vulnerability (1)
- Selbstheilung (1)
- Shape optimization (1)
- Shear wave (1)
- Sicherheitsfaktor (1)
- Simulationsmodell (1)
- Simulationsprozess (1)
- Social Game (1)
- Software (1)
- Soil dynamics (1)
- Sowjetunion / GRU (1)
- St. John's University (1)
- Stabilisierung (1)
- Stadtentwicklung (1)
- Stadtgestaltung (1)
- Stadtklima (1)
- Stahlbeton (1)
- Stampflehm (1)
- Staumauer (1)
- Stifter (1)
- Straßenbeton (1)
- Straßenbetriebsdienst (1)
- Structural health monitoring (1)
- Strukturanalyse (1)
- Strukturdynamik (1)
- Strukturoptimierung (1)
- Studentenarbeiten (1)
- Stuttgart / Sonderforschungsbereich Rechnergestützte Modellierung und Simulation zur Analyse (1)
- Stärkefließmittel (1)
- Suffosion (1)
- Super Healing (1)
- Superplasticizer (1)
- Synthese (1)
- Talsperre (1)
- Termincontrolling (1)
- Thermoelasticity (1)
- Thermoelastizität (1)
- Thin shell (1)
- Thin-walled Structures (1)
- Thüringen (1)
- Thüringen im Nationalsozialismus (1)
- Tragfähigkeit (1)
- Träger (1)
- Tsallis entropy (1)
- UDDT (1)
- UML (1)
- Umweltbelastungspunkte (1)
- Unbewegliche Sache (1)
- Ungewissheit (1)
- Unschärfequantifizierung (1)
- Unterteilungsalgorithmen (1)
- Unterteilungsalgorithmus (1)
- Unterwasserarchitektur (1)
- Verallgemeinerte Technische Biegetheorie (1)
- Verbrauchszähler (1)
- Vergleichswerte (1)
- Vibration (1)
- Vibratory pile driving (1)
- Virtuelle Realität (1)
- Volumenstabilität (1)
- Vortex Particle Method (1)
- Vortex-induced vibration (1)
- Vulnerability (1)
- Wechselwirkung (1)
- Weimar / Bauhaus-Universität (1)
- Wind Energy (1)
- Wind Turbines (1)
- Wind load (1)
- Windenergie (1)
- Windlast (1)
- Windturbine (1)
- Wissenschaftliche Einrichtung (1)
- Wohnstandortentscheidungen (1)
- Wohnstandortpräferenzen (1)
- Zementbeton (1)
- Zementhydratation (1)
- Zensur (1)
- Zusatzmittel (1)
- Zuverlässigkeit (1)
- Zuverlässigkeitsanalyse (1)
- adaptive pushover (1)
- alkali-silica-reaktion (1)
- architecture and urban planning history of Shanghai (1)
- artificial intelligence (1)
- artificial neural networks (1)
- automatic modal analysis (1)
- backcasting (1)
- bauphysikalische Methoden (1)
- big data (1)
- bim; cad; citygml; gbxml; thermal design (1)
- bridge curb (1)
- bridge inspection (1)
- building information modelling (1)
- capitalization (1)
- capsular clustering (1)
- cement (1)
- circumferential contact length (1)
- climate change (1)
- climate loads (1)
- climatic loading (1)
- cluster analysis (1)
- clustering (1)
- complex data analysis (1)
- composite cement (1)
- computational design (1)
- computational hydraulics (1)
- concrete pavements (1)
- construction progress (1)
- cost estimation (1)
- cplan (1)
- critical path monitoring (1)
- curing compounds (1)
- damage identification (1)
- damage information model (1)
- dams (1)
- depthmapx (1)
- design synthesis (1)
- destructive testin (1)
- distributed computing (1)
- durability (1)
- effects of architecture (1)
- ereignisbasiert (1)
- evolutionary optimization (1)
- experiment (1)
- fiber optical Sensor (1)
- finite element method (1)
- fire (1)
- full-waveform inversion (1)
- genetic algorithm (1)
- genetic programming (1)
- grasshopper (1)
- gypsum (1)
- housing (1)
- iPiT® (1)
- iconic architecture (1)
- influence of architecture (1)
- integrated sanitation system (1)
- interactive (1)
- interaktiv (1)
- inverse analysis (1)
- isogeometric analysis (1)
- job description (1)
- long-term examination (1)
- maschinelles Lernen (1)
- material aging (1)
- metakaolin (1)
- microcapsule (1)
- microstructure (1)
- middleware (1)
- modal parameter estimation (1)
- modal tracking (1)
- modern architecture (1)
- mortar method (1)
- multi-objective optimization (1)
- nailed constructions (1)
- nailed trusses (1)
- new alternative sanitation systems NASS (1)
- non-destructive testing (1)
- nonstationarity (1)
- occupant requirements (1)
- occupant satisfaction (1)
- optimization (1)
- passive control (1)
- plasterboard (1)
- power theory of value (1)
- process optimisation (1)
- property sector (1)
- python (1)
- questionnaire (1)
- rapid assessment (1)
- rapid classification (1)
- recovery-based and residual-based error estimators (1)
- reinforcement learning (1)
- residential buildings (1)
- scheduling (1)
- secret service Soviet Union (1)
- seismic control (1)
- seismic hazard analysis (1)
- seismic risk estimation (1)
- self-healing concrete (1)
- semi-probabilistic concept (1)
- sequence (1)
- singular value decomposition (1)
- site-specific spectrum (1)
- slow-late-aggregate (1)
- smooth rectangular channel (1)
- space syntax (1)
- stabilisierter Lehm (1)
- stochastic subspace identification (1)
- strain (1)
- strategic limitation (1)
- stress (1)
- structural analysis (1)
- structural control (1)
- städtische Strukturen (1)
- supervised learning (1)
- tailings dam (1)
- tailings facility (1)
- tall buildings (1)
- tangible user interface (1)
- tuned mass damper (1)
- tuned mass dampers (1)
- urban planning (1)
- urban reagent (1)
- urban regeneration (1)
- urban research-quantitative (1)
- urban simulation (1)
- urban transformation (1)
- urban virus (1)
- wave propagation (1)
- zerstörungsfreie Prüfung (1)
- Äthiopien (1)
- Öffentliche Gebäude (1)
- Öffentliche Liegenschaften (1)
- Öffentlicher Sektor (1)
Superplasticizers are utilized both to improve the fluidity during the placement and to reduce the water content of concretes. Both effects have also an impact on the properties of the hardened concrete. As a side effect the presence of superplasticizers affects the strength development of concretes that is strongly retarded. This may lead to an ecomomical drawback of the concrete manufacturing. The present work is aimed at gaining insights on the causes of the retarding effect of superplasticizers on the hydration of Portland cement. In order to simplify the complex interactions occurring during the hydration of Portland cement the majority of the work focuses on the interaction of superplasticizer and tricalcium silicate (Ca3SiO5 or C3S, the main compound of Portland cement clinker). The tests are performed in three main parts accompanied by methods as for example isothermal conduction calorimetry, electrical conductivity, Electron Microscopy, ICP-OES, TOC, as well as Analytical Ultracentrifugation.
In the first main part and based on the interaction of cations and anionic charges of polymers, the interactions between calcium ions and superplasticizers are investigated. As a main effect calcium ions are complexed by the functional groups of the polymers (carboxy, sulfonic). Calcium ions may be both dissolved in the aqueous phase and a constitute of particle interfaces. Besides these effects it is furthermore shown that superplasticizers induce the formation of nanoscaled particles which are dispersed in the aqueous phase (cluster formation). Analogous to recent findings in the field of biomineralization, it is reasonable to assume that these nanoparticles influence the crystal growth by their assembly process.
Based on the assumption that superplasticizers hinder either or both dissolution and precipitation and by that retard the cement hydration, the impact on separate reactions is investigated. On experiments that address the solubility of C-S-H phases and portlandite, it is shown that complexation of calcium ions in the aqueous phase by functional groups of polymers increases the solubility of portlandite. Contrary, in case of C-S-H solubility the complexation of calcium ions in solution leads to decrease of the calcium ion concentration in the aqueous phase. These effects are explained by differences in adsorption of polymers on C-S-H phases and portlandite. It is proposed that adsorption is stronger on C-S-H phases compared to portlandite due to the increased specific surface area of C-S-H phases. Following that, it is claimed that before polymers are able to adsorb on C-S-H phases the functional groups must be screened by calcium ions in the aqueous phase. It is further shown that data regarding the impact of superplasticizers on the unconstrained dissolution rate of C3S does not provide a clear relation to the overall retarding effect occurring during the hydration of C3S. Both increased and decreased dissolution rate with respect to the reference sample are detected. If the complexation capability of the superplasticizers is considered then also a reduced dissolution rate of C3S is determined. Despite the fact that the global hydration process is accelerated, the addition of calcite leads to a slower dissolution rate. Thus, a hindered unconstrained dissolution of C3S as possibly cause for the retarding effect still remains open for discussion. In the last section of this part, the pure crystallization of hydrate phases (C-S-H phases, portlandite) is fathomed. Results clearly show that superplasticizers prolong the induction time and modify the rate of crystal growth during pure crystallization in particular due to the complexation of ions in solution. But this effect is insufficient to account for the overall retarding effect. Further important factors are the blocking of crystal growth faces by adsorbed polymers and the dispersion of nanoscaled particles which hinders their agglomeration in order to build up crystals.
In the last main part of the work, the previously gathered results are utilized in order to investigate hydration kinetics. During hydration, dissolution and precipitation occur in parallel. Thereby, special attention is laid on the ion composition of the aqueous phase of C3S pastes and suspensions in order to determine the rate limiting step. All in all it is concluded that the retarding effect of superplasticizers on the hydration of tricalcium silicate is based on the retardation of crystallization of hydrate phases (C-S-H phases and portlandite). Thereby, the two effects complexation of calcium ions on surfaces and stabilization of nanoscaled particles are of major importance. These mechanisms may partly be compensated by template performance and increase in solubility by complexation of ions in solution. The decreased dissolution rate of C3S by the presence of superplasticizers during the in parallel occuring hydration process can only be assessed indirectly by means of the development of the ion concentrations in the aqueous phase (reaction path). Whether this observation is the cause or the consequence within the dissolution-precipitation process and therefore accounts for the retarding effect remains a topic for further investigations.
Besides these results it is shown that superplasticizers can be associated chemically with inhibitors because they reduce the frequency factor to end the induction period. Because the activation energy is widely unaffected it is shown that the basic reaction mechanism sustain. Furthermore, a method was developed which permits for the first time the determination of ion concentrations in the aqueous phase of C3S pastes in-situ. It is shown that during the C3S hydration the ion concentration in the aqueous phase is developed correspondingly to the heat release rate (calorimetry). The method permits the differentiation of the acceleration period in three stages. It is emphasized that crystallization of the product phases of C3S hydration, namely C-S-H phases and portlandite, are responsible for the end of the induction period.
Some caad packages offer additional support for the optimization of spatial configurations, but the possibilities for applying optimization are usually limited either by the complexity of the data model or by the constraints of the underlying caad system. Since we missed a system that allows to experiment with optimization techniques for the synthesis of spatial configurations, we developed a collection of methods over the past years. This collection is now combined in the presented open source library for computational planning synthesis, called CPlan. The aim of the library is to provide an easy to use programming framework with a flat learning curve for people with basic programming knowledge. It offers an extensible structure that allows to add new customized parts for various purposes. In this paper the existing functionality of the CPlan library is described.
When working on urban planning projects there are usually multiple aspects to consider. Often these aspects are contradictory and it is not possible to choose one over the other; instead, they each need to be fulfilled as well as possible. In this situation ideal solutions are not always found because they are either not sought or the problems are regarded as being too complex for human capabilities.To improve this situation we propose complementing traditional design approaches with a design synthesis process based on evolutionary many-criteria optimization methods that can fulfill formalizable design requirements. In addition we show how self-organizing maps can be used to visualize many-dimensional solution spaces in an easily analyzable and comprehensible form.The system is presented using an urban planning scenario for the placement of building volumes.
The increasing success of BIM (Building Information Model) and the emergence of its implementation in 3D construction models have paved a way for improving scheduling process. The recent research on application of BIM in scheduling has focused on quantity take-off, duration estimation for individual trades, schedule visualization, and clash detection.
Several experiments indicated that the lack of detailed planning causes about 30% non-productive time and stacking of trades. However, detailed planning still has not been implemented in practice despite receiving a lot of interest from researchers. The reason is associated with the huge amount and complexity of input data. In order to create a detailed planning, it is time consuming to manually decompose activities, collect and calculate the detailed information in relevant. Moreover, the coordination of detailed activities requires much effort for dealing with their complex constraints.
This dissertation aims to support the generation of detailed schedules from a rough schedule. It proposes a model for automated detailing of 4D schedules by integrating BIM, simulation and Pareto-based optimization.
Viele Baudenkmale sind dem Konflikt aus baulichem Instandsetzungsbedarf für eine zeitgemäße Nutzung und einer sich möglicherweise daraus ergebenden Gefährdung der Denkmalsubstanz ausgesetzt. Gründe sind steigende Energiekosten für den Gebäudebetrieb, zeitgemäße Anforderungen an Behaglichkeit und Arbeitsschutz, sowie die Vermeidung von Schäden an der Substanz aufgrund baulicher Mängel des konstruktiven Wärme- und Feuchteschutzes. Gleichzeitig gilt für viele Bauten aber auch die Notwendigkeit regelmäßiger Nutzung und Bewirtschaftung, um den Erhalt überhaupt zu sichern. Die energetische Ertüchtigung von Baudenkmalen scheitert in diesem Spannungsfeld oft am unlösbaren Konflikt zwischen dem Erhalt der bauzeitlichen Substanz auf der einen und der notwendigen energetischen Optimierung der Gebäudehülle auf der anderen Seite. Zielsetzung dieser Fallstudie ist die beispielhafte Entwicklung einer bauklimatischen und denkmalgerechten Ertüchtigungsstrategie am Beispiel eines Verwaltungsgebäudes der Nachkriegsmoderne als Beitrag zur Lösung dieses Konfliktes.
Baulogistische Vorgänge sind in einer modern angelegten Baustelle der Schlüssel zu einer wirtschaftlichen Abwicklung. Dieses gilt nicht nur für den Rohbau, bei dem die sehr enge Verzahnung zwischen den Fertigungs- und Logistikprozessen auf der Baustelle zu beobachten ist, sondern noch mehr für die Ausbauphase, bei der vermeintlich unabhängig voneinander agierende Einzelunternehmen des Ausbaus auf engem Raum miteinander um die jeweils besten Liefer- und Montagebedingungen konkurrieren.
Ausgehend von einer aktuellen Großbaustelle in Jena werden verschiedene Varianten einer leistungsfähigen Baulogistik entwickelt und deren Implementierung auf der Baustelle vorbereitet werden.