【摘要】：隨著經(jīng)濟的發(fā)展和材料科學的進步,混凝土憑著其不可取代的優(yōu)越性,已成為當今世界用量最大的人造材料,是土木建筑工程用材的主體。為了適應(yīng)現(xiàn)代土木建筑工程的(超)高層化、(超)大跨化、(超)耐久化、重載化、抗震防災(zāi)和承受惡劣環(huán)境條件的要求或需要,混凝土正朝著“綠色”、“(超)高強高性能”和“可持續(xù)”的方向發(fā)展。目前,除了混凝土的四大組分—水泥、水、砂和石之外,在混凝土中摻入活性礦物摻合料和高效減水劑及其它外加劑制備高強高性能混凝土已經(jīng)成為最常用的通用技術(shù)途徑,以往的混凝土配合比設(shè)計方法卻已不再適用。因此,對高強高性能混凝土的配合比設(shè)計方法的研究具有重要的學術(shù)意義、廣泛的工程應(yīng)用價值。確定高強高性能混凝土的配合比時,不僅要考慮實際工程對其的各種性能要求,還要考慮材料的選擇、材料相互之間的相容性或協(xié)同性及其最優(yōu)配置。本論文結(jié)合國家自然科學基金項目—型鋼混凝土組合結(jié)構(gòu)的材料-結(jié)構(gòu)一體化多目標優(yōu)化設(shè)計理論與方法研究(50978218),著眼于原材料本身,采用試驗和理論相結(jié)合的方法,融入優(yōu)化概念,不僅研究了聚羧酸系高性能減水劑用于混凝土時與水泥的相容性評價,還研究了集料尺寸及其級配、粉煤灰和硅灰對混凝土性能的影響并進行機理分析,建立其與混凝土強度之間的數(shù)學模型,最終形成一套基于比強度的高強高性能混凝土配合比優(yōu)化設(shè)計方法。主要進行的研究有：1.增加表征水泥與減水劑相容性的參數(shù)或指標—凝結(jié)時間和泌水率,基于Matlab平臺建立隸屬度,打破基準減水劑的局限,建立模糊評判模型對聚羧酸系高性能減水劑與水泥的相容性進行綜合性評價。2.通過研究集料的品質(zhì)及性能對混凝土性能的影響,建立了一套基于Bolomey等式的集料連續(xù)級配最佳組合的數(shù)值求法；建立了砂石顆�；诩壟涞钠骄接嬎愎�,通過試驗和理論研究得出水泥砂漿漿體體積與集料平均粒徑之間存在著一定的相關(guān)性,并明確給出它們之間的函數(shù)關(guān)系,利用該關(guān)系可以進行滿足不同和易性要求的混凝土配合比的定量調(diào)整。3.基于試驗,研究了粉煤灰、硅灰對混凝土性能的影響并進行機理分析,提出并確定了等效水膠比的數(shù)學模型；提出并建立了單摻或雙摻硅灰和(或)粉煤灰的活性指標評價模型,建立了其隨摻量(之比)的一般變化規(guī)律的數(shù)學模型和混凝土強度絕對值的預(yù)測模型。4. 經(jīng)過對普遍采用的不同混凝土配合比設(shè)計方法的考察,取長補短,基于各原材料對混凝土性能影響的研究,建立了一套基于比強度、適用于高強高性能混凝土配合比的優(yōu)化設(shè)計方法
[Abstract]:With the development of economy and the progress of material science, concrete has become the most widely used artificial material in the world and the main body of civil engineering materials because of its irreplaceable advantages. In order to meet the requirements or needs of (super) high-rise, (super) long-span, (super) durability, heavy load, seismic and disaster prevention and bearing harsh environmental conditions, concrete is developing in the direction of "green", "super high strength and high performance" and "sustainable". At present, in addition to the four components of concrete-cement, water, sand and stone, the preparation of high strength and high performance concrete by adding active mineral admixture, superplasticizer and other admixtures has become the most commonly used technical way, but the previous concrete mix proportion design method is no longer applicable. Therefore, the research on the mix proportion design method of high strength and high performance concrete has important academic significance and extensive engineering application value. When determining the mix proportion of high strength and high performance concrete, we should not only consider all kinds of performance requirements of practical engineering, but also consider the selection of materials, the compatibility or synergy of materials with each other and their optimal configuration. Based on the research on the theory and method of material-structure integration multi-objective optimization design of steel reinforced concrete composite structure project of National Natural Science Foundation of China (50978218), this paper focuses on the raw material itself, adopts the method of combining test and theory, and integrates the optimization concept. It not only studies the compatibility evaluation of polycarboxylic acid series high performance water reducer when it is used in concrete, but also studies the aggregate size and its gradation. The influence of fly ash and silica fume on the performance of concrete is analyzed and the mathematical model between fly ash and silica fume and concrete strength is established. Finally, a set of high strength and high performance concrete mix proportion optimization design method based on specific strength is formed. The main studies carried out are as follows: 1. By adding the parameters or indexes to characterize the compatibility of cement and water reducer-setting time and bleeding rate, the membership degree is established based on Matlab platform, the limitation of reference water reducer is broken, and the fuzzy evaluation model is established to comprehensively evaluate the compatibility of polycarboxylic acid series high performance water reducer with cement. 2. By studying the influence of aggregate quality and performance on concrete performance, a set of numerical method for calculating the optimal combination of aggregate continuous gradation based on Bolomey equation is established. The formula for calculating the average particle size of sand and stone particles based on gradation is established. Through experimental and theoretical research, it is concluded that there is a certain correlation between the volume of cement mortar paste and the average particle size of aggregate, and the functional relationship between them is clearly given, which can be used to quantitatively adjust the mix proportion of concrete to meet different and easy requirements. Based on the test, the influence of fly ash and silica fume on the performance of concrete is studied and the mechanism analysis is carried out, and the mathematical model of equivalent water-glue ratio is put forward and determined, and the evaluation model of activity index of single or double mixed silica fume and / or fly ash is put forward and established, and the mathematical model of its general variation with the ratio of silica fume and / or fly ash and the prediction model of absolute value of concrete strength are established. Based on the study of the influence of each raw material on the performance of concrete, a set of optimal design method based on specific strength, which is suitable for high strength and high performance concrete, is established through the investigation of different concrete mix proportion design methods which are widely used in high strength and high performance concrete.
【學位授予單位】：西安建筑科技大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU528

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