The product series of coated sand efficiently solved the problems: insufficiency of organic binder in high temperature, high expansivity of natural silica sand and much gas of coating of organic molecular in high temperature.

覆膜砂系列產品有效解決鑄造材料有機粘結劑高溫性能不足无码黄片视频，天然硅砂熱膨脹率高和有機高分子高溫汽化發(fā)氣量大的關鍵技術難題玖玖爱精品视频在线观看免费2。

When used in reclaimed sand,this binder has many drawbacks,such as low strength,high viscosity and so on,which hindered greatly its application and development in the reclaimed sand.

用于再生舊砂国产视频福利导航，這種粘結劑存在強度低黄色网站免费精品、粘度大等缺陷，嚴重制約了它在再生舊砂中的應用JIZZ日本国产大陆内射极品。

The influences of BY binder on molding sand properties was analysed sysemically and the best proportion BY of bentonite,BY binder,moisture content and coal dust is found by integrative element experiments and singleelement experiments.

分析了BY粘結劑對型砂性能的影響日韩亚洲欧美高清专区，并通過正交試驗和單因素試驗，找出了膨潤土55夜色66夜色国产精品视频、BY粘結劑爱爱人人、水分和煤粉四種原材料在型砂中的最佳配比；探討了BY粘結劑的經濟效益欧美日韩午夜影院人妻。

In order to determine the optimal proportion of magnesium phosphate cement-based binder, influences of setting adjusting agent, ratio of phosphate to magnesia, ratio of binder to sand, and addition of fly ash on the setting time and strength development of MPB paste and mortar was studied. The compatibility between MPB and traditional concrete and the hardening mechanism of MPB were also investigated.

為了確定磷酸鹽膠凝材料的最佳配合比，研究調凝組份99精品国产高清久久久久久、磷酸鹽/MgOw(P/w日本高清中文字幕、灰砂比、摻粉煤灰對MPB膠凝材料凝結時間和強度發(fā)展等的影響規(guī)律美女被操下面，并分析它與傳統水泥混凝土間的兼容性及其硬化機理殴美A片免的视频刺激的。

It provided the reference to improve the anti-cracking capability of high strength and high performance concrete from the point of view of constructional technology and curing requirement.The result shows that the more the binder material or sand rate, the more serious the shrinkage cracking. In the concrete with a low water-to-binder ratio, a bit of difference in the dosage of water will result in big difference on the strength and the anti-cracking capability. The occurrence of cracking is mainly at early age (before 1 day). If the surface is plastered again after 2 hours of casting, the anti-cracking capability will nicely improved.

研究結果表明：隨著膠結料總量和砂率的增大，高強高性能混凝土的收縮開裂趨于嚴重亚洲国产区中文在线观看www；在水膠比較低的情況下永久免费看A片无码不卡网站，用水量的稍微差別對混凝土的強度和抗裂性能都具有很大的影響；摻入粉煤灰對抗裂有所改善韩国2022最新理论电影，但是其摻量對抗裂的影響并不是呈定向規(guī)律女的高潮喷水视频，而是存在著最優(yōu)摻量；高強高性能混凝土的裂縫主要發(fā)生在早期(1d前)，若在澆注后2個小時再次抹面可以很好地改善其抗裂性能在线观看黄A片免费网站啊别停。

Effects of dry temperature and dry time on properties of heat cured sand and the relationship with binder composition are as follows:sands bonded by binders that are not modified have high strength when dry temperature is high and dry time is long,but their anti-wettability power is poor . Sands bonded by binders that are modified by B but not modified by M can be dried quickly and sand strength is high but anti-wettability power is also poor. Sands bonded by binders that are modified by M but not modified by B can also be dried quickly to obtain maximum strength,then the strength becomes lower when they are dried continually for more time. and sand strength is high but anti-wettability power is also poor. Sands bonded by binders that are modified by M as well as by B at the same time can be dried quickly to obtain maximum strength at low temperature and short time. But the anti-wettability of sand mold is best when they are dried at high temperature and long time.

烘干溫度和烘干時間對熱硬砂性能的影響及其與粘結劑改性的關系是：未經改性劑B和改性劑M改性的粘結劑砂欧美精品13页爽爽在线播放，脫水速度較慢，烘干溫度越高欧洲精品无码毛片，時間越長美性爱，則硬化強度也越高，但未經改性的粘結劑熱硬砂的抗吸濕性較差国产又粗又大在线观看；經改性劑B而不經改性劑M改性的粘結劑熱硬砂www.BLA片，烘干硬化速度較快，強度也高黄色精品视频在线观看精品免费，但在高濕度下的抗吸濕性不好曰韩一级A片特黄无码；經改性劑M改性而不經改性劑B改性的粘結劑熱硬砂，烘干時強度先隨烘干時間升高至最大值后九九99久久精品精品国产，繼續(xù)烘干時強度又出現下降人人操免费AV；經改性劑B和經改性劑M共同改性的粘結劑熱硬砂能在短時間和較低的烘干溫度下就可烘干到最高強度，即烘干脫水的速度較快日韩一区网站，但試樣的抗吸濕性差上海一级黄片，若在更高溫度和更長時間下烘干，試樣的抗吸濕性得到改善2017综合色五月天，綜合考慮烘干強度和抗吸濕性要求欧美一级高清片，對于φ30×30mm試樣，理想的烘干溫度是200℃中文字幕第五二区第一页，烘干時間20分鐘无码一级毛片一区二区。

Based on the calculation methods of nominal water-cement ratio of mortar and average paste thickness of standard sand provided by authors, the nonlinear relation between fluidity of mortar and nominal water-cement ratio of mortar , average paste thickness of standard sand, fly ash-binder ratio was established by using artificial neural network.

在給出水泥膠砂名義水灰比和標準砂平均漿體厚度計算方法的基礎上，采用人工神經網絡方法国产一区中文字幕，建立了水泥膠砂流動度與水泥膠砂名義水灰比又粗又硬的免费黄色网站、標準砂平均漿體厚度、粉煤灰與膠凝材料用量比之間的非線性映射關系18水女人一级黄色。

Based on the calculation methods of nominal water-cement ratio of mortar and average paste thickness of standard sand provided by authors, the nonlinear relation between fluidity of mortar and nominal water-cement ratio of mortar, average paste thickness of standard sand, fly ash-binder ratio was established by using artificial neural network.

摘要在給出水泥膠砂名義水灰比和標準砂平均漿體厚度計算方法的基礎上99热这里精品5，采用人工神經網絡方法，建立了水泥膠砂流動度與水泥膠砂名義水灰比91精选自拍、標準砂平均漿體厚度女人高潮被爽到呻吟的视频、粉煤灰與膠凝材料用量比之間的非線性映射關系。

The quick setting and rapid hardening sand-cast cement is a new type of excellentinorganic binder for foundry molding sand.

歡快型砂水泥具有常溫下凝結硬化快有哪些黄色网址，高溫下殘留強度低嫩草偷拍精品偷拍视频，凝結時間可在一定范圍內用緩凝劑調節(jié)等特性，所以是一種粘結鑄造用砂的新型無機粘結劑55亚洲精品。

The fractured surfaces and the structure of the resin binder links, which exist in nitrogen-free high-furfuryl-alcohol resin sand mixture and in high-nitrogen content low-furfuryl-alcohol resin sand mixture respectively are investigated by the aid of scanning electronic microscope.

本文通過掃描電鏡分別對高糠醇無氮樹脂砂和低糠醇高氮樹脂砂斷口的破裂形式一个人看的www在线高清图片，樹脂膜組織結構進行了觀察和研究。