本文選題：渠道襯砌　切入點(diǎn)：膨脹混凝土　出處：《西北農(nóng)林科技大學(xué)》2014年碩士論文

【摘要】：在水資源日益匱乏的今天，渠道滲漏損失過(guò)大，渠系水有效利用率偏低成為我國(guó)農(nóng)田灌溉重點(diǎn)關(guān)注的問(wèn)題。使用具有抗裂防滲性能的混凝土材料襯砌，是目前我國(guó)渠道防滲工程的重要措施之一。本文針對(duì)渠道襯砌混凝土，特別是預(yù)制襯砌渠道的填縫砂漿干縮變形大，漏水嚴(yán)重這一長(zhǎng)期困擾灌區(qū)生產(chǎn)的技術(shù)難題，研究補(bǔ)償收縮混凝土的特性，確定符合渠道襯砌要求的補(bǔ)償收縮混凝土配合比，，制定出一套較為精確的渠道襯砌板抗裂防滲方案，替代傳統(tǒng)的砂漿填縫材料。這對(duì)增強(qiáng)渠道工程的耐久性、水資源的節(jié)約以及提高工程的經(jīng)濟(jì)性具有重要意義。 本文主要分三部分進(jìn)行研究，第一部分以混凝土的收縮特性為研究對(duì)象，結(jié)合渠道襯砌板的結(jié)構(gòu)及受力特點(diǎn)，推導(dǎo)出梯形渠道襯砌板收縮量的計(jì)算公式；第二部分以UEA-S膨脹劑、MgO膨脹劑、水膠比三因素為研究對(duì)象，進(jìn)行三元二次旋轉(zhuǎn)正交試驗(yàn)，得到新型補(bǔ)償收縮混凝土的配合比以及限制膨脹率最優(yōu)的摻量組合。第三部分，以具體的渠道襯砌板實(shí)例為研究對(duì)象，以無(wú)縫設(shè)計(jì)理論為基礎(chǔ)，因地制宜，制定出一套適合當(dāng)?shù)貧夂蚣笆┕l件的渠道襯砌板防滲措施。由以上思路，本文的主要研究成果是： （1）根據(jù)熱傳導(dǎo)方程及第三類(lèi)邊界條件，結(jié)合溫度變化規(guī)律，得到渠道襯砌板在環(huán)境溫度影響下的收縮機(jī)理；同理根據(jù)濕度擴(kuò)散方程與邊界條件，得到渠道襯砌板在環(huán)境濕度影響下的收縮機(jī)理。 （2）單摻UEA-S膨脹劑在摻量為12%時(shí)最優(yōu)；當(dāng)UEA-S摻量定為10%時(shí)，MgO摻量3%左右最優(yōu)，即兩者比例為3~3.5時(shí)補(bǔ)償收縮效果最好，且MgO膨脹劑對(duì)后期補(bǔ)償效果明顯。 （3）以UEA-S摻量、MgO摻量及水膠比三因素為研究對(duì)象，進(jìn)行三元二次旋轉(zhuǎn)正交試驗(yàn)，得到各因素對(duì)補(bǔ)償收縮混凝土限制膨脹率影響程度的大小依次為：UEA-S摻量＞水膠比＞MgO摻量。UEA-S與MgO摻量對(duì)限制膨脹率的影響規(guī)律均呈現(xiàn)出先增大后減小的趨勢(shì)。通過(guò)效應(yīng)分析和混凝土力學(xué)性能綜合考慮，最終得到混凝土的最優(yōu)配合比即三因素的最優(yōu)組合為：UEA-S的摻量10%，MgO膨脹劑的摻量3%，水膠比0.55。 (4）利用無(wú)縫設(shè)計(jì)理論，由伸縮縫間距計(jì)算公式可以看出，添加膨脹劑后對(duì)混凝土的綜合溫差有顯著的減小作用，渠道襯砌板的無(wú)縫設(shè)計(jì)需要根據(jù)具體收縮量及膨脹劑的摻量做出特定的設(shè)計(jì)施工方案。
[Abstract]:With the increasing shortage of water resources, the loss of canal leakage is too large and the effective utilization ratio of canal system water is low, which has become the key issue of farmland irrigation in China.It is one of the most important measures to use concrete lining with crack resistance and seepage resistance.In this paper, the characteristics of compensating shrinkage concrete have been studied in view of the technical problem that the cement mortar dry-shrinkage and serious water leakage of canal lining concrete, especially the precast lining channel, have been perplexing the production of irrigation area for a long time.The ratio of compensating shrinkage concrete in accordance with the requirements of channel lining is determined and a set of more accurate anti-crack and anti-seepage scheme of channel lining plate is worked out to replace the traditional mortar filling material.It is of great significance to enhance the durability of channel engineering, save water resources and improve the economy of the project.This paper is mainly divided into three parts. The first part takes the shrinkage characteristic of concrete as the research object and deduces the formula of the shrinkage of the trapezoidal channel lining plate combined with the structure and stress characteristics of the tunnel lining slab.In the second part, taking UEA-S expansion agent and water / binder ratio as the object of study, ternary quadratic rotation orthogonal test is carried out to obtain the mix ratio of new compensating shrinkage concrete and the optimal admixture combination to limit the expansion rate.The third part takes the concrete channel lining board as the research object, takes the seamless design theory as the foundation, according to the local conditions, formulates a set of seepage prevention measures suitable for the local climate and construction conditions.Based on the above ideas, the main research results of this paper are as follows:1) according to the heat conduction equation and the boundary conditions of the third type, combining with the law of temperature change, the shrinkage mechanism of the channel lining plate under the influence of ambient temperature is obtained, and the same principle is obtained according to the humidity diffusion equation and boundary conditions.The shrinkage mechanism of channel lining is obtained under the influence of environmental humidity.(2) when the amount of UEA-S expander is 12, the UEA-S content is about 3%, that is, when the ratio of the two is 3 ~ 3.5, the effect of compensating shrinkage is the best, and the effect of MgO expander is obvious in the later period.(3) taking the three factors of UEA-S content and water / binder ratio as the object of study, the ternary quadratic rotation orthogonal test was carried out.The results show that the influence of different factors on the limited expansion ratio of concrete with compensating shrinkage is in the order of: UEA-S content > water-binder ratio > MgO content. UEA-S and MgO content have a tendency of increasing first and then decreasing.Through the analysis of the effects and the comprehensive consideration of the mechanical properties of concrete, the optimal mix ratio of concrete is obtained, that is, the optimal combination of three factors is the proportion of 10% UEA-S and the amount of MgO expansion agent, and the ratio of water to binder is 0.55.4) by using the theory of seamless design, it can be seen from the formula of expansion joint spacing that the comprehensive temperature difference of concrete can be significantly reduced by adding expansion agent.The seamless design of channel lining need to make a specific design and construction scheme according to the specific shrinkage and expansion agent content.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TV544

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