Cement-Free Refractory Concretes. Part 7. Concrete Mix Properties and their Grain Size Distribution

Ordinary refractory ceramics are multi-phase materials, and their inhomogeneous microstructures induce the scatter of properties. The definition of a reasonable number of samples is important to obtain representative results from experiments and simulations, and this reasonable number might be property or microstructure relevant. Stochastic discrete element (DE) simulations of cold crushing tests with homogeneous interface properties were performed. Three minimum DE size ranges were used to represent matrix variation at different levels. Statistical methods, i.e., Kolmogorov–Smirnov (K–S) test, t-test, and correlation analysis, were utilized to study the influences of minimal number of samples on mechanical properties and crack density. It revealed that a relatively small number of samples are sufficient to obtain representative cold crushing strength (CCS) and Young’s modulus, whilst a large number of samples are favourable when the fracture energy and crack density under cold crushing conditions are of interest. The analysis also showed that the fracture energy under cold crushing condition generally correlates positively with CCS, and the static Young’s moduli determined from the stress–piston displacement curves with different definitions are divergent, caused by contact compliance and premature cracking. The data from the stress–strain curves recorded directly on the sample are required for the accurate static Young’s modulus calculation.

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Dry masonry mixtures based on siliceous opal-cristobalite rocks for clinker bricks

Zemlyanskaya,

Lapunova,

Semenova

2024

Construction Materials and Products

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Clinker bricks have always attracted consumers with their high physical and mechanical characteristics: strength, dense structure, frost resistance, low water absorption values. In recent years, enterprises producing ceramic materials have begun to look for the opportunity to produce these products in Russia. With increased demand for clinker bricks, a technology has emerged for creating large-sized clinker stones which feature increased voids – 60-80%, an average density of 450-700 kg/m3 and thermal conductivity of 0.8-0.11 W/(m·°C), and a compressive strength of 10-30 MPa. The use of such wall products in construction projects predetermines specific building mixtures for masonry work that would meet the required values for strength, water absorption, vapor permeability and, at the same time, would have reduced thermal conductivity characteristics. To develop such masonry mortars, it is necessary to select the grain composition of quartz sand for building mixtures to ensure structural strength indicators. Thus, the research aims at finding lightweight aggregate and increasing porosity in order to improve the heat-shielding properties of clinker brick masonry and clinker high-hollow large-sized blocks.

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Cement-Free Refractory Concretes. Part 7. Concrete Mix Properties and their Grain Size Distribution

Cited by 3 publications

References 25 publications

Cement-Free Refractory Concretes. Part 12-2. Siliceous Composition HCBS and Ceramic Concretes

Cement-Free Refractory Concretes. Part 12-2. Siliceous Composition HCBS and Ceramic Concretes

Statistical study of mechanical responses of ordinary refractory ceramics under cold crushing condition with discrete element modelling

Dry masonry mixtures based on siliceous opal-cristobalite rocks for clinker bricks

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