【摘要】：由于天然砂資源短缺、質(zhì)量下降、價(jià)格上漲，建筑用砂需求量不斷增大，使得機(jī)制砂混凝土在工業(yè)與民用建筑工程、水利水電工程和道路橋梁等工程中的應(yīng)用研究越來越廣泛。然而，石粉對(duì)混凝土性能的影響的研究主要集中在石粉含量方面，而常常忽略了石粉特性之間的差異，石粉特性方面的研究較少且不夠系統(tǒng)。因此研究機(jī)制砂中石粉特性對(duì)機(jī)制砂混凝土性能的影響具有一定的理論意義和重要的實(shí)用價(jià)值。 通過對(duì)不同地區(qū)的機(jī)制砂樣及石粉特性的檢測(cè)與統(tǒng)計(jì)分析，發(fā)現(xiàn)不同地區(qū)生產(chǎn)的機(jī)制砂的粒形、級(jí)配、泥塊含量、石粉特性及含量存在較大差異，并為此探討了機(jī)制砂含泥量的表征方法及限值。研究認(rèn)為，機(jī)制砂干篩石粉的MB值與石粉含量的組合并不能很好地反映機(jī)制砂中含泥情況，而機(jī)制砂MB值與2.36mm通過率、水篩石粉MB值與石粉含量能更好的反映機(jī)制砂中含泥量。 研究了純石粉巖性、細(xì)度以及泥粉種類及摻量對(duì)石粉MB值的影響，研究發(fā)現(xiàn)對(duì)于純石粉，細(xì)度的增加對(duì)MB值影響不大；不同巖性的純石粉的MB值有較大的差異，這與石粉的礦物成分和結(jié)構(gòu)有關(guān)；石粉的MB值隨泥粉摻量的增大而線性遞增，其斜率與泥粉的泥質(zhì)有關(guān)；相比細(xì)度和巖性而言，含泥量對(duì)石粉MB值的影響最為顯著。 研究了不同細(xì)度、巖性及MB值的石粉以10%的比例替代機(jī)制砂時(shí)對(duì)砂漿和C30、C60混凝土的工作性、強(qiáng)度、耐久性能以及體積穩(wěn)定性的影響。研究發(fā)現(xiàn)，石粉細(xì)度和巖性對(duì)低強(qiáng)和高強(qiáng)混凝土性能的影響有不同的規(guī)律，但總體而言，，細(xì)度對(duì)混凝土性能的影響較小，不同巖性石粉對(duì)混凝土性能的影響有較大的差異，MB值對(duì)混凝土性能的影響十分顯著，特別是工作性、抗凍性和體積穩(wěn)定性。對(duì)于含有10%石粉的機(jī)制砂混凝土，C30混凝土對(duì)應(yīng)石粉的MB值不宜超過14，對(duì)于C60混凝土，石粉MB值不宜超過10。對(duì)于大流態(tài)混凝土或抗凍性要求較高的混凝土，石粉中含泥量的控制應(yīng)更嚴(yán)格。 當(dāng)集料中含泥量較高時(shí)，加入一定量的能優(yōu)先吸附在泥粉上的添加劑（如亞甲藍(lán)），能夠改善混凝土工作性，提高減水劑的減水效果和適應(yīng)性，同時(shí)對(duì)混凝土的強(qiáng)度和耐久性等影響較小，甚至有所提高。
[Abstract]:Due to the shortage of natural sand resources, the decline of quality, the rising price and the increasing demand for building sand, the application of machine-made sand concrete in industrial and civil construction projects, water conservancy and hydropower projects and road and bridge projects is becoming more and more extensive. However, the effect of stone powder on concrete performance is mainly focused on the content of stone powder, and the difference between stone powder properties is often ignored. The research on stone powder characteristics is less and less systematic. Therefore, it has certain theoretical significance and important practical value to study the influence of stone powder characteristics in machine-made sand on the properties of machine-made sand concrete. Through the detection and statistical analysis of the characteristics of machine-made sand and stone powder in different areas, it is found that there are great differences in grain shape, gradation, mudblock content, stone powder characteristic and content of machine-made sand produced in different areas. Therefore, the characterization method and limit value of the mud-content of machine-made sand are discussed. The results show that the combination of MB value and stone powder content of the dry sieve stone powder can not well reflect the mud content in the mechanism sand, but the MB value and the 2.36mm pass rate of the machined sand, the MB value and the content of stone powder of the water sieve powder can better reflect the mud content in the machine-made sand. The effects of lithology, fineness, type and content of mud powder on the MB value of stone powder are studied. It is found that the increase of fineness has little effect on the MB value of pure stone powder, and the MB value of pure stone powder with different lithology has great difference. This is related to the mineral composition and structure of stone powder, the MB value of stone powder increases linearly with the increase of the content of mud powder, and its slope is related to the mud quality of mud powder. Compared with fineness and lithology, the influence of mud content on MB value of stone powder is the most significant. The effects of different fineness, lithology and MB value of stone powder on workability, strength, durability and volume stability of mortar and C30C60 concrete were studied. It is found that the influence of stone powder fineness and lithology on the performance of low strength and high strength concrete is different, but in general, the influence of fineness on the performance of concrete is small. The effect of rock powder on concrete performance is quite different. The effect of MB value on concrete performance is very significant, especially the workability, frost resistance and volume stability. The MB value of the concrete containing 10% stone powder should not exceed 14, and the MB value of stone powder should not exceed 10% for the C60 concrete. For large flow concrete or concrete with high frost resistance, the control of mud content in stone powder should be more strict. When the amount of mud in the aggregate is high, adding a certain amount of additives (such as methylene blue) which can preferentially adsorb on the mud powder can improve the workability of concrete and improve the water reducing effect and adaptability of the water-reducing agent. At the same time, the strength and durability of concrete are slightly affected, even improved.
【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】：2014
【分類號(hào)】：TU528

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