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Basalt was used as an ornamental stone in many historic and ancient cities in Jordan. Measuring the uniaxial compressive strength (UCS) and the tangent Young's modulus (E t) in the laboratory ...
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This study investigates the potential use of basalt powder as a sole precursor or blended in high amounts in slag-based alkali-activated systems. Eight alkali-activated mixes are prepared and comprehensively analyzed to determine the compressive strength development and microstructural characterization of basalt powder-based and …
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The dynamic compressive strength factor for the. granite was less than 1; for the basalt, 1.35; for the limestone, 1.52; and for the tuff, 1.7^-« The compressional wave velocity of. rock is affected by increases in both the applied axial stress and. confining pressure. Velocities …
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Aggregates are necessary materials for the construction industry. Owing to their favourable properties, andesites are frequently used rock materials; hence, the investigation of their mechanical and aggregate properties has great significance. This paper introduces the analyses of 13 Hungarian andesite lithotypes. The samples were …
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Compared with the compressive strength 250 MPa of basalt at 25℃, the compressive strength σ c after heat treatment at 200 ℃ and 400 ℃ increases by 10.50% and 15.85%, respectively. The main reason is that the expansion of mineral particles causes the gradual closure of primary fractures, which increases the compactness of …
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Uniaxial compressive strength ( ... Basalt 145 50 347 25 207 82 395 3 (17) Diabase, dolerite 229 88 384 13 152 81 537 5 15.2 Hyperite - - - - 245 108 441 2 ure Graywacke 81 25 310 12 - - - - Sandstone 109 28 257 95 147 28 189 5 18.8 Siltstone 89 31 350 14 - - - - …
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Strength (MPa) Point Load Index (MPa) Field estimate of strength Examples R6 . Extremely. Strong > 250 >10: Specimen can only be : chipped with a : geological hammer: Fresh basalt, chert, diabase, gneiss, granite, quartzite R5 ; Very: strong: 100 -250 4 -10 Specimen requires many blows of a geological : hammer to fracture it: Amphibolite ...
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The aim of this study is to understand the strength behaviour and fragment size of rocks during indirect, quasi-static and dynamic tensile tests. Four rocks with different lithological characteristics, namely: basalt, granite, sandstone, and marble were selected for this study. Brazilian disc experiments were performed over a range of strain rates …
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Empirical relationships for estimating Uniaxial Compressive Strength (UCS) of rock from other rock properties are numerous in literature. This is because the laboratory procedure for determination of UCS from compression tests is cumbersome, time consuming, and often considered expensive, especially for small to medium-sized …
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The results showed that the inflection point on the strength-erosion age curve for basalt fiber reinforced concrete appeared significantly later than that in ordinary concrete, indicating that basalt fiber can delay sulfate erosion and enhance concrete durability. Using the measured sulfate erosion depth, remaining compressive strength …
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In this study, ASTM Class C fly ash used as an alumino-silicate source was activated by metal alkali and cured at low temperature. Basalt fibers which have excellent physical and mechanical properties were added to fly ash-based geopolymers for 10–30% solid content to act as a reinforced material, and its influence on the compressive …
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The relative residual splitting tensile strength increases as the basalt fibre content increases. Nano-silica is generally beneficial to the improvement of the compressive strength at different temperatures. The results indicate that basalt fibre and nano-silica contribute to the improvement of the interface transition zone performance and to ...
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Let's discuss some physical properties of basalt: Rock Hardness . Rock Hardness property is usually measured to determine the compressive fracture strength, to determine whether a rock is a soft rock or a hard rock. The rock hardness of basalt is 6 as per the Mohs scale and can be observed through a combination of its compressive …
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In hydraulic structures, abrasion resistance can be a significant driver in concrete specification. Basalt micro-fibres represent a potentially sustainable construction product and have been shown to provide various benefits in concrete, however the implications for hydrodynamic abrasion resistance are to date unclear. This paper is the …
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This paper looked into the compression strength of basalt fiber reinforced concrete when it bears expanded clay as aggregate and when it bears the usual gravel as aggregate. One thing to note is that the weight of both BFRC specimens vary as, the BFRC with expanded clay showed much lighter weight than that of BFRC with gravel. ...
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The use of basalt fibres to improve the hardened properties of concrete has increased in recent times. The incorporation of these fibres into concrete results in a change in the hardened state of concrete. However, these fibres also influence the corresponding fresh properties of concrete, specifically its workability. Therefore, it is critical to …
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Hardness and Strength of Basalt. The physical properties of Basalt depend on its formation. Physical properties of rocks play an important role in determining its applications in various fields. Rocks are rated on the on the Moh's Hardness Scale which rates the rocks on the scale from 1 to 10. Rocks with hardness 1-3 are soft rocks from 3-6 are ...
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To determine the compressive strength (CS) and tensile strength (TS) of basalt fiber reinforced concrete (BFRC), this study will develop empirical models using …
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To study the effects of basalt fibers (BFs), calcium sulfate whiskers (CSWs), and modified calcium sulfate whiskers (MCSWs) on the compressive strength and …
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Porosity is a significant physical feature of rocks due to water absorption that causes decrease in the strength. The basalt of the study area can be described as "highly porous" and ignimbrite as "extremely porous" according to the classification by Anon (1979).The average UCS of basalt is determined as 26.65 MPa.For the ignimbrite, the …
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Compressive test results showed basalt fiber could increase compressive strength at elevated temperatures. The optimal basalt fiber volume fraction was 0.8%, …
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strength values, ranging between 2 and 9 MPa, basalt powder/slag blend mixes exhibit a moderate compres-sive strength, i.e., 20 MPa at 28 days. Furthermore, sodium-silicate-activated basalt powder/slag blend mixes achieve high compressive strengths at early and further ages. The low strength values of the basalt
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The above research mainly uses test methods to explore the compressive strength of basalt, but the test methods are time-consuming and labor-intensive, and …
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The low tensile capacity of concrete often results in brittle failure without any warning. One way to cope with this issue is to add fibers and essentially improve the tensile strength (TS) behavior of concrete and offset its undesirable brittle failure. In recent investigations, basalt fibers (BFs), as compared to a variety of other kinds of fiber, have …
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Fibres are used in concrete to improve its structural integrity. Nowadays, among all basalt fibres, an inert mineral fibre is gaining more importance due to its exceptional properties, which include resistance to corrosion and low thermal conductivity. It also improves tensile strength, flexural strength and toughness of concrete. It can be …
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Basalt Fibers Dose vs. the Strength effectiveness (Data redrawn from (Algin and Ozen, 2018)). The effects of varying fibers lengths (3–25.4 mm) on the optimum dosage for splitting tensile strength are summarized in Table 4. The optimum BF content ranged between 0.1% and 0.5% for all the studies, expect one, while a maximum …
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According to the pervious study, the performance improvement with the addition of basalt in normal strength concrete or high strength concrete are similar with each other . This shows that the optimal dosage of basalt fiber is 2% with the addition of metakaolin, ranging from 1% to 3% for the compression strength, modulus of elasticity, …
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The compressive strength of the compressive strength of BF0.1PF0 is 0.35% lower than that of BF0PF0 without fiber. The compressive strength of BF0PF0025 is 5.22% lower than that of BF0PF0. A similar result has been reported for the compressive behavior of basalt fiber in high-strength concrete [2]. This similarity may be due to …
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Overall, axial compressive strength for Pacaya basalt ranges widely from 12 to 174 MPa (Table 3), with the lower end falling into strength categories as low as …
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The strength properties of basalt fiber–reinforced biocemented (BFRB) sand specimens with various calcite contents and fiber contents are investigated through a series of unconfined compressive and splitting tensile tests. Reverse injection is introduced to improve the uniformity of the calcium carbonate precipitation. The test results show ...
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