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混凝土是最大宗的人造材料,应用范围不断扩大。近期内混凝土科学技术的发展方向,首先是高强与高强轻质。本文在回顾混凝土研究的历史后建议在混凝土孔级配方面来一个突破。由于不同大小的孔对混凝土强度与有关的物理力学性能有着不同的影响,改善孔级配将显著地提高强度等性能,如能满足下列条件,就可能达到高强轻质的目的; ∑e_i=最大 ∑e_ix_i=最小式中e_i为第i孔级的分孔隙率,x_i为i孔级的强度影响系数。 可用几种方法来改善孔级配,例如加入高效外加剂、限制膨胀、聚合物浸渍等。 在研究解决了高强混凝土的脆性问题和减小截面后结构物的稳定性问题之后,用超高强混凝土(强度大于1000公斤/厘米~2)与高强钢筋(强度大于20000公斤/厘米~2)制造的组合材料将为建筑科学技术开辟广阔的前途。
Concrete is the largest man-made material and its range of applications is continuously expanding. The development direction of concrete science and technology in the near future is, first of all, high strength and high strength and light weight. After reviewing the history of concrete research, this paper proposes a breakthrough in the grading of concrete holes. Because different sizes of holes have different effects on concrete strength and related physical and mechanical properties, improving hole grading will significantly improve strength and other properties. If the following conditions are met, it is possible to achieve high-strength and lightweight properties; ∑e_i=max. ∑e_ix_i=Minimum where e_i is the fractional porosity of the i-th hole level, and x_i is the strength factor of the i-hole level. Several methods can be used to improve pore grading, such as adding high-efficiency admixtures, limiting expansion, polymer impregnation, and the like. After researching to solve the brittleness problem of high-strength concrete and reducing the structural stability of the cross-section, it is made of ultra-high-strength concrete (strength greater than 1,000 kg/cm~2) and high-strength steel (strength greater than 20,000 kg/cm~2). The combination of materials will open up broad prospects for building science and technology.