發(fā)布時(shí)間：2018-02-04 21:49

  本文關(guān)鍵詞： CaO膨脹劑 表面包裹 聚乳酸 膨脹性能　出處：《新型建筑材料》2017年09期 　論文類型：期刊論文

【摘要】：利用聚乳酸(PLA)表面包裹改性CaO膨脹劑,采用約束變形測試方法和改進(jìn)的雙圓環(huán)方法,系統(tǒng)研究了0.5%、1.0%和2.0%PLA包裹改性CaO對(duì)約束密封條件下水泥凈漿、砂漿及混凝土膨脹性能的影響。結(jié)果表明:相比未改性CaO膨脹劑,PLA包裹改性后CaO膨脹率明顯提升,且隨著包裹率增加膨脹率增幅擴(kuò)大;相比于摻未改性CaO膨脹劑的凈漿、砂漿和混凝土,摻PLA包裹率為2.0%的CaO-PLA膨脹劑可使水泥凈漿和砂漿28 d膨脹率分別提高27.4%和17.6%,混凝土密封養(yǎng)護(hù)和水養(yǎng)膨脹率分別提高51.1%和32.4%;砂漿膨脹應(yīng)力40 h提高了45%。
[Abstract]:The modified CaO expander was modified by polylactic acid lactic acid (PLA) surface, and 0.5% was systematically studied by using the constraint deformation test method and the improved double ring method. The effects of 1.0% and 2.0 PLA-coated modified CaO on the expansive properties of cement mortar, mortar and concrete under confined sealing conditions were investigated. The results showed that the modified CaO expander was better than that of unmodified CaO. After the modification of PLA, the expansion rate of CaO was obviously increased, and the expansion rate increased with the increase of encapsulation rate. Compared with unmodified CaO expansion agent, mortar and concrete. The expansion ratio of cement mortar and mortar increased by 27.4% and 17.6% in 28 days, respectively, when the CaO-PLA expander with PLA entrapment ratio of 2.0% was used. The concrete seal curing and water swelling ratio were increased by 51.1% and 32. 4 respectively. The expansion stress of mortar increased by 45% for 40 h.
【作者單位】： 高性能土木工程材料國家重點(diǎn)實(shí)驗(yàn)室(江蘇省建筑科學(xué)研究院有限公司);江蘇蘇博特新材料股份有限公司;
【基金】：國家自然科學(xué)基金項(xiàng)目(51408275) 國家“973”計(jì)劃項(xiàng)目(2015CB655105)
【分類號(hào)】：TU528
【正文快照】： 由于水泥水化產(chǎn)生收縮形成拉應(yīng)力,導(dǎo)致混凝土澆筑后極易開裂,從而嚴(yán)重影響了混凝土結(jié)構(gòu)的耐久性[1-2]。利用膨脹劑產(chǎn)生的體積膨脹實(shí)現(xiàn)補(bǔ)償收縮是土木工程中最常用的手 段之一[3-4]。氧化鈣(Ca O)膨脹劑因需水量小、膨脹能大等優(yōu)點(diǎn),是當(dāng)前工程應(yīng)用最廣泛的一類膨脹劑[5-6]。Ca

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