Akbulut Zehra Funda, Yavuz Demet, Tawfik Taher A, Smarzewski Piotr, Guler Soner
Department of Mining Engineering, Faculty of Engineering, University of Van Yüzüncü Yıl, Van 65080, Turkey.
Department of Civil Engineering, Faculty of Engineering, University of Van Yüzüncü Yıl, Van 65080, Turkey.
Materials (Basel). 2024 Jul 15;17(14):3504. doi: 10.3390/ma17143504.
This study compares the workability, mechanical, and thermal characteristics of structural self-compacting lightweight concrete (SCLWC) formulations using pumice aggregate (PA), expanded perlite aggregate (EPA), fly ash (FA), and silica fume (SF). FA and SF were used as partial substitutes for cement at a 10% ratio in various mixes, impacting different aspects: According to the obtained results, FA enhanced the workability but SF reduced it, while SF improved the compressive and splitting tensile strengths more than FA. EPA, used as a fine aggregate alongside PA, decreased the workability, compressive strength, and splitting tensile strength compared to the control mix (K0). The thermal properties were altered by FA and SF similarly, while EPA notably reduced the thermal conductivity coefficients. The thermal conductivity coefficients (TCCs) of the K0-K4 SCLWC mixtures ranged from 0.275 to 0.364 W/mK. K0 had a TCC of 0.364 W/mK. With 10% FA, K1 achieved 0.305 W/mK; K2 with 10% SF reached 0.325 W/mK. K3 and K4, using EPA instead of PA, showed significantly lower TCC values: 0.275 W/mK and 0.289 W/mK, respectively. FA and SF improved the thermal conductivity compared to K0, while EPA further reduced the TCC values in K3 and K4 compared to K1 and K2. The compressive strength (CS) values of the K0-K4 SCLWC mixtures at 7 and 28 days reveal notable trends. Using 10% FA in K1 decreased the CS at both 7 days (12.16 MPa) and 28 days (22.36 MPa), attributed to FA's gradual pozzolanic activity. Conversely, K2 with SF showed increased CS at 7 days (17.88 MPa) and 28 days (29.89 MPa) due to SF's rapid pozzolanic activity. Incorporating EPA into K3 and K4 reduced the CS values compared to PA, indicating EPA's lower strength contribution due to its porous structure.
本研究比较了使用浮石骨料（PA）、膨胀珍珠岩骨料（EPA）、粉煤灰（FA）和硅灰（SF）的结构自密实轻质混凝土（SCLWC）配方的工作性、力学性能和热性能。在各种混合料中，FA和SF以10%的比例用作水泥的部分替代品，影响不同方面：根据所得结果，FA提高了工作性，但SF降低了工作性，而SF比FA更能提高抗压强度和劈裂抗拉强度。与PA一起用作细骨料的EPA，与对照混合料（K0）相比，降低了工作性、抗压强度和劈裂抗拉强度。FA和SF对热性能的改变类似，而EPA显著降低了热导率系数。K0 - K4 SCLWC混合物的热导率系数（TCCs）范围为0.275至0.364W/mK。K0的TCC为0.364W/mK。含10%FA的K1达到0.305W/mK；含10%SF的K2达到0.325W/mK。使用EPA代替PA的K3和K4显示出明显更低的TCC值：分别为0.275W/mK和0.289W/mK。与K0相比，FA和SF提高了热导率，而与K1和K2相比，EPA进一步降低了K3和K4中的TCC值。K0 - K4 SCLWC混合物在7天和28天的抗压强度（CS）值显示出显著趋势。在K1中使用10%FA降低了7天（12.16MPa）和28天（22.36MPa）的CS，这归因于FA的逐渐火山灰活性。相反，含SF的K2在7天（17.88MPa）和28天（29.89MPa）显示出CS增加，这是由于SF的快速火山灰活性。与PA相比，在K3和K4中加入EPA降低了CS值，表明由于其多孔结构，EPA的强度贡献较低。
