本文選題：C90高強高性能混凝土 + 試驗室基準(zhǔn)配合比　； 參考：《重慶交通大學(xué)》2017年碩士論文

【摘要】：高強高性能混凝土與普通混凝土相比,在工作性、力學(xué)性、耐久性、經(jīng)濟性等方面有著一定的優(yōu)勢。采用高強高性能混凝土可以使結(jié)構(gòu)物體積更小,這樣既能滿足更多特定形狀下的承載力需要,又能合理利用資源、節(jié)約成本,因此,對高強高性能混凝土的研究具有重要意義。本文以C90高強高性能混凝土為研究對象,主要進(jìn)行了原材料選擇、配合比設(shè)計、工作性、力學(xué)性、耐久性、微觀機理等六個方面的工作。首先對C90高強高性能混凝土用原材料進(jìn)行優(yōu)選,在初步計算配合比和試拌試驗的基礎(chǔ)上,通過正交試驗方法選取粉煤灰、礦渣粉、硅灰三種礦物摻合料的最佳摻量,得到試驗室基準(zhǔn)配合比;其次,在試驗室基準(zhǔn)配合比下,通過對比試驗研究了膠凝材料的總量、水膠比、砂率三個因素發(fā)生變化時對混凝土立方體抗壓強度、棱柱體抗壓強度、抗彎拉強度、劈裂抗拉強度、抗壓彈性模量等的影響規(guī)律,其中膠凝材料總量分別為550kg/m~3、600 kg/m~3、650 kg/m~3,水膠比分別為0.20、0.22、0.24,砂率分別為38%、40%、42%。高強混凝土的強度等級是以立方體標(biāo)準(zhǔn)試件的抗壓強度為判定依據(jù),在研究五個力學(xué)性能變化規(guī)律時,試驗提出標(biāo)準(zhǔn)試件和非標(biāo)準(zhǔn)試件之間的尺寸換算系數(shù)。本文所配置的C90高強高性能混凝土滿足抗壓強度要求,并且經(jīng)試驗提出了其他四個力學(xué)性能指標(biāo)與抗壓強度的回歸曲線與方程,得到了五個力學(xué)指標(biāo)之間的換算關(guān)系式。通過抗氯離子滲透試驗、早期抗裂試驗研究所配制的C90高強高性能混凝土的抗?jié)B性能和抗開裂性能�？孤入x子試驗采用電通量法測算C90高強高性能混凝土28d的電通量和抗?jié)B系數(shù),收縮試驗采用接觸法分別測得混凝土硬化后和3d標(biāo)養(yǎng)后的長齡期收縮值,早期抗裂試驗采用平板法研究C90高強高性能混凝土的抗裂性能。通過掃描電鏡技術(shù)(SEM)和X-射線衍射技術(shù)(XRD)分析C90高強高性能混凝土與普通強度混凝土之間的形態(tài)特征和物相的差別,從微觀方面分析了C90高強高性能混凝土性能優(yōu)越的原因。
[Abstract]:Compared with ordinary concrete, high strength and high performance concrete has some advantages in working property, mechanical property, durability, economy and so on. Using high strength and high performance concrete can make the volume of structure smaller, which can not only meet the need of bearing capacity under more specific shape, but also make rational use of resources and save cost. Therefore, the study of high strength and high performance concrete is of great significance. In this paper, the C90 high strength and high performance concrete is taken as the research object. Six aspects of material selection, mix ratio design, workability, mechanics, durability and microscopic mechanism are carried out in this paper. At first, the raw materials for C90 high strength and high performance concrete are selected. On the basis of preliminary calculation of mix ratio and trial mixing test, the optimum amount of three mineral admixtures of fly ash, slag powder and silica fume is selected by orthogonal test method. Secondly, under the laboratory reference mix ratio, the compressive strength of concrete cube and the compressive strength of prism are studied when the total amount of cementing material, the ratio of water to binder and the ratio of sand to sand change. The effects of bending and tensile strength, splitting tensile strength and compressive elastic modulus are studied. The total amount of cementitious material is 3 550kg/m~3600 kg/m~3650 / kg / m ~ (3), the ratio of water to binder is 0.20 ~ 0.22 ~ 0.24, and the sand ratio is 38 ~ 40 ~ 40 ~ 42% respectively. The strength grade of high strength concrete is based on the compressive strength of cubic standard specimens. In the study of five laws of mechanical properties, the size conversion coefficient between standard and non-standard specimens is proposed. The C90 high strength and high performance concrete in this paper meets the requirements of compressive strength, and the regression curves and equations of the other four mechanical performance indexes and compressive strength are put forward through experiments, and the conversion relations between the five mechanical indexes are obtained. The impermeability and cracking resistance of C90 high strength and high performance concrete prepared by early crack resistance test and chloride ion permeation test were studied. The electric flux and impermeability coefficient of C90 high strength and high performance concrete were measured by the electric flux method in the chloride ion resistance test. The shrinkage test was used to measure the long age shrinkage of the concrete after hardening and 3 d standard maintenance, respectively. The crack resistance of C 90 high strength and high performance concrete was studied by plate method in early crack resistance test. The morphological characteristics and phase differences between C90 high strength and high performance concrete and ordinary strength concrete were analyzed by means of scanning electron microscopy (SEM) and X ray diffraction (XRD). The reasons for the superior performance of C90 high strength and high performance concrete were analyzed from the microcosmic point of view.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528

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