摘要
为全面有效控制城市建筑施工扬尘排放,以海藻酸钠、氯化钙为材料,研制快速成膜型环境友好抑尘剂。采用正交实验确定适宜的配比及用量,并通过性能检测实验,对抑尘剂抑尘效果进行研究。结果显示,分别以4 L/m~2和2.5 L/m~2喷洒浓度为0.50%海藻酸钠和2.0%氯化钙溶液于裸露地面,表面可迅速成膜,覆盖并固结表层细颗粒,抑制扬尘并提高表层强度;成膜吸湿保水性良好,遇水不溶解、不迁移,耐风蚀性好,抑尘效率达99%以上。
In order to control the dust emissions from urban construction sites effectively,this study used sodium alginate as membrane-forming agent,calcium chloride as membrane-forming aid to develop instantly membrane-cover and environmentally friendly dust suppressor. The orthogonal experiment was applied to determine the appropriate ratio and the amount of each component,and a series of performance tests were applied to study the effect of dust suppressor.The results showed that sodium alginate solution and calcium chloride solution,the amount of which should be 4 L/m2 and2. 5 L/m2 and the mass fractions should be 0. 5% and 2. 0% respectively,were sprayed on the exposed ground,the surface formed a membrane rapidly,which can cover and compact the topsoil,then the dust emission can be controlled,and the surface strength can be improved. The hygroscopicity and water holding capacity of the membrane were good,the moisture content of the topsoil was above 11% and remained in a long period,the membrane was insoluble in water and cannot remove or transfer,it also had a good wind erosion resistance,if stimulating a five-grade wind to puff the membrane,the dust suppression rate reached to 99%.
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