mso-hansi-font-family:"Times New Roman"">一、概述：

SD-1手动砂当量试验仪是严格按照JTJ058-2000公路规程设计的产品。在使用本仪器前务必请按如下内容检查是否包装完好、项目齐全。如有欠缺，为维护您的权益请立即告知我们，本厂会及时为您提供服务。

mso-hansi-font-family:"Times New Roman"">二、手动砂当量试验仪产品技术参数：

mso-hansi-font-family:"Times New Roman"">配重活塞：1KG "Times New Roman"">±5g

mso-hansi-font-family:"Times New Roman"">塑料试筒：内径32mm "Times New Roman"">±0.25mm  高度420mm

mso-hansi-font-family:"Times New Roman"">冲洗管：内外6mm "Times New Roman"">±0.5mm      内径4mm mso-hansi-font-family:"Times New Roman"">±0.2mm

mso-hansi-font-family:"Times New Roman"">三、手动砂当量试验仪附件箱清单：

1、试筒      1 "Times New Roman"">套

2、配夹橡胶  1 "Times New Roman"">只

3、试剂      2 "Times New Roman"">瓶

4、冲洗管    1 "Times New Roman"">支

5、配重活塞  1 "Times New Roman"">套

6、虹吸管    1 "Times New Roman"">支

7、说明书    1 "Times New Roman"">本

8、合格证    1 "Times New Roman"">份

mso-hansi-font-family:"Times New Roman"">四、手动砂当量试验仪高浓度氯化钙溶液的配制：

mso-hansi-font-family:"Times New Roman"">按无水氯化钙（g) "Times New Roman"">；蒸流水体积（ml)=1:2 "Times New Roman"">进行配制。氯化钙溶于水时放热，溶液温度升高，待溶液冷却到室温后用滤纸进行过滤，以除去不溶杂质。过滤后的高浓度溶液存放备用，该溶液中氯化钙含量410g/L mso-hansi-font-family:"Times New Roman"">。

1、浓溶液（1L) mso-hansi-font-family:"Times New Roman"">的配制

mso-hansi-font-family:"Times New Roman"">（1 "Times New Roman"">）用量筒量取272ml "Times New Roman"">高浓度氯化钙溶液；

mso-hansi-font-family:"Times New Roman"">（2) "Times New Roman"">用天平称取484.8g "Times New Roman"">丙三醇；

mso-hansi-font-family:"Times New Roman"">（3 "Times New Roman"">）用天平称取13.6g "Times New Roman"">甲醛；

mso-hansi-font-family:"Times New Roman"">（4 "Times New Roman"">）将上述三种试剂转入1L "Times New Roman"">量筒中。转入时要用少量蒸馏水，分别对盛

mso-hansi-font-family:"Times New Roman"">（5 "Times New Roman"">）将1L配毕的溶液倒入2L mso-hansi-font-family:"Times New Roman"">的烧杯或量筒中，混合均匀，装入。

2、制备冲洗液

mso-hansi-font-family:"Times New Roman"">取试验用的浓溶液62.5ml "Times New Roman"">±0.5ml，装入5L mso-hansi-font-family:"Times New Roman"">塑料筒或瓶中，用蒸馏水稀释至2.5 "Times New Roman"">±0.005L "Times New Roman"">。

mso-hansi-font-family:"Times New Roman"">五、手动砂当量试验仪试验方法：

1、目的与适用范围

mso-hansi-font-family:"Times New Roman"">（1 "Times New Roman"">）本方法适用于测定细集料中所含粘性土或杂志的含量，以评定集料的洁净程度，用SE mso-hansi-font-family:"Times New Roman"">表示。

mso-hansi-font-family:"Times New Roman"">（2 "Times New Roman"">）本方法适用于沥青混合料及水泥混凝土用天然砂、人工砂、石屑，其集料最大粒径不得超过4.75mm mso-hansi-font-family:"Times New Roman"">（圆孔筛5mm "Times New Roman"">）

2、仪器与试件

mso-hansi-font-family:"Times New Roman"">本试验需要下列仪器和设备

mso-hansi-font-family:"Times New Roman"">（1 "Times New Roman"">）圆柱形试筒：透明塑料制内径32 "Times New Roman"">±0.025mm, "Times New Roman"">高度420±0.25mm mso-hansi-font-family:"Times New Roman"">。试筒底部起到100 "Times New Roman"">±0.25mm "Times New Roman"">、380±0.25mm mso-hansi-font-family:"Times New Roman"">处刻划标记线，配有橡胶塞。

mso-hansi-font-family:"Times New Roman"">（2 "Times New Roman"">）冲洗管：由一根硬管组成，不锈钢或冷锻铜制其外径为6 "Times New Roman"">±0.5mm，内径为4 mso-hansi-font-family:"Times New Roman"">±0.2mm, "Times New Roman"">管的下部有一个不锈钢两侧 带孔尖头，孔径为1 mso-hansi-font-family:"Times New Roman"">±0.1mm "Times New Roman"">。

mso-hansi-font-family:"Times New Roman"">（3 "Times New Roman"">）塑料筒（5升）：桶口配有插虹弯管的橡胶塞。桶底面高出工作台约1.5m

mso-hansi-font-family:"Times New Roman"">（4 "Times New Roman"">）虹吸弯管和进气弯管：将其插入桶口橡胶塞。

mso-hansi-font-family:"Times New Roman"">（5 "Times New Roman"">）橡胶管（或塑料管）：长约1.5m "Times New Roman"">，内径约5mm "Times New Roman"">，与冲洗管、虹吸弯管联在一起吸液用，配有金属夹，以控制冲洗液流量。

mso-hansi-font-family:"Times New Roman"">（6 "Times New Roman"">）配重活塞由杆、底座、套筒、配重组成。杆长430 "Times New Roman"">±0.25mm "Times New Roman"">；底座直径25 "Times New Roman"">±0.1mm，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1cm mso-hansi-font-family:"Times New Roman"">、宽5mm "Times New Roman"">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1kg "Times New Roman"">±5g.

mso-hansi-font-family:"Times New Roman"">（7 "Times New Roman"">）手动振荡：使试筒产生横向直线往复运动。振幅：20.3 "Times New Roman"">±1.0cm，运动周期180 mso-hansi-font-family:"Times New Roman"">±2 "Times New Roman"">次/min

mso-hansi-font-family:"Times New Roman"">（8 "Times New Roman"">）天平:称量1kg. mso-hansi-font-family:"Times New Roman"">感量1g

mso-hansi-font-family:"Times New Roman"">（9 "Times New Roman"">）烘箱：能使温度控制在105 "Times New Roman"">±5℃

mso-hansi-font-family:"Times New Roman"">（10 "Times New Roman"">）广口漏斗（塑料制）：口的直径100mm "Times New Roman"">左右

mso-hansi-font-family:"Times New Roman"">（11 "Times New Roman"">）一把长500mm "Times New Roman"">的钢板尺，刻度精确到1mm

mso-hansi-font-family:"Times New Roman"">（12) "Times New Roman"">一个筛孔4.75mm "Times New Roman"">（圆孔为5mm) "Times New Roman"">和筛底。

mso-hansi-font-family:"Times New Roman"">（13 "Times New Roman"">）一个刮刀和一把勺子。

mso-hansi-font-family:"Times New Roman"">（14 "Times New Roman"">）温度计。

mso-hansi-font-family:"Times New Roman"">（15 "Times New Roman"">）其他：一升量筒、2 "Times New Roman"">个烧杯、刷子、盘子、小铝盒等

3、试验步骤：

mso-hansi-font-family:"Times New Roman"">为了不影响沉淀的过程，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。

mso-hansi-font-family:"Times New Roman"">试验过程中，冲洗液的温度应保持20 mso-hansi-font-family:"Times New Roman"">±2 "Times New Roman"">℃范围内。

mso-hansi-font-family:"Times New Roman"">由于塑料在太阳光下容易变成不透明，应尽量避免将塑料器皿直径暴露在太阳光下。盛试验溶液的塑料器皿用完后要清洗干净。

mso-hansi-font-family:"Times New Roman"">（1 "Times New Roman"">）用冲洗管将冲洗液吸入试筒直到100mm "Times New Roman"">刻度---（约需80ml mso-hansi-font-family:"Times New Roman"">）。

mso-hansi-font-family:"Times New Roman"">（2 "Times New Roman"">）把相当于120 "Times New Roman"">±1g干料重的试样用漏斗仔细地倒入竖立的试筒中。

mso-hansi-font-family:"Times New Roman"">（3 "Times New Roman"">）用手掌反复敲打筒下部，以除去气泡，使试样尽快润湿，然后静置10min.

mso-hansi-font-family:"Times New Roman"">（4 "Times New Roman"">）在试样静置10 "Times New Roman"">±1min结束后，用橡胶塞堵住试筒。

mso-hansi-font-family:"Times New Roman"">（5 "Times New Roman"">）手动振荡：使试筒产生横向直线往复运动。振幅;20.3 "Times New Roman"">±1.0cm，运动周期180 mso-hansi-font-family:"Times New Roman"">±2 "Times New Roman"">次/min.振荡拧下橡胶完成塞。

mso-hansi-font-family:"Times New Roman"">（6 "Times New Roman"">）将冲洗管插入试筒中，用冲洗液迅速冲洗附在试筒壁上的集料然后将冲洗管插到试筒底部，慢慢转动冲洗管，同时匀速缓缓提高冲洗管，使附着在集料表面的细粒杂质浮上来，直到溶液达到380mm mso-hansi-font-family:"Times New Roman"">刻度线为止。

mso-hansi-font-family:"Times New Roman"">（7 "Times New Roman"">）缓慢匀速向上拔出冲洗管，当液面位于380mm "Times New Roman"">刻度是，切断冲洗管的液流，使液面保持380mm "Times New Roman"">刻度线，在没有扰动的情况下静置20min "Times New Roman"">±15S。

mso-hansi-font-family:"Times New Roman"">测量：

mso-hansi-font-family:"Times New Roman"">（1 "Times New Roman"">）静置20分钟后，用钢板尺在试筒外测量从试筒底部到絮凝物上液面的高度，即h1 mso-hansi-font-family:"Times New Roman"">（如有可能，同时测得从试筒底部到沉淀物上液面的高度，即h2, mso-hansi-font-family:"Times New Roman"">此项作为与活塞测量的砂当量值的参考值），准确到1mm mso-hansi-font-family:"Times New Roman"">。

mso-hansi-font-family:"Times New Roman"">（2 "Times New Roman"">）将配重活塞套筒在试筒口放好，使配重活塞徐徐落入试筒，直至碰到沉淀物时，立即拧紧固定螺丝，将尺子插入套筒的开口处，使零点对准的底面。从套筒处读取沉淀物高度，即h2, mso-hansi-font-family:"Times New Roman"">准确至1mm "Times New Roman"">。上述测量过程应在30 "Times New Roman"">秒内完成。同时记录试筒内的温度，准确至1 "Times New Roman"">℃。

mso-hansi-font-family:"Times New Roman"">以上步骤进行二个试样的平行试验。

4、结果与计算：

4.1试样用活塞测定砂当量值按JTJ058-2000公路规程式（5.1 mso-hansi-font-family:"Times New Roman"">）计算：

SE=（h2/h1) mso-hansi-font-family:"Times New Roman"">×100%

mso-hansi-font-family:"Times New Roman"">式中：SE "Times New Roman"">为试样的砂当量，%

h1为试筒中絮凝物和沉淀物的总高度，mm

h2为试筒中用活塞测定沉淀物的高度，mm

4.2试样的目测砂当量值按JTJ058-2000公路规程式（5.2 mso-hansi-font-family:"Times New Roman"">）计算：

SEV=(h2/h1)×100%

mso-hansi-font-family:"Times New Roman"">式中：SEV "Times New Roman"">为试样的目测砂当量值：

h1为试筒中絮凝物和沉淀物的总高度，mm

h2为试筒中用目测测定沉淀物的高度，mm

4.3一种集料应平行测定两次，集料的砂当量SE mso-hansi-font-family:"Times New Roman"">或SEV "Times New Roman"">是二个试样平行测定的砂当量平均值，以活塞测量为准，并以整数表示。