Technobius

Mineral powder based on basalt insulation waste for asphalt concrete

2024-06-14T13:38:11+05:00

The article discusses the composition and production technology of mineral powder using waste basalt insulation. This study aims to confirm the hypothesis about the possibility of using basalt waste in the production of mineral powder with technical parameters corresponding to approved standards for the production of asphalt concrete. For definition of qualitative indicators of the received product in comparison with the control sample the researches of the basic indicators of mineral powder according to operating norms are given. Such indicators as grain composition of mineral powder, porosity and density were determined, indicating a more dense structure of the developed composition: the content of particles finer than 0.125 mm – 91.4 %, finer than 0.063 mm – 82.2 % with porosity index 28.1 % and true density 2.49 g/cm³. It was found that the mineral powder from waste basalt mineral slabs has a uniform and balanced grain distribution. At moisture content of samples less than 0.1 % by weight the bitumen capacity index of the tested mineral powder sample in comparison with the control sample showed better value by 2 g, at the same time the degree of swelling of samples from the mixture of powder and bitumen showed better result by 0.1 %. The obtained results indicate that the mineral powder on the basis of waste is able to hold bitumen well on its surface, which contributes to the improvement of adhesion between bitumen and mineral particles. The lower degree of swelling characterizes the increased water resistance and frost resistance of asphalt concrete with the use of this mineral powder. Considering that basalt mineral slabs are waste, their use in the production of mineral powder for asphalt concrete fits into the concept of sustainable construction and can contribute to waste reduction and environmental sustainability of the construction process.

Experimental study of sound wave propagation patterns

2024-07-23T13:26:35+05:00

The present study compares the behavior of different sound types and their sources concerning distance. Experimental findings demonstrate a consistent reduction in noise levels with increasing distance from the sound origin, aligning with anticipated sound propagation patterns. Median noise level reductions are quantified, showing decreases from 72.7 dB at the source to 54.8 dB at a distance of 3 m. Pulsed sounds exhibit pronounced fluctuations and peaks at close distances, while steady and blended sounds maintain more uniform levels. An exponential model accurately characterizes the noise reduction phenomenon (R² = 0.8664), underscoring its applicability for construction noise control. These results offer valuable insights into sound propagation dynamics and provide a basis for developing effective noise control strategies.

Alkali-activated composites with synthetic fibers and recycled aggregates: a study of mechanical properties

2024-06-27T12:04:05+05:00

This study examines the potential for enhancing alkali-activated composites (AACs) through the incorporation of a blend of meta-zeolite (MZ) and slag, reinforced with synthetic fibers and incorporating aluminum sludge (AS) and recycled concrete aggregate. AACs were activated with sodium hydroxide (NaOH) and sodium silicate (Na₂SiO₃) in varying ratios and molarities (8M to 14M). The optimal mix, comprising 50% MZ and 50% S at 12M NaOH with 30% AS, exhibited notable enhancements in mechanical properties. Specifically, the addition of 0.5% basalt fibers resulted in a 7.26% increase in compressive strength and a 24.15% enhancement in flexural strength. These findings underscore the potential of MZ-S-based AACs, enhanced with aluminum sludge and basalt fiber, to develop advanced, sustainable construction materials. The study underscores the significance of optimizing material ratios and reinforcement strategies to achieve superior performance, thereby contributing to the development of environmentally friendly building solutions that align with contemporary standards.

Effect of heat treatment of expanded polystyrene concrete on its compressive strength

2024-07-07T15:35:35+05:00

The purpose of this research was to identify the effect of heat treatment of heat-insulating concrete on its compressive strength. For comparison, samples of normal hardening and samples that have undergone heat treatment were used. Lightweight heat-insulating concrete based on cement, polystyrene, and industrial waste was used as the subject of the research. A steaming chamber was used for steaming concrete; tests of the mechanical strength of concrete were carried out on a hydraulic press. All tests were carried out under laboratory conditions. Studies have shown that the density of polystyrene concrete after heat treatment is 7% lower than that of polystyrene concrete hardened under normal conditions. During heat treatment, the crystal structure of the material changes, which affects its final properties. This is proved by the fact that the strength of polystyrene concrete after heat treatment is 30% higher.

Study of the causes of the collapse of a high-rise chimney under conditions of long-term operation

2024-06-30T00:04:31+05:00

This article analyzes the causes of the collapse of a high-rise chimney in Petropavlovsk. A study of the factors of long-term (over 60 years) operation of a high-altitude (H=150 m) chimney was carried out. The analysis of the constructive solution of the pipe was carried out, and the study of the operating conditions was performed. To theoretically assess the technical condition and stress-strain state factors (SSS) of the collapsed chimney, automated verification calculations were carried out based on the actual parameters and characteristics obtained during the last technical inspection. An automated verification calculation of SSS factors determining the bearing capacity of an object (its strength, rigidity, reliability, and durability) has been performed. Theoretically, the physical wear of the object has also been carried out. Based on the study of the available technical documentation and conducting a continuous, detailed instrumental examination of the facility, the expert organization established the significant causes that led to the pipe accident.