Course detail

Concrete Technology 3

FAST-CJ013Acad. year: 2024/2025

Current trends in the field of technology of concrete bring new types of concrete with high end-use properties, using higher proportion of waste materials and focus on the structural side of buildings as well as overall aesthetic perception of concrete structures. In the course of classes and practical exercises, students will become acquainted with specifying, designing and using of concrete with high proportion of fly ash, ultrahigh performance concrete, reactive powder composites, sprayed concrete for tunnel construction, and selected types of mixtures for road building and current trends of direct finish concrete. Methods of designing composition of binding matrix based on achieving maximal density of matrix through use of micro-additions and controlled thickness of interfacial transition zone will be explained as well as influence of hydration heat on rheology of fresh mortar in time, its regulation by means of various superplasticizers, use of nano-technologies in concrete and many others.
Classes are complemented with laboratory exercises.

Language of instruction

Czech

Number of ECTS credits

4

Mode of study

Not applicable.

Guarantor

prof. Ing. Rudolf Hela, CSc.

Department

Institute of Technology of Building Materials and Components (THD)

Entry knowledge

Basic knowledge gained in courses Technology of Concrete 1 and 2, Mortars 1 and 2, Composite materials, Durability of building materials. Knowledge of current modern trends is important for achieving special and extreme final properties, reduction of production cost and minimizing ecological load. Basic knowledge about the influence of the character of micro-structure of cement stone on physico-mechanical properties (content and distribution of micro and macro pores, interfacial transition zones between aggregate grains, influence of water-cement ratio on properties of fresh and hardened concrete is necessary. Basic knowledge of rheology of fresh concrete, ways of its measuring, behavior and effect of superplasticizers in concrete are also important.

Rules for evaluation and completion of the course

Extent and forms are specified by guarantor’s regulation updated for every academic year.

Aims

Not applicable.

Study aids

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Not applicable.

Recommended reading

Not applicable.

Type of course unit

 

Lecture

26 hod., optionally

Teacher / Lecturer

prof. Ing. Rudolf Hela, CSc.

Syllabus

1. Rheology of fresh cement mortars – Newtonian, non-Newtonian, Bingham liquid, models, influences on rheology changes. 2. Methods of measuring rheology of cement based and modified suspensions, influence of temperature and superplasticizers on change of rheology in time, influences on development of hydration heat and mechanical properties of hardened mortars. 3. Possibilities of using admixtures for concrete and plasticizers for reduction of volumetric changes, development of temperature during hardening of concrete, optimization of development of strengths for placing of concrete of high volume constructions. 4. Theory of designing composition of special concrete with micro-additions, optimization of density of dry components in binding matrix, granulometric curves in binding system for particles up to 0.25mm. 5. Influence of minimization of void content of components in binding matrix on thickness and quality of the interfacial transition zone between aggregate grains and influence on properties of hardened concrete. 6. Concrete with high content of fly ash (UHVFAC), designing composition, defining properties of fly ash, properties of fresh and hardened concrete, field of application. 7. Ultra high performance concrete (UHPC - 120 – 160 MPa), principles of designing mixtures, field of application, influence of compressive strength on other properties of concrete, like static elasticity modules, resistance to aggressive environment etc. 8. Reactive Powder Composites (RPC), principle of behavior, selection of appropriate fillers, physico-mechanical properties. 9. Types of materials for stabilized base layers of roads, cemented and non-cemented with hydraulic binders. 10. Educational visit 11. Technology of sprayed concrete, description of the variant of dry and wet sprayed concrete, designs of composition, required properties, methods of testing rapidity of strength development. 12. Ecologically friendly concrete (Green Concrete) with recycled filler and low-clinker cements, future prospects of keeping the sustainable development of concrete building industry. 13. Special treatment of surface of architectural concrete –translucent, self-cleaning, graffiti concrete.

Exercise

13 hod., compulsory

Teacher / Lecturer

prof. Ing. Rudolf Hela, CSc.

Syllabus

1. Opening exercise. Introduction into laboratory rules and H&S, content of exercises and conditions of crediting 2.-3. Design of composition of concrete using micro-additions with the aim of optimization density of cement stone and thickness of interfacial transit zone. 4.-5. Design of composition of concrete with carbon nano-tubes, ways of mixing, verification of influence on strengths after 7, 28 and 60 days, verification of frost-resistance of concrete. 6.-7. Ultrahigh performance concrete – manufacture of mortars in the UHPC composition and combined with classic cement mortars. Ageing of test specimens in various conditions (water, autoclaving) and determining influence on final properties. 8.-9. Design of composition of stabilizations for base layers of roads cemented with hydraulic binders, verification of basic mechanical properties. Mixtures always designed with secondary raw materials. 10. Educational visit 11.-12. Sprayed concrete. Verification of functionality and effectiveness of various types of accelerators, study of development of temperature during accelerated hardening and methods of testing strengths of sprayed concrete at early age. 13. Credit test