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Mechanical and thermal properties of recycled coarse aggregate concrete incorporating microencapsulated phase change materials and recycled tire rubber granules and its freeze-thaw resistance
Journal of Building Engineering ( IF 6.7 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.jobe.2025.111821
Desheng Li, Binxiang Sun, Lijun Yang, Wei Wang
Journal of Building Engineering ( IF 6.7 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.jobe.2025.111821
Desheng Li, Binxiang Sun, Lijun Yang, Wei Wang
For the recycling and reuse of construction waste and scrap tires based on the strategy of limiting carbon emissions in response to warming, a study was performed on the performance of recycled coarse aggregate concrete (RCAC) by replacing natural sand with different volume contents of recycled tire rubber granules (RTRGs) and microencapsulated phase change materials (mPCMs). The results show that the mechanical strength and dynamic elastic modulus of RCAC specimens reduce slowly with increasing RTRGs or mPCMs. All other mechanical strengths significantly reduce compared to the reference RCAC specimens without admixture, while the splitting tensile strengths of RCAC specimens with 4–6% RTRG and 4–8% mPCM contents show an increase of 0.12–0.34 MPa. The thermal conductivities of RCAC specimens with different RTRG and mPCM contents at −0.2 or −5 °C ambient temperature decrease significantly compared to those at 20 °C, and these decreasing values all decrease with increasing RTRGs and mPCMs. The CT scanning results show that incorporating RTRGs with a larger grain size of 0.30–1.18 mm tends to affect the larger 3D pore structures in RCACs, whereas incorporating mPCMs with a grain size of 5–10 μm tends to affect the smaller pores because the microcapsules easily fill the capillary pores with pore sizes <10 μm. With increasing freeze-thaw cycles, the relative dynamic elastic modulus and damage of RCAC specimens decrease slowly in the early stages of 1–50 cycles and rapidly after 50 cycles. After 175 cycles, Specimen No. R-4-6 with 4 % RTRGs and 6 % mPCMs has the lowest damage value of 0.61, which is 0.13 lower than Specimen No. R-4-8. Therefore, the simultaneous use of RTRGs and mPCMs with appropriate contents can improve the freeze-thaw durability of RCAC.
中文翻译:
结合微胶囊相变材料和再生轮胎橡胶颗粒的再生粗骨料混凝土的力学和热性能及其抗冻融性能
针对建筑垃圾和废旧轮胎的回收再利用,基于应对变暖限制碳排放的策略,通过用不同体积含量的再生轮胎橡胶颗粒 (RTRG) 和微胶囊相变材料 (mPCM) 代替天然砂,对再生粗骨料混凝土 (RCAC) 的性能进行了研究。结果表明:RCAC试件的机械强度和动弹性模量随着RTRGs或mPCMs的增加而缓慢降低。与未掺合物的参考 RCAC 试样相比,所有其他机械强度均显著降低,而 RTRG 为 4-6% 和 mPCM 含量为 4-8% 的 RCAC 试样的分裂拉伸强度显示增加 0.12-0.34 MPa。与 20 °C 相比,在 −0.2 °C 或 −5 °C 环境温度下,不同 RTRG 和 mPCM 含量的 RCAC 样品的热导率显著降低,且这些降低值均随着 RTRGs 和 mPCMs 的增加而降低。CT 扫描结果表明,掺入晶粒尺寸为 0.30-1.18 mm 的 RTRG 往往会影响 RCAC 中较大的 3D 孔结构,而掺入晶粒尺寸为 5-10 μm 的 mPCM 往往会影响较小的孔隙,因为微胶囊很容易用孔径 <10 μm 填充毛细孔。随着冻融循环次数的增加,RCAC 试件的相对动弹性模量和损伤在 1–50 次循环的早期缓慢下降,在 50 次循环后迅速下降。175 次循环后,试样编号含有 4 % RTRG 和 6 % mPCM 的 R-4-6 损伤值最低,为 0.61,比样品编号 R-4-8 低 0.13。因此,同时使用含量适宜的 RTRGs 和 mPCMs 可以提高 RCAC 的冻融耐久性。
更新日期:2025-01-23
中文翻译:
结合微胶囊相变材料和再生轮胎橡胶颗粒的再生粗骨料混凝土的力学和热性能及其抗冻融性能
针对建筑垃圾和废旧轮胎的回收再利用,基于应对变暖限制碳排放的策略,通过用不同体积含量的再生轮胎橡胶颗粒 (RTRG) 和微胶囊相变材料 (mPCM) 代替天然砂,对再生粗骨料混凝土 (RCAC) 的性能进行了研究。结果表明:RCAC试件的机械强度和动弹性模量随着RTRGs或mPCMs的增加而缓慢降低。与未掺合物的参考 RCAC 试样相比,所有其他机械强度均显著降低,而 RTRG 为 4-6% 和 mPCM 含量为 4-8% 的 RCAC 试样的分裂拉伸强度显示增加 0.12-0.34 MPa。与 20 °C 相比,在 −0.2 °C 或 −5 °C 环境温度下,不同 RTRG 和 mPCM 含量的 RCAC 样品的热导率显著降低,且这些降低值均随着 RTRGs 和 mPCMs 的增加而降低。CT 扫描结果表明,掺入晶粒尺寸为 0.30-1.18 mm 的 RTRG 往往会影响 RCAC 中较大的 3D 孔结构,而掺入晶粒尺寸为 5-10 μm 的 mPCM 往往会影响较小的孔隙,因为微胶囊很容易用孔径 <10 μm 填充毛细孔。随着冻融循环次数的增加,RCAC 试件的相对动弹性模量和损伤在 1–50 次循环的早期缓慢下降,在 50 次循环后迅速下降。175 次循环后,试样编号含有 4 % RTRG 和 6 % mPCM 的 R-4-6 损伤值最低,为 0.61,比样品编号 R-4-8 低 0.13。因此,同时使用含量适宜的 RTRGs 和 mPCMs 可以提高 RCAC 的冻融耐久性。