發(fā)布時(shí)間：2018-03-20 08:22

  本文選題：礦粉　切入點(diǎn)：水泥　出處：《武漢理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：目前礦渣微粉在水泥基材料中已得到廣泛應(yīng)用,但其等量替代水泥的摻量一般在30wt%以內(nèi)。提高礦渣微粉在水泥基材料中的摻量,了解高摻量礦渣微粉水泥基材料的基本性能,尤其是長(zhǎng)期力學(xué)性能與耐久性,對(duì)于提高礦渣利用率、減少水泥消耗量而保護(hù)生態(tài)環(huán)境具有重要意義。本文以武鋼的高性能礦渣微粉(以下簡(jiǎn)稱為礦粉)、42.5普通硅酸鹽水泥為對(duì)象,研究了不同摻量(10wt%-90wt%,等量取代水泥)的礦粉對(duì)水泥基本性能影響規(guī)律;在此基礎(chǔ)上,采用不同摻量(30 wt%、40 wt%、50 wt%和60 wt%)的礦粉制備了C40大流態(tài)混凝土,研究了其工作性能、長(zhǎng)期力學(xué)性能與耐久性,取得的主要結(jié)論如下:(1)以水泥為基準(zhǔn)樣,隨著礦粉摻量在10wt%-90wt%范圍內(nèi)逐步遞增時(shí),水泥標(biāo)準(zhǔn)稠度需水量逐漸降低,最大降幅為14.3%;凝結(jié)時(shí)間則逐步延長(zhǎng),最大延長(zhǎng)62.5%;砂漿流動(dòng)度逐步增大,最大增幅為10.4%。當(dāng)?shù)V粉摻量分別在40wt%以內(nèi)與50wt%-70wt%時(shí),水泥膠砂的28d強(qiáng)度分別能滿足42.5與32.5普通硅酸鹽水泥的強(qiáng)度要求。(2)以不摻礦粉的C40大流態(tài)混凝土為對(duì)比,隨著礦粉摻量在30wt%-60wt%范圍內(nèi)遞增時(shí),混凝土的坍落度增大(最大增幅23.0%),坍落度經(jīng)時(shí)損失降低(最大降幅(1h)11.2%);抗壓強(qiáng)度增長(zhǎng)率在28d齡期內(nèi)是降低的,而在60d齡期后則逐步增大,其中在礦粉摻量40wt%時(shí),90d與180d齡期的強(qiáng)度已超過(guò)基準(zhǔn)樣;各齡期的抗折強(qiáng)度則呈遞增的趨勢(shì),其中礦粉摻量40wt%的增幅最大。(3)隨著礦粉摻量的增大,混凝土的干燥收縮率增大,尤其是在大摻量、早齡期條件下;混凝土的電通量逐步降低,表明其抗氯離子滲透性能隨礦粉摻量的增加而增強(qiáng);混凝土的凍融循環(huán)質(zhì)量損失增大、相對(duì)彈性模量降低,表明混凝土的抗凍性隨礦粉摻量的增加而降低。綜上所述,礦粉在水泥基材料中的摻量可以提高到40wt%,水泥與混凝土的各項(xiàng)性能整體上較優(yōu),并可以通過(guò)不斷調(diào)整礦粉在水泥中的摻量滿足不同強(qiáng)度的水泥混凝土需求。
[Abstract]:At present, slag micro-powder has been widely used in cement based materials, but its equal amount of substitution cement is generally less than 30wt%. The basic properties of cement based materials with high content of slag micro-powder can be understood by increasing the content of slag micro-powder in cement base materials. In particular, the long-term mechanical properties and durability can improve the utilization ratio of slag. It is of great significance to reduce cement consumption and protect ecological environment. On the basis of the study on the effect of mineral powder with different dosage of 10wt- 90 wtand) on the basic properties of the cement, C40 large-flow concrete was prepared by using the mineral powder with different dosage of 30 wttand 40 wtt% and 60wtttmeter respectively, and its working properties were studied. For long-term mechanical properties and durability, the main conclusions obtained are as follows: (1) taking cement as a reference sample, with the increase of mineral powder content in the range of 10 wt-90 wt%, the water requirement of cement standard consistency decreases gradually, the maximum decrease is 14.3wt%, and the setting time is gradually prolonged. The maximum prolongation is 62.5 and the flow degree of the mortar increases gradually, with the maximum increase of 10.40.When the mineral powder content is within 40wt% and 50wt% and 70wt% respectively, The 28d strength of cement sand can meet the strength requirements of 42.5 and 32.5 ordinary Portland cement respectively. The slump of concrete is increased (the maximum increase is 23.0%, the slump loss decreases (the biggest drop is 1 h), the compressive strength growth rate decreases during 28 d, but increases gradually after 60 d age, the increase of compressive strength increases gradually after the age of 60 days, and the increase of compressive strength increases gradually after the age of 60 days, but the increase of compressive strength increases gradually after the age of 60 days. The strength of 90 days and 180 days of age is higher than that of the standard sample, and the flexural strength of each age shows an increasing trend, in which the increase of 40 wt% of mineral powder is the biggest. 3) with the increase of mineral powder content, the drying shrinkage rate of concrete increases, and the dry shrinkage of concrete increases with the increase of mineral powder content. Especially under the condition of large dosage and early age, the electric flux of concrete decreases gradually, which indicates that the resistance to chloride ion permeability increases with the increase of mineral powder content, and the mass loss of freeze-thaw cycle increases and the relative elastic modulus decreases. The results show that the frost resistance of concrete decreases with the increase of mineral powder content. In conclusion, the content of mineral powder in cement based materials can be increased to 40 wt.The properties of cement and concrete are better as a whole. The cement concrete needs of different strength can be satisfied by continuously adjusting the amount of mineral powder in cement.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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本文編號(hào)：1638263