\rSD-II<\/strong><\/span>電動砂當量試驗儀<\/strong><\/span> <\/strong><\/span><\/span>\r<\/p>\r\r電動砂當量試驗儀簡介：<\/strong><\/span> <\/span>\r<\/p>\r\r 該儀器根據(jù)**行業(yè)標準（<\/strong><\/span>JTJ058-2000<\/strong><\/span>）中（<\/strong><\/span>T0334-1994<\/strong><\/span>）細集料砂當量試驗規(guī)程要求設計的產(chǎn)品<\/strong><\/span>,<\/strong><\/span>適用于瀝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>其集料最大粒徑不超過<\/strong><\/span>4.75mm,<\/strong><\/span>測定細集料中所含的粘性土或雜質(zhì)的含量<\/strong><\/span>,<\/strong><\/span>以評定集料的潔凈程度<\/strong><\/span>,<\/strong><\/span>砂當量用<\/strong><\/span>SE<\/strong><\/span>表示。<\/strong><\/span>\r<\/p>\r\r <\/strong><\/span>\r<\/p>\r\r電動砂當量試驗儀操作規(guī)程：<\/strong><\/span> <\/span>\r<\/p>\r\r ●為不影響沉淀的過程，試驗必須在無抖動的水平臺上進行。隨時檢查試驗的沖洗管口，防止堵塞。試驗過程中，沖洗液的溫度應保持<\/strong><\/span>20<\/strong><\/span>±<\/strong><\/span>2<\/strong><\/span>℃范圍內(nèi)。<\/strong><\/span> <\/span>\r<\/p>\r\r ●用沖洗管將沖洗液吸入試筒，將干料倒入豎立的試筒中靜至<\/strong><\/span>10min<\/strong><\/span>，用橡膠塞堵住試筒，將試筒水平固定在振蕩器上。<\/strong><\/span> <\/span>\r<\/p>\r\r ●打開電動砂當量試驗儀“總電源”開關，將儀器“振蕩時間設置”調(diào)節(jié)至<\/strong><\/span>30<\/strong><\/span>秒，按下“啟動”鍵，電動砂當量試驗儀震蕩<\/strong><\/span>30<\/strong><\/span>秒自動停止。然后旋轉(zhuǎn)“啟動”鍵振蕩器還原，取下試筒。<\/strong><\/span> <\/span>\r<\/p>\r\r ●將插管插入試筒中灌沖洗液直到<\/strong><\/span>380mm<\/strong><\/span>刻度線為止，靜至<\/strong><\/span>20min<\/strong><\/span>。<\/strong><\/span> <\/span>\r<\/p>\r\r ●測量：用鋼板尺在試筒外量測從試筒底部到絮凝物上液面的高度準確至<\/strong><\/span>1mm<\/strong><\/span>，即<\/strong><\/span>h1<\/strong><\/span>。將配重活塞套筒在試筒口放好，直到碰到沉淀物時立即擰緊固定螺絲，將尺子插入套筒的開口處，是零點對準活塞的底面。從套筒處讀取沉淀物的高度，準確至<\/strong><\/span>1mm<\/strong><\/span>即<\/strong><\/span>h2<\/strong><\/span>。上述測量過程應在<\/strong><\/span>30<\/strong><\/span>秒內(nèi)完成。<\/strong><\/span> <\/span>\r<\/p>\r\r <\/strong><\/span>\r<\/p>\r\r電動砂當量試驗儀試驗設備：<\/strong><\/span> <\/span>\r<\/p>\r\r ●橡膠管（或塑料管）：長約<\/strong><\/span>1.5mm<\/strong><\/span>，內(nèi)徑約<\/strong><\/span>5mm<\/strong><\/span>，與沖洗管、虹吸彎管聯(lián)在一起吸液用，本有金屬夾，以控制沖洗液流量。<\/strong><\/span> <\/span>\r<\/p>\r\r ●配重活塞同桿、底座、套筒、配重組成。桿長<\/strong><\/span>430<\/strong><\/span>±<\/strong><\/span>0.25mm<\/strong><\/span>；底座直徑<\/strong><\/span>25<\/strong><\/span>±<\/strong><\/span>0.1mm<\/strong><\/span>，底面平坦光滑，垂直桿軸，橫向有三個螺絲可保持活塞在試筒中間有一點小縫隙。套筒有一個螺絲，能固定活塞下沉的位置，并有一個能靠尺子的深<\/strong><\/span>1cm<\/strong><\/span>、寬<\/strong><\/span>5mm<\/strong><\/span>的缺口，用于測量讀數(shù)。固定在活塞桿頂端的配重，除筒套外總重<\/strong><\/span>1kg<\/strong><\/span>±<\/strong><\/span>5g<\/strong><\/span>。<\/strong><\/span> <\/span>\r<\/p>\r\r ●振蕩器：使試筒產(chǎn)生橫向直線運動。振幅：<\/strong><\/span>20.3<\/strong><\/span>±<\/strong><\/span>1.0cm,<\/strong><\/span>運動周期<\/strong><\/span>180<\/strong><\/span>±<\/strong><\/span>2<\/strong><\/span>次<\/strong><\/span>/min<\/strong><\/span>。<\/strong><\/span> <\/span>\r<\/p>\r\r ●圓柱形試筒：透明塑料制內(nèi)徑<\/strong><\/span>32<\/strong><\/span>±<\/strong><\/span>0.025mm<\/strong><\/span>，高度<\/strong><\/span>420<\/strong><\/span>±<\/strong><\/span>0.25mm<\/strong><\/span>。人試筒底部起到<\/strong><\/span>100<\/strong><\/span>±<\/strong><\/span>0.25mm<\/strong><\/span>、<\/strong><\/span>380<\/strong><\/span>±<\/strong><\/span>0.25mm<\/strong><\/span>處刻劃標記線，配有橡膠塞。<\/strong><\/span> <\/span>\r<\/p>\r\r
