影響熟石膏粉凝固速度的因素有哪些？
What are the factors influencing the setting speed of gypsum powder?
有熟石膏粉的質(zhì)量头谜、熟石膏粉與水調(diào)合的比例不當(dāng)骏掀、攪拌的時(shí)間和速度、水溫柱告。
There are the quality of gypsum powder, improper proportion of gypsum powder and water, mixing time and speed, and water temperature.
熟石膏操作注意： 1.石膏粉與水調(diào)合后退博，若發(fā)現(xiàn)水粉比例不合適時(shí)，應(yīng)重取量調(diào)和旋囤。 2.攪拌的速度不宜過(guò)快别印，以免人為帶入氣泡，形成過(guò)多的結(jié)晶凯怕，導(dǎo)致石膏膨脹嫁昌，強(qiáng)度降低。 3.灌注模型時(shí)應(yīng)從一側(cè)逐漸到另一側(cè)甩楷，震蕩灌注锁荚，排除氣泡，注滿各細(xì)微部分催锯。 4. 石膏在凝固過(guò)程中存在體積膨脹滴练。
Notes for plaster of Paris operation: 1 After mixing gypsum powder with water, if the proportion of water powder is found to be inappropriate, it shall be re measured and mixed. 2. the mixing speed should not be too fast, so as to avoid artificially bringing in bubbles and forming too many crystals, resulting in gypsum expansion and strength reduction. 3. pour the model gradually from one side to the other side, vibrate and pour, eliminate bubbles, and fill each fine part. 4. there is volume expansion of gypsum during solidification.
不過(guò)讓石膏凝固速度降慢的方法是在把石膏粉加水的時(shí)候使用溫度較低的涼水 水越?jīng)瞿趟俣染驮铰?反之用熱水就會(huì)很快。 是根本不用參任何東西的孵熏。如果覺得這個(gè)辦法不行還可以加入檸檬酸或者先在石膏粉里摻好膩?zhàn)臃厶Γ谒飺缴?08膠白乳膠和纖維素，再調(diào)和捺氢。石膏的凝固時(shí)間一般取決與石膏粉的標(biāo)號(hào)標(biāo)號(hào)高的一般就凝結(jié)的快藻丢。
However, the way to slow down the setting speed of gypsum is to use cold water with lower temperature when adding water to gypsum powder. The cooler the water is, the slower the setting speed will be. On the contrary, using hot water will be very fast. There is no need to participate in anything at all. If you think this method is not feasible, you can also add citric acid or add putty powder into gypsum powder, add 108 glue white emulsion and cellulose into water, and then mix. The setting time of gypsum generally depends on the grade of gypsum powder. High grade generally sets fast.
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