玻璃纤维水泥土集雨面物理性能的试验研究

Experimental study on physical properties of water harvesting surface made of glass fiber reinforced mixture of soil and portland cement

为了提高集雨—灌溉农业中雨水收集的效益 ,开发经济、适用的材料用于建造集雨面非常重要。为确定新开发的一种集雨面材料—玻璃纤维水泥土在恶劣环境下 (如冻融、干湿变化 )其强度和抗渗透性的变化 ,在实验室内进行了控制条件下的性能试验研究。用玻璃纤维水泥土制成的集雨面立方体试块 ,研究了集雨面在干湿循环、冻融循环物理作用下的强度、抗渗性能和体积冻胀变形特性。定量确定了玻璃纤维水泥土的性能变化规律。结果表明 ,玻璃纤维水泥土集雨面的抗压强度在浸水饱和后比初始抗压强度降低 2 6% ,而在冻结融化和干燥后恢复并比初始抗压强度增加 41% ,且随干湿循环和冻融烘干循环次数增加略有提高 ;体积随干湿或冻融的膨胀或收缩变化较小 ;表面的渗透性较低。

In order to increase the efficiency of water harvesting to develop appropriate materials for water harvesting surfaces is important. In order to determine the strength and permeability of the water harvesting surface made of the new material developed, a series of laboratory experiments were conducted. Cubes of the water harvesting surface made of fiber-glass reinforced mixture of soil and cement were subjected to drying-wetting circles and freezing-thawing circles to determine the dynamical changes of the strength and the permeability of the surface as well as the volumetric swelling and shrinking of the cubes. The changes of the physical properties of the cubes were quantitatively determined. Experimental result showed that saturated surface material had less strength about 26% of that of primary one, which was recovered at the next drying circle. The reduced strength of the surface was recovered to 41% of the primary strength after freezing, thawing and drying, and was enhanced as freezing, thawing drying circle times increasing. Lower swelling rate while wetting and freezing and lower shrinking while drying and thawing were found. Permeability was found to be lower. The material is proved to be good for water harvesting surface.