Abstract

This work aimed to investigate experimentally the effect of incorporating waste glass powder on the shear behaviour of reinforced concrete beams under bending load in terms of load- vertical displacement relation, load-strain relation, cracks pattern/propagation, load –cracks relation, and mode of failure. The replaced cement partially with waste glass powder achieves two main goals; the first is an economic benefit represented by reducing the cost of supplementary materials and the second one is an environmental benefit represented by solving some of the solid waste problems that waste causes and saving energy. The experimental program consists of testing nine simply supported beams of 150 × 150 × 900 mm designed to fail in shear. Three parameters have been studied; glass powder content (0, 10, and 15% as partial replacement of cement), steel reinforcement ratio equal to 0.02267 (2Φ16mm), and 0.013785 (2Φ12mm), and spacing between stirrups (65 and 170 mm). The test results showed that using glass powder improved the strength capacity of the beam and that can be seen through the increase in ultimate load for beams incorporating glass powder compared to the control beam. Recorded load at failure increased by 39% and 23% for 10% and 15% replacement compared with the control beam. For the same waste glass powder content, an increase in the amount of longitudinal steel reinforcement from 2Φ12 mm to 2Φ16 mm led to an increase in ultimate load but decreases in the corresponding vertical displacement, which refers to more brittle behaviour. In addition, reducing the spacing among the stirrups from 170 mm to 65 mm led to a decrease in ultimate load and increasing in the corresponding vertical displacement. The incorporation of waste glass powder made the behaviour of beams more brittle i.e. for the same load the vertical displacement for beams incorporating waste glass powder (especially for 15%) is lower than for reference beams without waste glass powder, which is not desired. To take advantage of the property of waste glass powder by improving the ultimate strength of the beam, which appeared by increasing the maximum load at failure compared to the reference beam and at the same time preventing the property of brittle failure caused by the addition of this material, it is suggested to use waste glass powder with fibers.

摘要

这项工作旨在通过实验研究掺入废玻璃粉对钢筋混凝土梁在弯曲荷载下的剪切行为的影响，包括荷载-垂直位移关系、荷载-应变关系、裂缝模式/扩展、荷载-裂缝关系和模式的失败。用废玻璃粉部分替代水泥达到两个主要目的；一是经济效益，以降低辅料成本为代表；二是环境效益，以解决部分废弃物造成的固体废弃物问题和节约能源为代表。实验计划包括测试 9 个 150 × 150 × 900 mm 的简支梁，这些梁设计为在剪切中失效。研究了三个参数；玻璃粉含量（0%、10%、15%，部分替代水泥），钢筋配筋率等于0.02267（2Φ16mm）和0.013785（2Φ12mm），箍筋间距（65和170mm）。测试结果表明，使用玻璃粉提高了梁的强度能力，这可以从与控制梁相比加入玻璃粉的梁的极限载荷增加中看出。与控制梁相比，更换 10% 和 15% 时记录的失效载荷增加了 39% 和 23%。对于相同的废玻璃粉含量，纵向钢筋的数量从 2Φ12 mm 增加到 2Φ16 mm 会导致极限载荷增加，但相应的垂直位移减小，这意味着更脆的行为。此外，将箍筋之间的间距从 170 毫米减少到 65 毫米导致极限荷载减少，相应的垂直位移增加。废玻璃粉的加入使梁的行为更脆，即对于相同的负载，包含废玻璃粉（尤其是 15%）的梁的垂直位移低于没有废玻璃粉的参考梁，这是不希望的。通过提高梁的极限强度来利用废玻璃粉的特性，与参考梁相比，通过增加最大破坏载荷而出现，同时防止由于添加这种材料而引起的脆性破坏的特性材料，建议使用含纤维的废玻璃粉。废玻璃粉的加入使梁的行为更脆，即对于相同的负载，包含废玻璃粉（尤其是 15%）的梁的垂直位移低于没有废玻璃粉的参考梁，这是不希望的。通过提高梁的极限强度来利用废玻璃粉的特性，与参考梁相比，通过增加最大破坏载荷而出现，同时防止由于添加这种材料而引起的脆性破坏的特性材料，建议使用含纤维的废玻璃粉。废玻璃粉的加入使梁的行为更脆，即对于相同的负载，包含废玻璃粉（尤其是 15%）的梁的垂直位移低于没有废玻璃粉的参考梁，这是不希望的。通过提高梁的极限强度来利用废玻璃粉的特性，与参考梁相比，通过增加最大破坏载荷而出现，同时防止由于添加这种材料而引起的脆性破坏的特性材料，建议使用含纤维的废玻璃粉。