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\rSD-II<\/strong><\/span>电动砂当量试验仪<\/strong><\/span> <\/strong><\/span><\/span>\r<\/p>\r \r电动砂当量试验仪简介：<\/strong><\/span> <\/span>\r<\/p>\r \r 该仪器根据**行业标准（<\/strong><\/span>JTJ058-2000<\/strong><\/span>）中（<\/strong><\/span>T0334-1994<\/strong><\/span>）细集料砂当量试验规程要求设计的产品<\/strong><\/span>,<\/strong><\/span>适用于沥青混合料及水泥混凝土<\/strong><\/span>,<\/strong><\/span>用天然砂<\/strong><\/span>,<\/strong><\/span>人工砂<\/strong><\/span>,<\/strong><\/span>石屑<\/strong><\/span>,<\/strong><\/span>其集料最大粒径不超过<\/strong><\/span>4.75mm,<\/strong><\/span>测定细集料中所含的粘性土或杂质的含量<\/strong><\/span>,<\/strong><\/span>以评定集料的洁净程度<\/strong><\/span>,<\/strong><\/span>砂当量用<\/strong><\/span>SE<\/strong><\/span>表示。<\/strong><\/span>\r<\/p>\r \r <\/strong><\/span>\r<\/p>\r \r电动砂当量试验仪操作规程：<\/strong><\/span> <\/span>\r<\/p>\r \r ●为不影响沉淀的过程，试验必须在无抖动的水平台上进行。随时检查试验的冲洗管口，防止堵塞。试验过程中，冲洗液的温度应保持<\/strong><\/span>20<\/strong><\/span>±<\/strong><\/span>2<\/strong><\/span>℃范围内。<\/strong><\/span> <\/span>\r<\/p>\r \r ●用冲洗管将冲洗液吸入试筒，将干料倒入竖立的试筒中静至<\/strong><\/span>10min<\/strong><\/span>，用橡胶塞堵住试筒，将试筒水平固定在振荡器上。<\/strong><\/span> <\/span>\r<\/p>\r \r ●打开电动砂当量试验仪“总电源”开关，将仪器“振荡时间设置”调节至<\/strong><\/span>30<\/strong><\/span>秒，按下“启动”键，电动砂当量试验仪震荡<\/strong><\/span>30<\/strong><\/span>秒自动停止。然后旋转“启动”键振荡器还原，取下试筒。<\/strong><\/span> <\/span>\r<\/p>\r \r ●将插管插入试筒中灌冲洗液直到<\/strong><\/span>380mm<\/strong><\/span>刻度线为止，静至<\/strong><\/span>20min<\/strong><\/span>。<\/strong><\/span> <\/span>\r<\/p>\r \r ●测量：用钢板尺在试筒外量测从试筒底部到絮凝物上液面的高度准确至<\/strong><\/span>1mm<\/strong><\/span>，即<\/strong><\/span>h1<\/strong><\/span>。将配重活塞套筒在试筒口放好，直到碰到沉淀物时立即拧紧固定螺丝，将尺子插入套筒的开口处，是零点对准活塞的底面。从套筒处读取沉淀物的高度，准确至<\/strong><\/span>1mm<\/strong><\/span>即<\/strong><\/span>h2<\/strong><\/span>。上述测量过程应在<\/strong><\/span>30<\/strong><\/span>秒内完成。<\/strong><\/span> <\/span>\r<\/p>\r \r <\/strong><\/span>\r<\/p>\r \r电动砂当量试验仪试验设备：<\/strong><\/span> <\/span>\r<\/p>\r \r ●橡胶管（或塑料管）：长约<\/strong><\/span>1.5mm<\/strong><\/span>，内径约<\/strong><\/span>5mm<\/strong><\/span>，与冲洗管、虹吸弯管联在一起吸液用，本有金属夹，以控制冲洗液流量。<\/strong><\/span> <\/span>\r<\/p>\r \r ●配重活塞同杆、底座、套筒、配重组成。杆长<\/strong><\/span>430<\/strong><\/span>±<\/strong><\/span>0.25mm<\/strong><\/span>；底座直径<\/strong><\/span>25<\/strong><\/span>±<\/strong><\/span>0.1mm<\/strong><\/span>，底面平坦光滑，垂直杆轴，横向有三个螺丝可保持活塞在试筒中间有一点小缝隙。套筒有一个螺丝，能固定活塞下沉的位置，并有一个能靠尺子的深<\/strong><\/span>1cm<\/strong><\/span>、宽<\/strong><\/span>5mm<\/strong><\/span>的缺口，用于测量读数。固定在活塞杆顶端的配重，除筒套外总重<\/strong><\/span>1kg<\/strong><\/span>±<\/strong><\/span>5g<\/strong><\/span>。<\/strong><\/span> <\/span>\r<\/p>\r \r ●振荡器：使试筒产生横向直线运动。振幅：<\/strong><\/span>20.3<\/strong><\/span>±<\/strong><\/span>1.0cm,<\/strong><\/span>运动周期<\/strong><\/span>180<\/strong><\/span>±<\/strong><\/span>2<\/strong><\/span>次<\/strong><\/span>/min<\/strong><\/span>。<\/strong><\/span> <\/span>\r<\/p>\r \r ●圆柱形试筒：透明塑料制内径<\/strong><\/span>32<\/strong><\/span>±<\/strong><\/span>0.025mm<\/strong><\/span>，高度<\/strong><\/span>420<\/strong><\/span>±<\/strong><\/span>0.25mm<\/strong><\/span>。人试筒底部起到<\/strong><\/span>100<\/strong><\/span>±<\/strong><\/span>0.25mm<\/strong><\/span>、<\/strong><\/span>380<\/strong><\/span>±<\/strong><\/span>0.25mm<\/strong><\/span>处刻划标记线，配有橡胶塞。<\/strong><\/span> <\/span>\r<\/p>\r