自流耐火浇注料自流值试验方法
自流耐火浇注料自流值试验方法
A.1仪器、设备
A.1.1锥形模:上口直径70mm,下口直径100mm,高度60mm。
A.1.2卡尺:精确度为0.1mm的标准卡尺。
A.1.3流动度测定仪:NLD-2型水泥胶砂流动度测定仪。
A.1.4搅拌机:浇注料的搅拌设备应符合YB/T 5202.1的规定。
A.1.5秒表/定时器:精确度1s。
A.1.6量筒:精确到1mL。
A.2试验步骤
A.2.1试验条件应符合本标准的规定,除非浇注料制造商有其它的特殊规定。
A.2.2应将室温和水温控制在15℃~25℃,料温与空温相平衡。
A.2.3应确保所用的设备清洁、于燥。流动盘保持水平并清除表面上的任何杂物。
A.2.4量取添加的水,精确到±1mL
A.2.5将浇注料干混30s。
A.2.6开启秒表/定时器,在搅拌机运行当中10s内加完水。注意不要撒掉任何水和干料。湿混1min后,停下搅拌机,检查锅底是否有未湿润的料,需要时用手搅拌,重新开启搅拌机。所有的搅拌在低速下进行。加水后总的搅拌时间为5min。
A.2.7自流值的测量应在搅拌后1min内进行。将锥形模放到流动盘的中间,模子的大头朝下。一边用铲刀轻轻拌和试样一边将其倒入模子,不要振动模子。将模子填满,与模子的顶缘齐平。如试样溢出到流动盘上,须将盘子擦干擦净。
A.2.8跳桌法操作方法
A.2.8.1小心提起模子,不要旋转或将模子倾斜。在模子与浇注料脱离的一瞬间,马上开启流动度测定仪开关进行检测。检测的同时,用手指擦干净粘附在模子上的浇注料,并轻轻地放回到试样中。当用手接触试样时,为不使材料粘附在手上以减少颗粒损失,应戴橡皮或乳胶手套。
A.2.8.2当流动度测定仪跳动15次后,迅速关闭开关,并快速进行自流值的测量。
A.2.9自流法操作方法
A.2.9.1小心提起模子,不要旋转或将模子倾斜。检测的同时,用手指擦干净粘附在模子上的浇注料,并轻轻地放回到试样中。当用手接触试样时,为不使材料粘附在手上以减少颗粒损失,应戴橡皮或乳,胶手套。
A.2.9.2试样流动60s后,要快速进行自流值的测量。
A.2.10以约45°间隔的四个对应点测量试样的直径,如果测试样直径的部位局部不规则,可选在更有代表性的附近区域测量。记录4个测量值,精确到1mm。
A.3计算
自流值按式(A.1)计算:
自流值=(D1+D2+D3+D4)/4……………….(A.1)
式中:
D1、D2、D3、和D4,–分别是测量的第1、第2、第3和第4个直径,单位为毫米(mm)
Test method for free flow value of free flow refractory castable
A.1 Instruments and Equipment
A.1.1 Conical die: upper diameter 70mm, lower diameter 100mm, height 60mm.
A.1.2 Calipers: Standard calipers with an accuracy of 0.1mm.
A.1.3 Fluidity tester :NLD-2 cement mortar fluidity tester.
A.1.4 Agitator: The agitating equipment for castables shall comply with the provisions of YB/T 5202.1.
A.1.5 Stopwatch/timer: Accuracy 1s.
A.1.6 Measuring cylinder: accurate to 1mL.
A.2 Test Procedures
A.2.1 Test conditions shall comply with the provisions of this Standard, unless otherwise specified by the castable manufacturer.
A.2.2 The room temperature and water temperature should be controlled at 15℃~25℃, and the material temperature and air temperature should be balanced.
A.2.3 Ensure that the equipment used is clean and dry. Keep the flow plate level and remove any debris from the surface.
A.2.4 Measure the added water accurately to ±1mL
A.2.5 Dry mix castable for 30 seconds.
A.2.6 Turn on the stopwatch/timer and add water within 10s during the running of the mixer. Be careful not to scatter any water or dry material. After 1min of wet mixing, stop the mixer, check whether there is any unwet material in the bottom of the pan, stir by hand if necessary, and turn the mixer on again. All mixing is done at low speed. The total stirring time after adding water is 5min.
A.2.7 The measurement of the artesian flow value should be carried out within 1min after stirring. Place the cone mold in the middle of the flow plate with the end of the mold facing down. Pour the sample into the mold while gently mixing it with a spatula, without vibrating the mold. Fill the mold so that it is flush with the top edge of the mold. If the sample spills onto the tray, the tray should be wiped dry.
A.2.8 Operation method of jumping table
A.2.8.1 Carefully lift the mold, do not rotate or tilt the mold. At the moment when the mold is separated from the castable, the flow meter switch is turned on immediately for detection. At the same time as testing, use your fingers to wipe away the castables adhering to the mold and gently return them to the sample. When touching samples with hands, rubber or latex gloves should be worn in order not to adhere the material to the hands to reduce particle loss.
A.2.8.2 When the flow meter beats for 15 times, quickly turn off the switch and quickly measure the flow value.
A.2.9 Operation Method of artesian flow Method
A.2.9.1 Carefully lift the mold, do not rotate or tilt the mold. At the same time as testing, use your fingers to wipe away the castables adhering to the mold and gently return them to the sample. When touching the sample with the hand, in order not to make the material adhere to the hand to reduce particle loss, rubber or latex gloves should be worn.
A.2.9.2 The flow value of the sample should be measured quickly after 60 seconds.
A.2.10 The diameter of the sample is measured at four corresponding points spaced approximately 45° apart. If the part of the diameter of the test sample is locally irregular, it may be measured at A more representative nearby area. Record 4 measurements accurate to 1mm.
A.3 Calculation
The artesian value is calculated according to equation (A.1) :
Artesian value =(D1+D2+D3+D4)/4………………. (A.1)
Formula:
D1, D2, D3, and D4 — the first, second, third, and fourth diameters measured in millimetres (mm), respectively
