Analysis of Mechanical Properties of Hydrothermally Cured High Strength Cement Matrix for Textile Reinforced Concrete

Abstract

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 × 160 mm 3 . 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 0.6 MPa, and 165°C at the age of 21 hours; the final compressive strength of cement matrix is 134.3 MPa and its flexural strength is 25.9 MPa (standard cured samples achieve 114.6 MPa and 15.7 MPa). Hydrothermal curing is even more effective for cement matrix reinforced by steel fibres (for example, the compressive strength can reach 177.5 MPa, while laboratory-cured samples achieve a compressive strength of 108.5 MPa).

Influence of Aggressive Environment on the Tensile Properties of Textile Reinforced Concrete

“…Performed experimental program follows a previous research [15,16], which was focused on the development of a cement matrix applicable for the TRC production. A new type of Portland cement matrix was formulated and its technological aspects were verified.…”

Controlled Hardening of Silicate Binders for the Optimization of High Performance Composites

“…Impressive initial values of flexural strength were reached as well. Hydration of binder system of common types of high strength composites is usually very fast and after a few days the composite reaches more than 90% of final values [3,9,10,11]. Due to application of advanced blend system the hydration continues.…”

Bond Characteristics of TRC Slabs Cured in Autoclave

“…Previous hydrothermal curing of composite used for purpose of this experiment confirmed this phenomenon. This contribution follows the research activity [10] focused on determination of optimal boundary conditions of TRC´s hydrothermal curing and age of concrete when the process should starts. Optimal conditions according to evaluation of previous results are 0.45 MPa and 150 °C for four hours.…”