早高强砂浆和混凝土的力学性能及抗爆实验

Mechanical performance and blast-resistant test of early high-strength mortar and concrete

随着大型工程结构的飞速发展,高强混凝土是现代混凝土的一个重要发展方向。采用铝酸盐水泥、硅酸盐水泥和石膏作为胶凝材料配制了快硬、早高强微膨胀砂浆和混凝土。早高强砂浆的1、3、7 d抗压强度和抗折强度分别为37、59、72M Pa和8.4、11.3、13.2M Pa。早高强混凝土的1、3、7 d抗压强度和抗折强度分别为27、65、70M Pa和2.5、6.8、9.9M Pa。利用一种预置爆室的抗爆实验方式,对所配制的早高强混凝土和普通混凝土的抗爆性能进行对比研究。实验结果表明:早高强混凝土制作的爆室,在20 g TNT药量作用下,爆室结构保持完好,实现密封要求;而相同条件下,普通混凝土制作的爆室结构被严重破坏。

With the rapid development of engineering construction, high-strength concrete is an important way of modern concrete. The concrete which was hardened quickly and strengthened early was prepared with mixing of aluminate cement, Portland cement and gypsum. The compressive strength and folding strength of the high-strength mortar reach 72 MPa and 13.2 MPa after seven days respectively, while the compressive strength and folding strength of the high-strength concrete arrive at 70 MPa and 9.9 MPa after seven days respectively. The blast-resistant properties of the early high-strength concrete and the common concrete were tested and compared with an initialization explode chamber. When 20 g TNT exploded in the closed chamber, the form of the chamber was investigated. The results show that the chamber constructed with the early high-strength concrete keeps its form and achieves hermetization, but the chamber constructed with the common concrete is damaged badly. Therefore, the early high-strength concrete can be employed in order to obtain the excellent blast-resistant property.