本文關(guān)鍵詞： 聚合物水泥復(fù)合材料 粘結(jié)強度 粘結(jié)性能 粘結(jié)機理 薄弱幅度 薄弱指數(shù) 粘結(jié)界面模型　出處：《湖南大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：聚合物乳液或膠粉摻入新拌和普通混凝土、砂漿或水泥凈漿,亦可復(fù)摻外加劑或礦物摻合料,可使普通混凝土、砂漿或水泥凈漿性質(zhì)較大地改變,性能顯著地改善,其制成的復(fù)合材料用作粘結(jié)材料,稱為聚合物改性水泥基粘結(jié)復(fù)合材料(Polymer-modified cement-based bonding composite,簡稱PCBC)。本文以丁苯PCBC為重點,對幾類PCBC粘結(jié)性能進行系統(tǒng)的試驗研究和理論分析,其主要內(nèi)容和創(chuàng)新成果如下： 1.基于系統(tǒng)的配比試驗,提出了聚合物改性水泥基粘結(jié)砂漿(Polymer-modified cement-based bonding mortar,簡稱PCBM)較適宜的配比,研究幾類PCBM短期粘結(jié)性能。通過試驗和理論分析可得：(1)聚灰比、水灰比、膠砂比等聚合物砂漿配合比的變化明顯地改變包括粘結(jié)強度在內(nèi)的砂漿強度；高效減水劑等外加劑的復(fù)合改性,顯著地改善部分聚合物砂漿早期粘結(jié)性能；UEA和SF等礦物摻合料對聚合物砂漿早期粘結(jié)性能的改性作用效果不明顯；混用外加劑FDN及礦物摻合料SF和UEA對各種聚合物砂漿粘結(jié)改善作用差異較大。(2)幾乎所有試驗涉及的PCBM,硬化前的拌合物都有特殊的性質(zhì)和特點,硬化后的也有獨特的力學(xué)性能,明顯地區(qū)別于普通砂漿,在選用適當?shù)呐浔群捅３至己玫酿B(yǎng)護環(huán)境等條件下,可以顯著改善早期粘結(jié)性能。 2.將聚合物砂漿的拌合物稠度和密度、粘結(jié)養(yǎng)護制度、配比、外加劑、礦物摻合料、粘結(jié)強度、本體抗壓和抗折強度以及戶外5a齡期粘結(jié),有機地融入聚合物改性水泥基粘結(jié)復(fù)合材料短期和長期粘結(jié)性能研究中,形成了較系統(tǒng)的粘結(jié)性能研究體系,得到如下新型粘結(jié)材料：粘結(jié)性能優(yōu)良的丁苯砂漿,不同粘結(jié)性能的丙烯酸、純丙和氯丁砂漿,潮濕環(huán)境及水中可固化的液態(tài)環(huán)氧樹脂,沒有緩凝現(xiàn)象且本體強度不降低的NP砂漿。 3.通過試驗研究了丁苯改性水泥基材料長期粘結(jié)性能復(fù)雜的作用機理。結(jié)果表明：丁苯水泥凈漿斜剪、直剪、抗彎、軸向拉伸及丁苯混凝土劈裂強度性能優(yōu)越,其抵抗大面積、大體積混凝土修補加固所產(chǎn)生的復(fù)雜應(yīng)力系統(tǒng)破壞的能力突出；丁苯砂漿的長期水泥水化程度較高和其特有的、有益的水泥水化規(guī)律相關(guān)；丁苯砂漿受熱和干縮變形規(guī)律不損害其長期粘結(jié)性能,有些變形甚至對長期粘結(jié)性能有益；丁苯砂漿的粘結(jié)界面電鏡照片和顯微硬度試驗結(jié)果顯示其粘結(jié)效果良好,與其宏觀良好的長期粘結(jié)性能相一致。提出并運用了薄弱幅度和薄弱指數(shù)兩個性能參數(shù),對丁苯砂漿粘結(jié)界面顯微硬度試驗結(jié)果進行分析,進一步證實丁苯砂漿具有良好的長期界面粘結(jié)質(zhì)量,推證了其粘結(jié)界面過渡區(qū)具有自我完善的功能,動態(tài)地解釋了其長期粘結(jié)性能機理。提出并運用了丁苯砂漿粘結(jié)界面模型。
[Abstract]:The properties of ordinary concrete, mortar or cement paste can be changed greatly by adding polymer emulsion or rubber powder into new mixing ordinary concrete, mortar or cement paste, or by adding admixture or mineral admixture. The properties of the composites were significantly improved and the composites were used as bonding materials. It is called Polymer modified cement-based bonding composite. In this paper, the bond properties of several kinds of PCBC are systematically studied and theoretically analyzed, focusing on the butylbenzene PCBC. The main contents and innovative results are as follows: 1. The proportion test based on the system. Polymer-modified cement-based bonding mortar was proposed. In this paper, the short term bond properties of several kinds of PCBM are studied. Through the experiment and theoretical analysis, the ratio of polymer to cement and water to cement can be obtained. The change of polymer mortar mixture ratio, such as cement-sand ratio, obviously changes the strength of mortar, including the bond strength. The composite modification of superplasticizer and other admixtures significantly improved the early bonding property of some polymer mortar. The effect of mineral admixtures such as UEA and SF on the early adhesive properties of polymer mortar is not obvious. The effect of mixed admixture FDN and mineral admixture SF and UEA on the bond improvement of various polymer mortar is quite different. The mixture before hardening has special properties and characteristics, and after hardening, it also has unique mechanical properties, which is obviously different from ordinary mortar, under the conditions of choosing proper proportion and maintaining good maintenance environment and so on. The early bonding property can be significantly improved. 2. Consistency and density of polymer mortar, curing system, ratio, admixture, mineral admixture, bond strength, bulk compressive and flexural strength, and outdoor 5a age bond. Organically incorporated into the short-term and long-term bond properties of polymer modified cement based bonded composites, a more systematic bond performance research system has been formed. The following new adhesive materials were obtained: butadiene mortar with good bond properties acrylic acid with different bond properties pure propylene and chloroprene mortar liquid epoxy resin which can be cured in wet environment and water. NP mortar with no retarding phenomenon and no decrease in bulk strength. 3. The mechanism of complex long-term bond properties of SBR modified cement-based materials was studied. The results showed that the slanting shear, direct shear and bending resistance of butadiene cement paste were studied. Axial tensile and butadiene-butadiene concrete have excellent strength properties, and its ability to resist the failure of complex stress system caused by large area and mass concrete repair and reinforcement is outstanding. The degree of long-term cement hydration of benzene butadiene mortar is higher than that of benzene butadiene mortar, which is related to its unique and beneficial cement hydration law. The behavior of thermal and dry shrinkage deformation of butadiene mortar does not damage its long-term bond performance, and some deformation is even beneficial to the long-term bond property. The results of SEM and microhardness test show that the bonding effect of SBR mortar is good. The results of microhardness test on the bond interface of benzene butadiene mortar were analyzed by using two performance parameters, the weak range and the weak index. It is further proved that butadiene mortar has good long-term interfacial bond quality, and the self-improvement function of the bond interface transition zone is inferred. The mechanism of long-term bond performance is explained dynamically. A model of the bond interface of butadiene mortar is proposed and applied.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU528

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