再生骨料高强混凝土材料的制备及性能研究
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摘要
以精细再生骨料置换精细天然骨料为原料制备混凝土,设计制备精细再生骨料与精细天然骨料不同的置换比、水/水泥(W/C)不同混合比的混凝土标本,并评价其可加工性、密度、抗压强度及导电率等性能。结果表明,水/水泥比率、精细再生骨料对精细天然骨料的置换量率对混凝土标本的加工性没有影响,均可满足混泥土塌落度的要求;而在水/水泥比率为W/C=0.35,精细再生骨料与精细天然骨料的置换比为50%时,A50混凝土标本的密度较高,抗压强度达到61.34 MPa,电阻率达到14.08 kΩ·cm,满足高强度混凝土强度标准。由此可知,精细再生骨料置换比的最佳比例为50%左右,此比例不会影响混凝土标本的物理、机械性能和耐久性,制得的混凝土性能最优。
The concrete was prepared by replacing the fine natural aggregate with fine recycled aggregate as raw material. The concrete specimens with different substitution ratio and different water/cement(W/C) mixing ratio were prepared and evaluated, and the processability, density, compressive strength and electrical conductivity were evaluated. The results showed that the ratio of water/cement ratio and fine recycled aggregate to fine natural aggregate had no effect on the processability of concrete specimens, and could both meet the requirements of concrete slump. But when water/cement ratio of W/C was 0.35 and the best replacement ratio of fine recycled aggregate and natural aggregate was 50%, the density of A50 concrete specimens was higher, the compressive strength was as high as 61.34 MPa, and the resistivity was 14.08 kΩ·cm, which could meet the strength standard of high strength concrete. Based on the above analysis, the fine recycled aggregate replacement ratio was about 50%, which did not affect the physical, mechanical properties and durability of the concrete specimen, and the quality of the obtained concrete was improved.
The concrete was prepared by replacing the fine natural aggregate with fine recycled aggregate as raw material. The concrete specimens with different substitution ratio and different water/cement(W/C) mixing ratio were prepared and evaluated, and the processability, density, compressive strength and electrical conductivity were evaluated. The results showed that the ratio of water/cement ratio and fine recycled aggregate to fine natural aggregate had no effect on the processability of concrete specimens, and could both meet the requirements of concrete slump. But when water/cement ratio of W/C was 0.35 and the best replacement ratio of fine recycled aggregate and natural aggregate was 50%, the density of A50 concrete specimens was higher, the compressive strength was as high as 61.34 MPa, and the resistivity was 14.08 kΩ·cm, which could meet the strength standard of high strength concrete. Based on the above analysis, the fine recycled aggregate replacement ratio was about 50%, which did not affect the physical, mechanical properties and durability of the concrete specimen, and the quality of the obtained concrete was improved.
引文
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[14] Koper A,Koper W,Koper M.Influence of raw concrete material quality on selected properties of recycled concrete aggregates [J].Procedia Engineering,2017,172:536-543.
[15] Evangelista L,Brito J D.Mechanical behaviour of concrete made with fine recycled concrete aggregates[J].Cement and Concrete Composites,2007,29(5):397-401.
[2] Du Ting,Li Huiqiang,Wu Xiangguo,et al.The compression-deformation behaviour of concrete with various modified recycled aggregates [J].Journal of Wuhan University of Technology (Materials Science Edition),2005,20(2):127-129.
[3] Soares D,Brito J de,Ferreira J,et al.Use of coarse recycled aggregates from precast concrete rejects:mechanical and durability performance[J].Construction and Building Materials,2014,71:263-272.
[4] Thomas C,Sosa I,Setién J,et al.Evaluation of the fatigue behavior of recycled aggregate concrete[J].Journal of Cleaner Production,2014,65:397-405.
[5] Miled K,Limam O,Sab K.A probabilistic mechanical model for prediction of aggregates’ size distribution effect on concrete compressive strength[J].Physica A Statistical Mechanics & Its Applications,2012,391(12):3366-3378.
[6] Mefteh H,Kebali O,Oucief H,et al.Influence of moisture conditioning of recycled aggregates on the properties of fresh and hardened concrete[J].Journal of Cleaner Production,2013,54(Complete):282-288.
[7] Khatib J M.Properties of concrete incorporating fine recycled aggregate[J].Cement and Concrete Research,2005,35(4):763-769.
[8] Abdel-Hay A S.Properties of recycled concrete aggregate under different curing conditions[J].HBRC Journal,2017,13(3):271-276.
[9] Evangelista L,Brito J D.Flexural behaviour of reinforced concrete beams made with fine recycled concrete aggregates[J].KSCE Journal of Civil Engineering,2017,21(1):353-363.
[10] Khoshkenari A G,Shafigh P,Moghimi M,et al.The role of 0-2 mm fine recycled concrete aggregate on the compressive and splitting tensile strengths of recycled concrete aggregate concrete[J].Materials & Design,2014,64:345-354.
[11] Liu Q,Zhang X N.Expermental study on the mixture ratio and the compressive strength of concrete with recycle crushed brick coarse aggregate[J].Applied Mechanics and Materials,2014,584-586:1362-1365.
[12] Mardaniaghabaglou A,Tuyan M,Ramyar K.Mechanical and durability performance of concrete incorporating fine recycled concrete and glass aggregates[J].Materials & Structures,2015,48(8):2629-2640.
[13] Li W,Li Y,Zhang H Y.Development of performance optimization of recycled aggregate[J].Advanced Materials Research,2013,811:254-257.
[14] Koper A,Koper W,Koper M.Influence of raw concrete material quality on selected properties of recycled concrete aggregates [J].Procedia Engineering,2017,172:536-543.
[15] Evangelista L,Brito J D.Mechanical behaviour of concrete made with fine recycled concrete aggregates[J].Cement and Concrete Composites,2007,29(5):397-401.