Bachelor's Thesis

Development of cement mixture recipes for 3D printing technology

Author of thesis: Bc. Tomáš Černý

Acad. year: 2025/2026

Supervisor: prof. Ing. Rudolf Hela, CSc.

Reviewer: Ing. Vlastimil Hela, Ph.D.

Abstract:

The bachelor's thesis focuses on the issue of the possible use of fine-grained concretes available at conventional concrete plants with a maximum aggregate grain size of 8 mm for 3D printing technology. The theoretical part describes the issue of 3D printing properties and the influence of coarse aggregate on key properties in this process. Furthermore, the design approach methods are described, based on which the design methodology is selected in the practical part of the thesis. According to the chosen procedure, reference designs were developed for various combinations of materials and their subsequent optimized variants with the incorporation of coarse aggregate. The aim of the bachelor's thesis was to design recipes with coarse aggregate and then select suitable recipes for test printing based on the determined results.

Keywords:

3D printing concrete, additive manufacturing, 2K technology, mixtures for 3D printing, coarse aggregate, buildability

Date of defence

15.06.2026

Date of publish

14.06.2029

Result of the defence

Defended (thesis was successfully defended)

znamkaAznamka

Grading

A

Process of defence

Student představil komisi formou prezentace svoji bakalářskou práci a reagoval na připomínky a dotazy od oponenta vyjádřené v oponentském posudku i na otázky členů komise, zodpověděl i otázku od vedoucího práce. Během obhajoby položili členové komise následující otázky: Ing. Aleš Jakubík, Ph.D. – Šlo by pracovat s Vaší metodikou k návrhu konkrétního betonu (pevnostní třídy)? Ing. Pavla Matulová, Ph.D. – Ekonomické zhodnocení z čeho jste vycházel? Opravdu by vaše směs vycházela až 10x levněji než komerční směs? prof. Ing. Rudolf Hela, CSc. – Rozdíl cen je opravdu tak velký z důvodu nesušení surovin do pytlované směsi. prof. Ing. Jiří Zach, Ph.D. – V čem se vaše receptury lišily od základní receptury firmy ICE? Jaký byl jejich přínos? Jak byste popsal zkoušení reaktivity urychlovače s cementy? prof. Ing. Karel Dvořák, Ph.D. - Můžu se Vás zeptat na ekologičnost těchto systémů? Jsou opravdu tak dobré a ekologické podle Vás? Student výborně reagoval a zaujímal svoje stanovisko ke všem připomínkám k předložené BP od oponenta i členů komise.

Language of thesis

Czech

Faculty

Fakulta stavební

Department

Institute of Technology of Building Materials and Components

Study programme

Civil Engineering (BPC-SI)

Specialization

Building Materials and Technologies (M)

Composition of Committee

Ing. Aleš Jakubík, Ph.D. (předseda)
Ing. Pavla Matulová, Ph.D. (místopředseda)
prof. Ing. Rostislav Drochytka, CSc., MBA, dr. h. c. (člen)
prof. Ing. Rudolf Hela, CSc. (člen)
prof. Ing. Jiří Zach, Ph.D. (člen)
prof. Ing. Karel Dvořák, Ph.D. (člen)
doc. Ing. Radomír Sokolář, Ph.D. (člen)

Supervisor’s report
prof. Ing. Rudolf Hela, CSc.

Grade proposed by supervisor: A

File inserted by supervisor Size
Posudek vedoucího práce [.pdf] 132,40 kB

Reviewer’s report
Ing. Vlastimil Hela, Ph.D.

Grade proposed by reviewer: A

File inserted by the reviewer Size
Posudek oponenta [.pdf] 64,50 kB

Reasons for publication postponement

Publication of the final thesis has been postponed in compliance with the provisions of Section 47b (4) of Act No. 111/1998 Coll., on the Higher Education Institutions and on amendments and supplements to other acts, as amended. The deferred work is processed in cooperation with ICE Coral company. In this work knowledge and know-how of this company was used, which does not agree with publication of these facts.

Responsibility: Mgr. et Mgr. Hana Odstrčilová