Papers by Keyword: Compression Resistance

Abstract: The current and significant environmental pollution caused by the use of cement in structural construction highlights the need for more sustainable alternatives. This research evaluates the use of uncalcined scallop shell powder (SP) and recycled glass powder (GP) as partial replacements for cement in conventional concrete mixes with a design strength of f'c = 280 kg/cm². SP and GP were incorporated in a 2:1 ratio at the following replacement levels: 2.5% SP + 5% GP and 5% SP + 10% GP. The analysis conducted on the concrete includes CO₂ emissions associated with its production, workability in its fresh state, and compressive strength in its hardened state. As a result, the mix with the lower replacement percentage proved to be the most optimal, achieving a 1-inch increase in workability and a 2.49% increase in 28-day compressive strength compared to the control mix, along with a 1.08% reduction in CO₂ emissions. This demonstrates the structural and environmental viability of concrete incorporating SP and GP.

Abstract: This article discusses improving the low compression resistance of adobe houses in Saylla, Cusco, by incorporating fiberglass. It reviews studies employing synthetic materials and suggests adobe blocks with varying proportions of fiberglass. These adobe blocks to be studied will be produced in a traditional, regulated manner, with the addition of fiberglass at 0.10%, 0.50%, and 1.00%. Three samples of each type will be tested for reliable results. Compression tests show that traditional adobe fails to meet standards, while regulated adobe with fiberglass significantly enhances resistance. Adding 1.00% fiberglass results in a 123.20% increase in compression strength, reaching 1.634 MPa. The study concludes that fiberglass effectively strengthens adobe, providing practical applications for sustainable construction in Saylla, Cusco.

Abstract: The principal directions in the development of construction material industry include expansion of raw material sources, quality improvement of raw materials subjected to preliminary treatment, application of modifying components, constructive and technological modernization of manufacturing process. Manufacturing of ceramic bricks is one that dominates this industry. We know that there isn’t enough conditional clay suitable for ceramics production in most East regions of Russia and West Siberia. However, in many regions there are powerful heat power plants and highly-developed metallurgical enterprises, which produce sideline products alongside with basic output. The issue of complex utilization of wastes produced by power engineering and metallurgy has not been successfully resolved yet. Slag and other silica-containing sideline products of main production have not practically been used to the full. Nevertheless, it’s necessary to note, that disperse condition of silica-containing wastes as well as their physical and chemical characteristics predetermine prospective application of silica-containing materials in ceramics.

Abstract: Industrial transition to a totally new level of resources and energy saving necessitates improving the technical level of building materials manufacturing, growing their raw materials base, the assortment, enhancing the quality of manufactured products, cutting their cost price. It requires, first of all, carrying out more detailed research in properties of clay and clay loams, and selecting optimal additives for pottery works. Such disadvantages of clays as burning sensitivity, low compression resistance and flexural strength in a burnt state, low frost resistance cause the impossibility of their application without corrective additives. It is quite difficult to find an additive which can solve all the technological problems mentioned above. This paper provides the development of mixture "clay – electro-melting slag" for ceramic brick, moreover, addition of a steel-smelting slag in the fusion mixture results in the change in mixing water content of ceramic masses, strength and coloration of ceramic samples.

Abstract: The chemical compositions of the Yellow River silt, coal gangue, air-float algae slag and the effect in pavement brick making were analyzed. The main factors which effect the compressive strength of the pavement brick was researched. The best pavement brick factor level combination by orthogonal experimental design was determined. The effects of air-float algae cement addition and sintering temperature on the compression resistance of the brick were discussed.

Abstract: The Calcium Phosphate Cement (CPC) are bone substitutes with great potential for use in orthopedics, traumatology and dentistry due to its biocompatibility, bioactivity and osteoconductivity, and form a paste that can be easily shaped and placed into the surgical site. However, CPCs have low mechanical strength, which equals the maximum mechanical strength of trabecular bone. In order to assess the strength and time to handle a CPC composed primarily of alpha phase, were added sodium alginate (1%, 2% and 3% wt) and an accelerator in an aqueous solution. The cement powder was mixed with liquid of setting, shaped into specimens and evaluated for apparent density and porosity by Archimedes method, X-ray diffraction and compressive strength. A significant increase in compressive strength by adding sodium alginate was verified.

Abstract: This research presents some features about juniper timber, above all related with aspects of its structural use (for supports, pillars, beams, roofs...) in some vernacular architecture. Therefore, a special attention is driven to botanical, technical, mechanical features, typical for this type of rare wood. Its traditional use in the Iberian Peninsula and throughout the Mediterranean Basin is still visible in some cases of study, presented in the research. Good constructive qualities make juniper timber a great candidate for further test-researches and experiments, focalized on the family of traditional and”ever green “constructive materials.

Abstract: The ability of magnetorheological(MR) fluids to resist compression in the direction of magnetic field was tested to investigate the quasi-static squeezing process of MR fluids. A experiment setup was designed and fabricated to test the compression characteristics. Under the different magnetic flux density, the curves of the MR fluids were studied for yield stress versus compression stress, compression stress versus compression strain. The compression resistance of MRF was then measured for the different magnetic flux density for comparison with the shear yield strength of the same magnetic field. The results showed that the compression resistance of the MRF was much stronger than its shear yield stress for the same magnetic field strength conditions. The compression resistance of MRF can be utilized to design new magnetorheological devices.