本文選題：復(fù)合型養(yǎng)護劑　切入點：力學(xué)性能　出處：《長安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：充分合理的養(yǎng)護是提高混凝土耐久性的有效手段，養(yǎng)護劑養(yǎng)護作為一種新型養(yǎng)護方式具有高效、便捷、適應(yīng)性強等諸多優(yōu)點而受到越來越多的關(guān)注。但目前國內(nèi)所研制的養(yǎng)護劑大多存在著養(yǎng)護機理單一、保水率低的缺點，且對養(yǎng)護劑的性能研究也僅局限于混凝土的力學(xué)及耐久性能，而針對養(yǎng)護劑的養(yǎng)護效果評價以及養(yǎng)護劑的微觀作用機理研究較少。因此，研制一種高效多功能的復(fù)合型養(yǎng)護劑并開展相應(yīng)研究具有重要意義。 本文從養(yǎng)護劑各組成材料的作用機理出發(fā)，利用正交試驗，系統(tǒng)分析了有機成膜組分、無機增密組分、改進(jìn)組分對水泥砂漿保水性能及強度的影響，給出了復(fù)合型養(yǎng)護劑的最優(yōu)配比，并對比研究了復(fù)合型養(yǎng)護劑與不同養(yǎng)護方式、不同種類養(yǎng)護劑對混凝土保水性能、力學(xué)性能、粘結(jié)性能、耐久性能的影響，同時利用表面吸水率法以及基于回彈強度的養(yǎng)護效率指數(shù)法對復(fù)合型養(yǎng)護劑的養(yǎng)護效果進(jìn)行評價，最終通過XRD和SEM微觀分析方法研究了養(yǎng)護劑的微觀作用機理。 研究結(jié)果表明：（1）以石蠟乳液為基礎(chǔ)，復(fù)摻純丙乳液、硅酸鈉、三乙醇胺以及甲基硅醇鈉，能夠形成良好的有機/有機、有機/無機復(fù)合體系，發(fā)揮各組分的協(xié)同效應(yīng)提高所制備的復(fù)合型養(yǎng)護劑的性能，3d有效保水率接近80%，28d抗壓強度比達(dá)到95.5%。（2）復(fù)合型養(yǎng)護劑養(yǎng)護的混凝土試件其各齡期的抗壓抗折強度均高于干燥養(yǎng)護對比試件，接近標(biāo)準(zhǔn)養(yǎng)護且略高于灑水養(yǎng)護。（3）復(fù)合型養(yǎng)護劑保水性能優(yōu)于單一型養(yǎng)護劑，不同類型養(yǎng)護劑的性能差異較大，養(yǎng)護劑的最佳噴涂量應(yīng)控制在250~300g/m2。（4）復(fù)合型養(yǎng)護劑克服了石蠟乳液對后澆混凝土粘結(jié)性能的影響，劈裂抗拉強度僅比一次性成型的標(biāo)準(zhǔn)養(yǎng)護試件低了0.27MPa。（5）復(fù)合型養(yǎng)護劑能夠有效降低混凝土試件的干燥收縮，以及提高混凝土的抗?jié)B、抗裂、耐磨性能，其中混凝土7d的干縮值降低了41.1%，28d滲水高度比為85.9%，3d裂紋數(shù)量和面積均低于干燥養(yǎng)護對比試件，裂紋降低率0.987，300g/m2噴涂量下混凝土磨耗量僅為1.96kg/m2。（6）表面吸水率法和養(yǎng)護效率指數(shù)CEI可以較好評價養(yǎng)護方法的養(yǎng)護效果，復(fù)合型養(yǎng)護劑養(yǎng)護試件3d表面吸水率為3.4×10-6cm2/s，，比對比試樣降低了39.2%，養(yǎng)護齡期內(nèi)養(yǎng)護劑養(yǎng)護試件CEI都大于干燥養(yǎng)護。（7）XRD和SEM結(jié)果顯示復(fù)合型養(yǎng)護劑能夠促進(jìn)水泥的水化進(jìn)程生成更多的水化產(chǎn)物，結(jié)晶粒徑也更為粗大，且相互搭接形成密實結(jié)構(gòu)。
[Abstract]:Adequate and reasonable curing is an effective means to improve the durability of concrete. As a new type of curing method, curing agent has high efficiency and convenience. Many advantages, such as strong adaptability, have attracted more and more attention. However, most of the curing agents developed in China have the disadvantages of single curing mechanism and low water retention rate. The performance of curing agent is limited to the mechanics and durability of concrete, but the evaluation of curing effect of curing agent and the microscopic mechanism of curing agent are few. It is of great significance to develop a compound curing agent with high efficiency and multi-function. Based on the action mechanism of curing agents, the effects of organic film forming components, inorganic thickening components and improved components on the water retention properties and strength of cement mortar were systematically analyzed by orthogonal test. The optimum ratio of compound curing agent is given, and the effects of compound curing agent and different curing ways, different curing agents on water retention, mechanical property, bond property and durability of concrete are compared. At the same time, the surface water absorption method and the curing efficiency index method based on springback strength were used to evaluate the curing effect of compound curing agent. Finally, the microcosmic mechanism of curing agent was studied by XRD and SEM microanalysis method. The results show that on the basis of paraffin emulsion, mixed with pure acrylic emulsion, sodium silicate, triethanolamine and sodium methylsilyl, a good organic / organic, organic / inorganic composite system can be formed. Exerting the synergistic effect of each component to improve the performance of the prepared compound curing agent the compressive strength ratio of concrete specimens cured with compound curing agent is higher than that of concrete specimens cured with compound curing agent in different ages. The effective water retention rate of 3 days is close to that of 80 and 28 days and the compressive strength ratio reaches 95.55.2.The concrete specimens cured with compound curing agents have higher compressive and flexural strength at different ages. Dry curing contrast specimen, The water retention performance of compound curing agent is better than that of single curing agent, and the performance of different curing agent is quite different. The optimum spraying amount of curing agent should be controlled at 250 ~ 300g / m ~ (2. 4)) compound curing agent can overcome the influence of paraffin emulsion on the bond property of post-cast concrete. The splitting tensile strength is only 0.27MPa. 5 lower than that of the one-off standard curing specimen. The composite curing agent can effectively reduce the dry shrinkage of concrete specimen and improve the impermeability, crack resistance and wear resistance of concrete. Among them, the dry shrinkage value of concrete for 7 days decreased by 41.1% and 28d water penetration height ratio was 85.9 days, the number and area of cracks were lower than those of dry curing specimens. The surface water absorption method and the maintenance efficiency index (CEI) can be used to evaluate the curing effect of the curing method. The crack reduction rate of 0.987g / m ~ 2 is only 1.96 kg / m ~ (2) for the sprayed concrete, and the surface water absorption method and the maintenance efficiency index (CEI) can be used to evaluate the curing effect of the method. The surface water absorbency of the composite curing sample was 3.4 脳 10 ~ (-6) cm ~ (-2) / s, which was 39.2% lower than that of the control sample. The CEI of the curing sample during curing period was higher than that of the dry curing sample. The results of SEM and SEM showed that the compound curing agent could promote the hydration of cement. Cheng Sheng became more hydrated products, The crystal size is also more coarse and overlapped with each other to form a dense structure.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU755.7

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