Civil Engineering Department, Jouf University, Sakaka, KSA.
Civil Engineering Department, Delta University for Science and Technology, Dakahlia Governorate, Egypt.
PLoS One. 2024 Mar 29;19(3):e0298765. doi: 10.1371/journal.pone.0298765. eCollection 2024.
In this study, the variation of shear strength behavior and particle breakage (after shearing), as a function of moisture state and compaction level, is investigated for recycled concrete aggregate blended with recycled clay masonry. Recycled masonry was blended with concrete aggregate in percentages ranging from 0% to 30% by total weight. Tests include; basic engineering characteristics (particle size, modified compaction, hydraulic conductivity, and California Bearing Ratio, CBR) as well as unconsolidated undrained static triaxial testing. In triaxial tests, moisture levels ranged from 60% to 100% of optimum moisture content, but compaction levels ranged from 90% to 98% of maximum dry density. The hydraulic conductivity for blends is approximately 2x10-6 cm/s, which indicates a relatively low hydraulic conductivity. Results show a proportional linear relationship between the shear strength of blends and the level of compaction. Despite this, both apparent cohesion and shear strength exhibited reverse linear trends. As expected, more compaction effort resulted in more particle breakage. Strict control should be performed over the compaction process to achieve the required compaction level which resulting in pavement materials being stiffer.
在这项研究中，研究了再生混凝土骨料与再生粘土砌体混合后的剪切强度行为和颗粒破碎（剪切后）随水分状态和压实水平的变化。再生砌体按总重量的 0%至 30%的比例与混凝土骨料混合。测试包括基本工程特性（粒径、改良压实、水力传导率和加州承载比（CBR））以及未固结不排水静三轴测试。在三轴试验中，水分含量范围为最佳含水量的 60%至 100%，但压实水平范围为最大干密度的 90%至 98%。混合物的水力传导率约为 2x10-6 cm/s，表明水力传导率相对较低。结果表明，混合物的剪切强度与压实水平之间存在比例线性关系。尽管如此，表观凝聚力和剪切强度都表现出相反的线性趋势。正如预期的那样，更多的压实努力会导致更多的颗粒破碎。应严格控制压实过程，以达到所需的压实水平，从而使路面材料更加坚硬。
