【正文】 ?？怂篂樗麄兲峁﹥x器捐贈。聚酯膠粘劑的剩余抗壓強(qiáng)度隨使用溫度上升上升至100℃后下降，直至230℃它的抗壓強(qiáng)度完整消失。然后這個洞應(yīng)該被清除，必要時要壓縮空氣。對于兩個黏合劑來說，在鋼界面溫度超過180℃和230℃一個有效的錨固長度將降低。在達(dá)到峰值強(qiáng)度值之后，隨溫度的升高強(qiáng)度逐漸下降。在較高溫度下，粘接強(qiáng)度變差。溫度是接近HDT。不過，在溫度約230℃以上，在負(fù)載下崩潰的標(biāo)本，顯示非常小的抗壓強(qiáng)度。這些樣品中的一條曲線，圖中所示的粗線，表明在分裂2 ram后粘接強(qiáng)度提高。裂縫始于立方體底部, 隨著負(fù)荷增加，他們發(fā)展到了立方體的兩側(cè)，把立方體分裂成兩半。測量的支路在同一個敏感的幫助欄卸載結(jié)束時，能夠測量高達(dá)三毫米。壓縮測試中膠粘劑也投入管（直徑19毫米，長38毫米）。(a)聚酯樹脂砂漿（40美元）：由兩部分組成的樹脂砂漿，一部分是聚酯樹脂，另一部分是20℃下處理40分鐘的凝膠劑?；谶@個原因，選擇邊長150毫米的立方體、12毫米高的拉伸變形靶，其裝配垂直軸如圖1 所示[4]。2 實(shí)驗(yàn)方法 對于鍵強(qiáng)測試的正確方法研究人員之間有意見分歧，因此全世界范圍內(nèi)仍未能行成一個標(biāo)準(zhǔn)的測試程序。為了加深對聚合物粘合劑力學(xué)性能的研究，通過實(shí)驗(yàn)進(jìn)行了深入的研究。與多數(shù)有機(jī)材料一樣，高分子樹脂也易燃。盡管熱變形溫度很容易通過實(shí)驗(yàn)測定，但暴露在高于熱變形溫度錨加固劑的殘余特性對于結(jié)構(gòu)混凝土、維修和結(jié)構(gòu)重建等工程是特別重要的。熱變形溫度（HDT）是指聚合物材料從一個堅硬的玻璃態(tài)變到粘流態(tài)的變化溫度或溫度范圍。眾所周知，混凝土具有良好的熱性能。不過，后者的操作可能會導(dǎo)致部分或完全由于焊接過程中形成的高溫而損失。在施工前，了解他們的行為是很重要的。此外，該膠黏劑的質(zhì)地發(fā)生了變化，失去了凝聚力。所有樣品暴露在不同溫度下，允許冷卻到室溫。測試的膠黏劑是聚酯樹脂膠粘劑和環(huán)氧樹脂。Product Data File39。, International Conference on Bond in Concrete39。,CEB Bulletin No 131, AICAPCEB Symposium, Rome,1979, pp. 67122.3. RILEM/CEB/FIP Tentative Remendations: 39。 a weak material would indicate plete loss of strength. ACKNOWLEDGEMENTSThe authors wish to express their thanks to S. E Waters,S. Smith, R. Grace and J. D. Webster for their technical support. Fosroc Expandite Ltd is acknowledged for the donation of the adhesives. REFERENCES1. 39。pull out test39。2001年03期附錄A外文文獻(xiàn)Residual bond strength of polymer adhesive anchoredreinforcement subjected to high temperaturesThe results are presented of an experimental project into the residual strength characteristics of polymer adhesives used in anchoring steel reinforcement bars, following exposure to elevated temperatures. The adhesives tested were polyester resin and epoxy resin grouts. Two types of experiment were undertaken designed to investigate the residual bond strength as well as the pressive strength of specimens. For the bond strength determination, pullout tests were carried out on 150 mm cubes. Compressive tests were undertaken on small cylindrical specimens. All specimens were exposed to different temperatures in preheated ovens and then allowed to cool down to normal laboratory temperatures prior to testing. In the bond tests,two types of failure were observed: splitting and slipping. Splitting of the cubes occurred in specimens exposed to temperatures below about 200℃,and the adhesive characteristics werein general enhanced. Slipping failures, by pulling through the adhesive, were obtained in specimens exposed to hiyher temperatures than about 200℃,and both the residual bond and pressive strengths were observed to diminish with increasing temperature. Additionally, the texture of the adhesive had changed, losing its cohesiveness. Based on this observation, an approach for assessing the in situ bond capacity of anchors is proposed.1. INTRODUCTIONPolymer adhesives are being used extensively all over the world for the repair and rehabilitation of structures damaged by earthquakes or showing distress due to ageing, environmental exposure and other causes. Such adhesives have diverse chemical, thermal and mechanical properties [1] and it is important to understand their behaviour prior to using them in of the important uses of polymer adhesives is the anchoring of steel reinforcement to concrete. In some applications, shorter starter bars are inserted into predrilled holes, which are then grouted with steel reinforcement is then connected to the starters either by lapping or through couplers。熱固性樹脂。國內(nèi)水性聚氨酯膠粘劑產(chǎn)品及應(yīng)用現(xiàn)狀[J]。2002年06期[18]劉建雄。中國膠粘劑。耐高溫環(huán)氧—有機(jī)硅—酚醛樹脂涂料的研制[D]。2005年05期[14]黃志雄,彭永利。長安大學(xué)。有機(jī)硅聚氨酯丙烯酸酯預(yù)聚物的合成、表征及感光性[J]。在此向兩位老師表示深深的謝意。李老師嚴(yán)謹(jǐn)?shù)闹螌W(xué)態(tài)度、勇于開拓的創(chuàng)新精神，開拓性的思維方式、孜孜不倦的工作熱情、求實(shí)的精神，都深深地影響著我，使我在大四最后一學(xué)期里受益匪淺。結(jié)論(1)通過實(shí)驗(yàn)數(shù)據(jù)可以看出，環(huán)氧樹脂乳液與固化劑(T31)配比為100：10時，拉拔力為最大。? 將固化好的樣品進(jìn)行拉拔試驗(yàn)，得到如下數(shù)據(jù)：第一組環(huán)氧乳液固化劑 水泥細(xì)砂Fmax/N平均值/N1 1001050130123912622143231117410015702112251174614917100201044108081423977310100253956351170812802第二組環(huán)氧乳液固化劑水泥細(xì)砂Fmax/N平均值/N1 100105015095111312117131273410015917706533568687100205424348326943410100252842861115312423第三組環(huán)氧乳液固化劑水泥細(xì)砂Fmax/N平均值/N1 1001050170835636264634334100155215395563653571002046151385479531101002546132711358121644 結(jié)果與討論通過數(shù)據(jù)對比看出，三組當(dāng)中最大拉拔力都是按環(huán)氧樹脂與固化劑按100：15的比例配出來的；固化劑的用量與錨固性能是成反比的。用直徑為6cm的紙杯量取30g環(huán)氧樹脂乳液，在環(huán)氧樹脂乳液不變的條件下再分別加入固化劑(T31)3g，6g。所制得的錨固劑既有水泥的耐高溫性能，又有環(huán)氧樹脂乳液良好的粘結(jié)性能，由于市售T31比較廉價，所以大大降低了成本。擴(kuò)散及交聯(lián)固化成膜的反應(yīng)機(jī)制充分說明，水分的揮發(fā)及固化劑擴(kuò)散速度是極重要的技術(shù)關(guān)鍵，環(huán)氧分散相的粒徑愈小，固化劑與環(huán)氧的相容性愈好，少量成膜助劑的使用及合適的水蒸發(fā)的控制手段都將直接影響成膜的過程及性質(zhì)。由于這是一種以溶有固化劑的水為連續(xù)相，環(huán)氧樹脂為分散相的多相體系，涂裝后水分在適當(dāng)蒸汽壓條件下會逐漸揮發(fā)。隨著生產(chǎn)技術(shù)的不斷成熟和發(fā)展，水性環(huán)氧樹脂的應(yīng)用前景良好。本實(shí)驗(yàn)由于水泥的加入，其耐高溫性能將遠(yuǎn)遠(yuǎn)提高。水泥漿體就是這樣獲得強(qiáng)度而硬化的。所以現(xiàn)在比較統(tǒng)一的認(rèn)識是：水泥水化初期生成了許多膠體大小范圍的晶體如CSH(B)和一些大的晶體如Ca(OH)2包裹在水泥顆粒表面，它們這些細(xì)小的固相質(zhì)點(diǎn)靠極弱的物理引力使彼此在接觸點(diǎn)處粘結(jié)起來，而連成一空間網(wǎng)狀結(jié)構(gòu)，叫做凝聚結(jié)構(gòu)。 水泥的凝結(jié)和硬化，是一個復(fù)雜的物理—化學(xué)過程，其根本原因在于構(gòu)成水泥熟料的礦物成分本身的特性。凝結(jié)是指水泥漿體從可塑性變成非可塑性，并有很低的強(qiáng)度的過程；硬化是指漿體強(qiáng)度逐漸提高能抵抗外來作用力的過程。如果原先還摻有集合料如砂、石子等，水泥就會把它們膠結(jié)在一起，變成堅固的整體，即我們常說的混凝土。水性環(huán)氧樹脂配合固化劑最為廣泛的用途是用作涂料。填料的種類很多，要視具體要求進(jìn)行選樣，并要考慮到填料的粒度、形狀和填加量等因素，這是配制環(huán)氧樹脂膠粘劑的一個重要問題。（4） 促進(jìn)劑：為了加速環(huán)氧樹脂