砂岩机制砂C50箱梁混凝土配制及耐久性能研究

根据广西梧柳高速公路工程C50箱梁混凝土的设计要求,结合当地环境的腐蚀特点,开展了砂岩机制砂与天然河砂配制C50箱梁混凝土的配制技术研究。对比分析其在力学性能、抗裂性能、耐久性能及体积稳定性能方面的影响规律。研究结果表明,砂岩机制砂配制的C50箱梁混凝土工作性能与河砂混凝土相当,在力学性能、抗压强度、轴心抗压强度及弹性模量方面均体现出优于河砂混凝土的性能特征。在选择适当的胶凝材料用量及掺合料掺量时,可配制出耐久性与体积稳定性比河砂混凝土更优的砂岩机制砂C50箱梁混凝土。

Preparation and durability performance of C50 box girder concrete with sandstone-mechanism sand

This paper researches the preparation technology of C50 box girder concrete with mechanism sand and natural river sand,according to the engineering design requirements of C50 box girder concrete of Guangxi Wuliu highway engineering,and combining with the corrosion characteristics of the local environment.Comparing and analyzing the mechanical properties,crack resistance,durability performance and volume stability of the two kinds of concretes,we draw the conclusion that the working performance of C50 sandstone-mechanism sand box girders concrete is similar to that of the concrete with natural river sand;the physical performance of the former such as compressive strength,axial compressive strength and elastic modulus are better than that of river sand concrete.Selecting appropriate dosage of the gelled material and the admixture,we can proportion the C50 sandstone-mechanism sand box girder concrete which has better durability performance and volume stability than the river sand concrete.