纖維礦渣微粉混凝土高溫性能試驗研究
發(fā)布時間：2018-09-04 14:52
【摘要】：通過1232個不同尺寸的纖維礦渣微粉混凝土試件在常溫、高溫中和高溫后力學(xué)性能試驗,并結(jié)合微觀測試及機(jī)理分析,重點探討溫度、礦渣微粉摻量、聚丙烯纖維摻量、鋼纖維體積率和混凝土強(qiáng)度等級對纖維礦渣微粉混凝土力學(xué)性能的影響,主要研究內(nèi)容和結(jié)論如下： 1.進(jìn)行了纖維礦渣微粉混凝土常溫力學(xué)性能試驗研究。結(jié)果表明,礦渣微粉和鋼纖維使纖維礦渣微粉混凝土抗壓強(qiáng)度、劈拉強(qiáng)度和變形、抗折強(qiáng)度和變形均有不同程度提高；聚丙烯纖維對纖維礦渣微粉混凝土抗壓強(qiáng)度、彈性模量和劈拉變形均有不同程度改善；隨混凝土強(qiáng)度等級提高,纖維礦渣微粉混凝土劈拉強(qiáng)度和變形、抗折強(qiáng)度和變形均有不同程度提高。根據(jù)對試驗結(jié)果的統(tǒng)計分析,建立了考慮礦渣微粉摻量、聚丙烯纖維摻量和鋼纖維體積率影響的纖維礦渣微粉混凝土常溫抗壓強(qiáng)度、劈拉強(qiáng)度、抗折強(qiáng)度和彈性模量的計算模型。 2.進(jìn)行了纖維礦渣微粉混凝土高溫后掃描電鏡分析和機(jī)理分析。結(jié)果表明,溫度、礦渣微粉、聚丙烯纖維、鋼纖維和混凝土強(qiáng)度等級對纖維礦渣微粉混凝土燒失率有不同程度影響。隨著溫度升高,纖維礦渣微粉混凝土內(nèi)部水分逐漸蒸發(fā)分解,水泥漿體以及骨料與水泥漿體的界面過渡區(qū)內(nèi)C-S-H凝膠,鈣礬石AFt晶體和氫氧化鈣Ca(OH)2晶體等水泥水化物的形貌、狀態(tài)和數(shù)量以及孔隙與裂縫均發(fā)生了不同程度地變化,其高溫爆裂和微觀組織高溫?fù)p傷發(fā)展過程與其組織內(nèi)部水的分解汽化與遷移過程有關(guān)。 3.進(jìn)行了纖維礦渣微粉混凝土高溫中和高溫后力學(xué)性能試驗研究。結(jié)果表明,高溫作用使纖維礦渣微粉混凝土抗壓強(qiáng)度比、劈拉強(qiáng)度比、抗折強(qiáng)度比和彈性模量比均有不同程度降低。礦渣微粉和聚丙烯纖維摻量變化對纖維礦渣微粉混凝土高溫抗壓強(qiáng)度比、劈拉強(qiáng)度比、抗折強(qiáng)度比和彈性模量比影響較�。浑S鋼纖維體積率增大,纖維礦渣微粉混凝土高溫抗壓強(qiáng)度比、劈拉強(qiáng)度比和抗折強(qiáng)度比有不同程度提高,其中劈拉強(qiáng)度比和抗折強(qiáng)度比的提高幅度較大。對比分析高溫和常溫試驗研究結(jié)果,建立了纖維礦渣微粉混凝土高溫抗壓強(qiáng)度、劈拉強(qiáng)度、抗折強(qiáng)度和彈性模量的計算模型。 4.測試了纖維礦渣微粉混凝土高溫變形性能,系統(tǒng)分析了溫度、礦渣微粉摻量、聚丙烯纖維摻量、鋼纖維體積率和混凝土強(qiáng)度等級對纖維礦渣微粉混凝土抗壓、劈拉和彎曲變形的影響,建立了考慮溫度、礦渣微粉摻量、聚丙烯纖維摻量和鋼纖維體積率影響的纖維礦渣微粉混凝土高溫受壓應(yīng)力-應(yīng)變曲線方程。
[Abstract]:Through the mechanical properties tests of 1232 concrete specimens with fiber slag powder at room temperature, high temperature and high temperature, combined with microscopic test and mechanism analysis, the temperature, the content of slag powder and the content of polypropylene fiber were discussed. The effects of volume ratio of steel fiber and strength grade of concrete on the mechanical properties of fiber slag micro-powder concrete are studied. The main contents and conclusions are as follows: 1. The mechanical properties of fiber slag micro-powder concrete at room temperature were studied. The results show that the compressive strength, splitting tensile strength and deformation, flexural strength and deformation of fiber slag micro-powder concrete can be improved by slag micro-powder and steel fiber, and polypropylene fiber can improve the compressive strength of fiber slag micro-powder concrete. The elastic modulus and split tensile deformation are improved in varying degrees, and with the increase of concrete strength grade, splitting tensile strength and deformation, flexural strength and deformation of fiber slag micro-powder concrete are improved in varying degrees. Based on the statistical analysis of the test results, the compressive strength and splitting tensile strength of concrete with fine powder of slag, polypropylene fiber and volume ratio of steel fiber at room temperature were established. Models for calculating flexural strength and modulus of elasticity. 2. SEM analysis and mechanism analysis of fiber slag micro-powder concrete after high temperature were carried out. The results show that temperature, slag micro-powder, polypropylene fiber, steel fiber and concrete strength grade have different effects on the burning loss rate of fiber slag micro-powder concrete. With the increase of temperature, the internal moisture of fiber slag micro-powder concrete gradually evaporates and decomposes, and the morphology of cement hydrates such as C-S-H gel, ettringite AFt crystal and calcium hydroxide Ca (OH) 2 crystal in the transition zone between cement paste and aggregate and cement paste is obtained. The state and quantity as well as the pore and fracture have changed in different degrees. The process of high temperature burst and microstructure damage at high temperature is related to the water decomposition and vaporization and migration process. The mechanical properties of fiber slag fine powder concrete after high temperature and high temperature were studied. The results show that the compressive strength ratio, splitting tensile strength ratio, flexural strength ratio and elastic modulus ratio of fiber slag micro-powder concrete are decreased by high temperature. The change of slag powder and polypropylene fiber content has little effect on high temperature compressive strength ratio, splitting tensile strength ratio, flexural strength ratio and elastic modulus ratio of fiber slag micro powder concrete. The ratio of high temperature compressive strength, split tensile strength and flexural strength of fiber slag micro-powder concrete has been improved to some extent, and the ratio of splitting tensile strength and flexural strength has been greatly improved. The calculation models of high temperature compressive strength, splitting tensile strength, flexural strength and elastic modulus of fiber slag micro-powder concrete are established by comparing and analyzing the experimental results of high temperature and normal temperature. 4. The deformation properties of fiber slag micro-powder concrete at high temperature were tested. The compression resistance of fiber slag micro-powder concrete was analyzed systematically by temperature, slag powder content, polypropylene fiber content, volume ratio of steel fiber and strength grade of concrete. Under the influence of splitting and bending deformation, the stress-strain curve equation of fiber slag micro-powder concrete under high temperature compression was established considering the influence of temperature, slag powder content, polypropylene fiber content and volume ratio of steel fiber.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU528
本文編號：2222491
[Abstract]:Through the mechanical properties tests of 1232 concrete specimens with fiber slag powder at room temperature, high temperature and high temperature, combined with microscopic test and mechanism analysis, the temperature, the content of slag powder and the content of polypropylene fiber were discussed. The effects of volume ratio of steel fiber and strength grade of concrete on the mechanical properties of fiber slag micro-powder concrete are studied. The main contents and conclusions are as follows: 1. The mechanical properties of fiber slag micro-powder concrete at room temperature were studied. The results show that the compressive strength, splitting tensile strength and deformation, flexural strength and deformation of fiber slag micro-powder concrete can be improved by slag micro-powder and steel fiber, and polypropylene fiber can improve the compressive strength of fiber slag micro-powder concrete. The elastic modulus and split tensile deformation are improved in varying degrees, and with the increase of concrete strength grade, splitting tensile strength and deformation, flexural strength and deformation of fiber slag micro-powder concrete are improved in varying degrees. Based on the statistical analysis of the test results, the compressive strength and splitting tensile strength of concrete with fine powder of slag, polypropylene fiber and volume ratio of steel fiber at room temperature were established. Models for calculating flexural strength and modulus of elasticity. 2. SEM analysis and mechanism analysis of fiber slag micro-powder concrete after high temperature were carried out. The results show that temperature, slag micro-powder, polypropylene fiber, steel fiber and concrete strength grade have different effects on the burning loss rate of fiber slag micro-powder concrete. With the increase of temperature, the internal moisture of fiber slag micro-powder concrete gradually evaporates and decomposes, and the morphology of cement hydrates such as C-S-H gel, ettringite AFt crystal and calcium hydroxide Ca (OH) 2 crystal in the transition zone between cement paste and aggregate and cement paste is obtained. The state and quantity as well as the pore and fracture have changed in different degrees. The process of high temperature burst and microstructure damage at high temperature is related to the water decomposition and vaporization and migration process. The mechanical properties of fiber slag fine powder concrete after high temperature and high temperature were studied. The results show that the compressive strength ratio, splitting tensile strength ratio, flexural strength ratio and elastic modulus ratio of fiber slag micro-powder concrete are decreased by high temperature. The change of slag powder and polypropylene fiber content has little effect on high temperature compressive strength ratio, splitting tensile strength ratio, flexural strength ratio and elastic modulus ratio of fiber slag micro powder concrete. The ratio of high temperature compressive strength, split tensile strength and flexural strength of fiber slag micro-powder concrete has been improved to some extent, and the ratio of splitting tensile strength and flexural strength has been greatly improved. The calculation models of high temperature compressive strength, splitting tensile strength, flexural strength and elastic modulus of fiber slag micro-powder concrete are established by comparing and analyzing the experimental results of high temperature and normal temperature. 4. The deformation properties of fiber slag micro-powder concrete at high temperature were tested. The compression resistance of fiber slag micro-powder concrete was analyzed systematically by temperature, slag powder content, polypropylene fiber content, volume ratio of steel fiber and strength grade of concrete. Under the influence of splitting and bending deformation, the stress-strain curve equation of fiber slag micro-powder concrete under high temperature compression was established considering the influence of temperature, slag powder content, polypropylene fiber content and volume ratio of steel fiber.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU528
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