Maria Kaszynska

West Pomeranian University of Technology, Szczecin · Faculty of Civil Engineering and Architecture

Over a million people die in road crashes and tens of millions result injured or disabled each year, globally. Hence, there is a constant concern for improving the safety of the roads to protect road users, and those at the most risk, the road workers. Construction, maintenance, and utility work are constantly needed to ensure safety and functional...

3D concrete printing technology of cementitious materials is challenging in many aspects. Despite the workability and mechanical properties of a mix and hardened concrete or mortar, the researchers need to face problems with environmental impact and durability of printed elements. Furthermore, today thousands of tons of waste are produced and natur...

This study determines the effect of spent garnet as a replacement for natural sand in 3D-printed mortar at early ages. Five mixes with different spent garnet amounts were prepared (0%, 25%, 50%, 75% and 100% by volume). The ratio of binder to aggregate remained unchanged. In all mixes the water/binder ratio was assumed as a constant value of 0.375....

The presented research’s main objective was to develop the solution to the global problem of using steel waste obtained during rubber recovery during the tire recycling. A detailed comparative analysis of mechanical and physical features of the concrete composite with the addition of recycled steel fibres (RSF) in relation to the steel fibre concre...

Use of recycled materials and incorporation of sustainable development ideas are one of the most popular trends in civil engineering. The 3D concrete printing technology which has been developing rapidly in recent years can benefit from use of both of them. The study evaluates the possibility of using PET granules in mixes suitable for 3D printing....

Despite the rapid development of 3D printing technology for cement composites, there are still a number of unsolved issues related to extrusion printing. One of them is proper mix design that allows for meeting criteria related to the printing of cementitious materials, such as pumpability, buildability, consistency on the materials, flowability an...

The design of proper mixes for 3D concrete printing has been already a subject of many studies. Modification to mixes aim to obtain certain properties (extrudability, workability, flowability, open time or buildability) which allow for proper printing of the material. There are different types of reactive or non-reactive mineral additives that were...

Concrete shrinkage is a phenomenon that results in a decrease of volume in the composite material during the curing period. The method for determining the effects of restrained shrinkage is described in Standard ASTM C 1581/C 1581M–09a. This article shows the calibration of measuring rings with respect to the theory of elasticity and the analysis o...

The influence of rebar, protruding from concrete element during casting, on temperature and strength development was analyzed. Test models of size 50 cm x 50 cm x 50 cm were made with and without protruding rebar. The rebar protruding from the sample simulated the conditions of the hardening of elements such as bridge abutments or pylons, which req...

Technological developments in construction have led to an increase in the use of 3D modelling using CAD environments. The popularity of this approach has increased in tandem with developments in industry branches which use 3D printers to print concrete based printing materials in construction, as these allow freedom in shaping the dimensions of sup...

In this study, gypsum plasters enriched with the modified photocatalyst TiO2/N and additive components were prepared and analyzed in detail. The aim of this work was to recognize the combined impact of a photocatalyst, polycarboxylic superplasticizer (SP), and glass fiber (F) on the properties of the composed building materials. The mutual compatib...

The concrete during the curing exhibits volume changes caused by different factors: chemical reactions during hydration, surface drying, external temperature or carbonisation. Each aforementioned factor imposes different type of shrinkage that constitutes to the overall shrinkage of concrete. In case of the concretes with a low water/cement ratio,...

Lightweight self-consolidating concrete (LSCC) is an attractive construction material combining the benefits of self-consolidating and lightweight concrete. The material is especially beneficial for structures in which reduced load and ease of construction among dense reinforcement are needed. While a great potential for lightweight self-consolidat...

A new trend in concrete technology is to introduce photocatalytic concrete, also known as a self-cleaning concrete. This technology is based on the addition of TiO2 (titanium dioxide) to concrete mixes. Photocatalytic activity of TiO2 and its hydrophilic properties make it suitable for addition to building materials, particularly in architectural c...

The article presents overview of additive manufacturing for concrete structures. Study focuses on specific tests used to determine suitability of high performance mixes for 3D printing. The tests include determination of compressive strength and evaluation of printing speed, extrudability and overall surface quality. Tests were performed on a High-...

Paper presents the analysis of shrinkage development in selfconsolidating concretes (SCC). Concretes were cured for 28 day in an insulated environment. The shrinkage was tested on 35x150x1150 mm samples. The specimen had the same volume as ring specimen proposed in the ASTM method of testing the susceptibility of concretes to cracking caused by the...

There are several calculation models for estimation of shrinkage in concrete. The most popular ones are: ACI-209R-92 method, Bažant-Baweja model (B3), Gardner’a-Lockman’a model (GL 2000), CEB-FIP (CEB MC90-99), Spanish model (EHE), EuroCode method (EC-2) from 2004 and Tazawa–Miyazawa model (JSCE). Majority of aforementioned models do not include th...

The 3D Printing of cement composites is one of the fastest developing technologies of modern concrete. The 3D printing involves concretes with high amounts of microfillers. The study analyses the influence of curing conditions on the development of strength of concretes applicable in 3D printing. Ten mixes were tested in the study. In the studied c...

High-performance concrete (HPC) which contains increased amount of both higher grade cement and pozzolanic additives generates more hydration heat than the ordinary concrete. Prolonged periods of elevated temperature influence the rate of hydration process in result affecting the development of early-age strength and subsequent mechanical propertie...

The Fibre Reinforced Polymer (FRP) composite rebar has been used in civil engineering structures for several years. It has many characteristics, which not only are equal to those of steel rebar, but significantly surpass them. The composite rebar has high corrosion resistance, electromagnetic neutrality and has much higher tensile strength than ste...

Cracking is one of the main reasons for reduction of concrete durability, as it allows for penetration of water and aggressive chemicals leading to corrosion of rebars, deterioration and structural failure. Recently, rapid new developments in the new generation of concrete reveal the need for a better assessment of shrinkage and its effect on struc...

This paper presents a part of the results from a broader study dealing properties of lightweight self-consolidating concrete. Various self-consolidating mixtures were considered by replacing a part of fine and coarse aggregate with light-weight aggregate. The workability of SCC was evaluated using the slump flow test, V-fimnel test and J-ring test....

The latest trend in concrete technology is the development of self-compacting lightweight high-performance concrete which combines the favourable properties of lightweight high-performance concrete with those of self-compacting concrete. This paper presents test results of self-compacting concrete with a variable share of lightweight aggregate, rep...

The latest trend in concrete technology is the development of Self–Compacting Lightweight High-Performance Concrete. This concrete combines the favorable properties of lightweight concrete (LWC) with those of self-compacting concrete (SCC). Comparison of these two types of concrete indicates that lightweight self-compacting concrete has characteris...

Self-Compacting or Self-Consolidating Concrete (SCC) has been described as "the most revolutionary development in concrete construction for several decades". The flow characteristics and viscosity of SCC can be modified by changing the type of ingredients and their composition as well as by changing the mixing, curing, transportation and placing co...

There is a growing need for a more efficient approach to evaluation and repair of existing structures. Damaged bridge deck slabs and girders are repaired by removing debris, placing additional reinforcement, splicing broken prestressing tendons, and filling the gaps with concrete or epoxy resin. Test results are presented for verification of the pe...

The optimum safety level depends on the consequences of failure and cost of safety. Selection of the target value can be based on consideration of these two parameters. Target reliability indices calculated for newly designed bridges and existing structures are different for many reasons. Reference time period is different for newly designed and ex...

The structural performance depends on load and resistance parameters. These parameters are time-varying random variables. Therefore, reliability can be utilized as a rational measure of structural performance. This paper is focused on the effect of material related parameters on the reliability of concrete components. Properties of concrete change...

Self-compacting concrete can by made in various ways. The optimum mixtures are sensitive with regard to characteristics of components, such as type of the cement, type and amount of superplasticizer, type of sand and fillers. The fabrication of self-compacting concrete requires a more rigorous quality control of materials and selection of the mixtu...

Analyses and results of tests on heat of hydration and compressive strength of high-performance concrete cured in variable thermal conditions are presented in this paper. Investigations of hydration heat of cement were carried out in calorimeter, in adiabatic conditions. Test samples for strength tests were stored in isothermal conditions at temper...

Analyses and results of tests on heat of hydration and compressive strength of concrete cured in variable conditions are presented in paper. Various initial temperatures of concrete mixes were adopted in the tests. Investigations of hydration heat of cement were carried out in calorimeter, in adiabatic conditions, giving upper evaluation of the amo...