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Abstract
An experimental study was performed to investigate the shear strength of concrete beams made with dune sand (DS) from the Gurbantunggut Desert in the Chinese province of Xinjiang. The test consisted of 3 series of beams which explored the shear properties of dune sand concrete (DSC) beams. The failure mode, crack pattern, load deflection, and stirrup strain were investigated. Meanwhile, the effect of shear span‐to‐depth ratio (a/d), stirrup ratio, and dune sand replacement ratio on the shear strength of DSC beams was discussed. The results showed that the dune sand replacement ratio had insignificant influence on the failure mode of beams, so it was feasible to use DS to fabricate beams in regions of Xinjiang in China. Furthermore, the measured shear strengths of the DSC beams were compared with the calculated values of current design codes, and the results indicated that the shear strength of DSC beams was not precisely predicted by current design codes. Therefore, a modified formula was proposed to calculate the shear strength of DSC beams.
Highlights
Introduction e province ofXinjiang is located in the northwest of China, and nearly a quarter of Xinjiang is covered with dune sand (DS) due to dry continental climatic conditions [1]. e region of Xinjiang is characterized by a lack of natural fine aggregate resources
E figure showed that a/d had significant influence on the failure mode of beams. e beam B1-1 failed in diagonal shear; B1-2, B1-3, and B1-4 failed in bending-shear; and B1-5 failed in bending
When the load was close to the ultimate strength, one crack led to sudden and catastrophic failure, and the failure was solely due to the diagonal tension crack that propagated between the load point and the support
Summary
Introduction e province ofXinjiang is located in the northwest of China, and nearly a quarter of Xinjiang is covered with DS due to dry continental climatic conditions [1]. e region of Xinjiang is characterized by a lack of natural fine aggregate resources. E region of Xinjiang is characterized by a lack of natural fine aggregate resources. This region hosts a multitude of construction activities that require many aggregates for the onebelt-one-road policy. E content and fineness of aggregates have significant influence on the mechanical properties of concrete (strength, workability, and shrinkage). Erefore, numerous studies on the various properties of DSC were carried out. Guettala and Mezghiche [5, 6] repeated the study by adding dune sand powder (DSP) as a part mass addition to Portland cement, and the results proved that DSP presented a partial pozzolanic reactivity. Belferrag et al [7] repeated the study by using waste metal fibers to improve the compressive strength of DSC and cement mortar
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