Han Yongguang, Zhou Tianhua
Architectural Engineering College of Chongqing City Vocational College, Chongqing 400044, China.
School of Civil Engineering, Chang'an University, Xi'an 710054, China.
Materials (Basel). 2023 Aug 21;16(16):5711. doi: 10.3390/ma16165711.
This paper develops the mechanical and durable samples of C50 high-performance concrete, studies the mechanical properties, crack resistance, sulfate attack resistance, frost resistance, and impermeability of concrete with different mineral admixtures of mineral powder and fly ash, and obtains the best mineral admixture of mineral powder and fly ash to improve the performance of high-performance concrete. The results show that the doping effect is the best when the ratio of prepared mineral powder to fly ash is 3:2. With the increase in the mineral powder-fly ash admixture, the slump and expansion of high-performance concrete decrease rapidly at first and then slowly. In total, 60% doping is the turning point; the compressive and flexural strengths of concrete decreased slowly at first and then rapidly. Taking 30% of the admixture as the turning point, 35% of the mineral powder fly ash is generally selected. By mixing and adding a certain proportion of fly ash and mineral powder admixtures, the crack resistance of concrete is enhanced, and the shrinkage and cracking are reduced. The corrosion resistance coefficient will exceed 88%, the relative dynamic elastic modulus will exceed 95%, and the impermeability grade will reach P17. The durability of concrete can be improved by adding mineral admixtures.
本文研制了C50高性能混凝土的力学性能和耐久性试件，研究了掺加不同矿物掺合料（矿粉和粉煤灰）的混凝土的力学性能、抗裂性、抗硫酸盐侵蚀性、抗冻性和抗渗性，得出了提高高性能混凝土性能的最佳矿粉和粉煤灰矿物掺合料。结果表明，当制备的矿粉与粉煤灰比例为3:2时，掺杂效果最佳。随着矿粉-粉煤灰掺合料的增加，高性能混凝土的坍落度和扩展度起初迅速下降，随后缓慢下降。总体而言，60%的掺杂量是转折点；混凝土的抗压强度和抗折强度起初缓慢下降，随后迅速下降。以30%的掺合料为转折点，一般选用35%的矿粉粉煤灰。通过掺加一定比例的粉煤灰和矿粉掺合料，增强了混凝土的抗裂性，减少了收缩和开裂。抗腐蚀系数将超过88%，相对动弹模量将超过95%，抗渗等级将达到P17。添加矿物掺合料可提高混凝土的耐久性。
