粉刷石膏是半水石膏和其它石膏相、各種外加劑和附加材料組成的新型抹灰材料，它能同水泥一樣現(xiàn)拌現(xiàn)用，不僅可以在水泥砂漿混合砂漿底層上罩面，也可以在混凝土大板墻面、鎂質(zhì)輕板墻面和石膏板墻面等光滑的底層上罩面。罩面層無論怎樣薄都不會開裂起殼，硬化后的表面堅(jiān)硬，光滑細(xì)膩，不起灰，裝飾效果好。在石膏抹灰層的表面進(jìn)行再裝飾，如貼墻紙、刷涂料等，不但省工、省料、不反潮，還因表面堿度低，可顯著地增加與裝飾材料的粘結(jié)強(qiáng)度，防止因堿化而使涂料起皮、變色，或墻紙脫膠、卷角等弊病，使裝修工程質(zhì)量更為可靠，由于石膏的呼吸作用，還可以在一定的范圍內(nèi)調(diào)節(jié)室內(nèi)空氣的濕度，提高舒適度。
Plastering gypsum is a new plastering material composed of hemihydrate gypsum and other gypsum phases, various admixtures and additional materials. It can be mixed and used as cement. It can not only cover the cement mortar mixed mortar bottom layer, but also cover the smooth bottom layers such as concrete large board wall, magnesium light board wall and gypsum board wall. No matter how thin the cover layer is, it will not crack and shell. After hardening, the surface is hard, smooth and fine, no dust, and the decorative effect is good. Re decoration on the surface of gypsum plastering layer, such as pasting wallpaper and painting, not only saves labor, materials and moisture, but also significantly increases the bonding strength with decorative materials due to low surface alkalinity, so as to prevent coating peeling and discoloration due to alkalization, or wallpaper degumming and corner rolling, so as to make the quality of decoration project more reliable. Due to the breathing effect of gypsum, It can also adjust the humidity of indoor air within a certain range to improve comfort.
在粉刷石膏中加入石粉取代部分石膏和天然砂，不僅可以緩解天然砂供應(yīng)不足的問題，而且可以降低成本，提高粉刷石膏工廠的經(jīng)濟(jì)效益。本文通過比較研究石粉摻入粉刷石膏中取代部分石膏和天然砂對粉刷石膏性能的影響，得出了石粉用于粉刷石膏可行的結(jié)論，給出了摻入石粉后粉刷石膏的理想配比，并且將此配比進(jìn)行大批量的生產(chǎn)，用于了實(shí)際工程，在滿足施工要求的前提下取得了良好的經(jīng)濟(jì)效益。
Adding stone powder to the plastering gypsum to replace part of gypsum and natural sand can not only alleviate the problem of insufficient supply of natural sand, but also reduce the cost and improve the economic benefits of the plastering gypsum factory. In this paper, by comparing and studying the influence of stone powder added into plastering gypsum to replace part of gypsum and natural sand on the performance of plastering gypsum, it is concluded that stone powder is feasible for plastering gypsum, and the ideal ratio of plastering gypsum after adding stone powder is given. This ratio is produced in large quantities and used in practical engineering, On the premise of meeting the construction requirements, good economic benefits have been obtained.
原材料的選擇
Selection of raw materials
脫硫石膏
Desulfurized gypsum
根據(jù)脫硫石膏的特性及工程使用需求，在選擇用于配制粉刷石膏的脫硫石膏時應(yīng)注意以下兩點(diǎn)：
According to the characteristics and engineering use requirements of desulfurization gypsum, the following two points should be paid attention to when selecting desulfurization gypsum for preparing plastering gypsum:
控制有害雜質(zhì)的含量。Cl-、Na+、K+屬有害成分，含量過高不但會使石膏的脫水性下降，還會造成粉刷石膏表面返霜，影響材料的粘結(jié)強(qiáng)度，易出現(xiàn)空鼓開裂。一般控制Cl-含量小于0.01％，Na20、K20的含量宜小于0.06％。
Control the content of harmful impurities. Cl -, Na +, K + are harmful components. Too high content will not only reduce the dehydration of gypsum, but also cause frost return on the surface of plastered gypsum, affect the bonding strength of materials, and prone to hollowing and cracking. Generally, the content of Cl - should be less than 0.01%, and the content of Na20 and K20 should be less than 0.06%.
保證良好的顆粒級配。脫硫石膏比表面積相對較小，顆粒大小較為均勻，粒徑分布較窄，主要集中在40-60級配遠(yuǎn)遠(yuǎn)差于天然石膏磨細(xì)后的石膏粉，不利于施工同時對強(qiáng)度也有一定的影響。
Ensure good particle grading. The specific surface area of desulfurized gypsum is relatively small, the particle size is relatively uniform, and the particle size distribution is narrow. It is mainly concentrated in the 40-60 grading, which is far worse than the gypsum powder ground by natural gypsum, which is not conducive to construction and has a certain impact on the strength.
為保證脫硫石膏良好的顆粒級配，應(yīng)對脫硫石膏進(jìn)行粉磨加工后方可應(yīng)用。根據(jù)以上原則，本文確定選用河北某電廠煙氣脫硫石膏，初凝時間17min，終凝時間21min，2h抗折強(qiáng)度3.88Mpa，抗壓強(qiáng)度9.92Mpa，pH值7.0，堿含量0.02％，
In order to ensure good particle gradation of desulfurization gypsum, desulfurization gypsum shall be grinded before application. According to the above principles, the flue gas desulfurization gypsum of a power plant in Hebei is selected in this paper, with initial setting time of 17min, final setting time of 21min, 2h, flexural strength of 3.88mpa, compressive strength of 9.92mpa, pH value of 7.0 and alkali content of 0.02%,
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