Abstract
The main objective of this article is to describe the influence of hydrothermal curing conditions in an autoclave device (different pressure and temperature), which took place at various ages of a fresh mixture (cement matrix – CM, and fibre-reinforced cement matrix – FRCM), on textile reinforced concrete production. The positive influence of autoclaving has been evaluated through the results of physical and mechanical testing – compressive strength, flexural strength, bulk density and dynamic modulus of elasticity, which have been measured on specimens with the following dimensions: 40×40×160mm<sup>3</sup>. In addition, it has been found that increasing the pressure and temperature resulted in higher values of measured characteristics. The results indicate that the most suitable surrounding conditions are 0.6MPa, and 165 °C at the age of 21 hours; the final compressive strength of cement matrix is 134.3MPa and its flexural strength is 25.9MPa (standard cured samples achieve 114.6MPa and 15.7MPa). Hydrothermal curing is even more effective for cement matrix reinforced by steel fibres (for example, the compressive strength can reach 177.5MPa, while laboratory-cured samples achieve a compressive strength of 108.5MPa).
Highlights
Current research activities in the field of material science and civil engineering focus on investigations into the properties of advanced materials and their implementation into real practical use
It is necessary to say that all testing of the mechanical properties of the hydrothermally cured specimens was performed on the day following the hydrothermal curing process
The dependence of the compressive strength of CM (Figure 4) and FRCM (Figure 5) on pressure and on temperature is expressed in graphs for better illustration
Summary
Current research activities in the field of material science and civil engineering focus on investigations into the properties of advanced materials and their implementation into real practical use. In the context of sustainability and global efforts to minimize energy intensity, new types of cement composites and special curing conditions to help achieve higher mechanical properties and durability are investigated. This paper deals with an experimental analysis of the influence of hydrothermal curing on the mechanical properties of cement matrix for textile reinforced concrete. The aim of this study is to quantify the mechanical properties of textile reinforced concrete cement matrix autoclaved under various boundary conditions (pressure in autoclave vessel and age of concrete). Hydrothermal curing took place at various ages after the first contact water of with cement (from 12 to 24 hours). Two types of concrete were used (cement matrix and fibre-reinforced cement matrix)
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