微波快速干燥法在混凝土水胶比控制中的应用研究

Study on the Application of Rapid Drying Method Using Microwave in the Control of Water-Cement Ratio of Concrete

摘要: 水胶比是影响混凝土强度最主要的因素，骨料的含水率与混凝土用水量的快速测定是控制其水胶比的关键技术。本文采用微波炉作为干燥设备，研究了试样数量、微波炉功率和干燥时间等参数对骨料含水率和混凝土用水量试验结果的影响。试验结果表明，骨料含水率和混凝土用水量试验分别仅需要10 min和30 min。微波法速度快、精度高、操作简单。该方法用于在日常生产中测定砂石骨料含水率和混凝土用水量是可行的，能及时调整混凝土用水量以准确地控制混凝土水胶比。

Abstract: Water-cement ratio is the most important factor affecting the strength of concrete. Rapid determination of moisture content of aggregate and water consumption is the key technology to control the water-cement ratio. In this paper, microwave oven is used as drying equipment to study the influence of sample quantity, microwave oven power and drying time on the test results of moisture content of aggregate and concrete water consumption. The test results show that it only takes 10 min and 30 min for testing the moisture content of aggregate and concrete water consumption respectively. The microwave method is fast, accurate and easy to operate. It is feasible to use this method to determine the moisture content of sand and gravel aggregate and the water consumption of concrete in daily production, so that the water consumption and the water-cement ratio of concrete can be accurately controlled in time.