本文選題：礦物料混凝土 + 高溫水養(yǎng)護(hù)　； 參考：《中國礦業(yè)大學(xué)》2014年碩士論文

【摘要】：本文主要探討早期高溫水養(yǎng)護(hù)對(duì)礦物摻合料混凝土力學(xué)性能和微觀結(jié)構(gòu)的影響。由于早期高溫養(yǎng)護(hù)會(huì)對(duì)混凝土后期性能造成一定隱患，本文采用延長預(yù)養(yǎng)時(shí)間和加入礦物摻合料的方式來進(jìn)行改善，同時(shí)探究水養(yǎng)溫度、預(yù)養(yǎng)強(qiáng)度、配合比類型和放置齡期對(duì)混凝土性能的影響，為現(xiàn)有養(yǎng)護(hù)制度尤其是預(yù)制構(gòu)件的蒸汽養(yǎng)護(hù)提供參考和借鑒，同時(shí)得到礦物料混凝土性能隨養(yǎng)護(hù)條件的變化規(guī)律。 論文首先通過探索試驗(yàn)得到預(yù)養(yǎng)時(shí)間和不同水養(yǎng)溫度下的養(yǎng)護(hù)持續(xù)時(shí)間，以確定基準(zhǔn)養(yǎng)護(hù)制度。然后對(duì)不同配合比混凝土按照基本養(yǎng)護(hù)制度進(jìn)行養(yǎng)護(hù)后測(cè)試不同齡期的抗壓強(qiáng)度和劈裂抗拉強(qiáng)度，根據(jù)力學(xué)實(shí)驗(yàn)結(jié)果選擇試驗(yàn)進(jìn)行微觀結(jié)構(gòu)試驗(yàn)和水化程度試驗(yàn)，探究宏觀力學(xué)性能與微觀結(jié)構(gòu)和粉煤灰水化程度的關(guān)系。 研究主要結(jié)果如下 1.無論是普通混凝土還是摻礦物摻合料混凝土，其早期抗壓強(qiáng)度和抗拉強(qiáng)度隨養(yǎng)護(hù)溫度升高而增大，長期強(qiáng)度同養(yǎng)護(hù)溫度的變化規(guī)律同早期強(qiáng)度正好相反。 2.普通混凝土和摻礦物摻合料混凝土在高溫水養(yǎng)之前都適合進(jìn)行較長時(shí)間的預(yù)養(yǎng)，提高預(yù)養(yǎng)強(qiáng)度可以減少漿體內(nèi)部微裂縫、改善水化產(chǎn)物的微觀形貌并細(xì)化孔結(jié)構(gòu)。 3.無論采用哪種養(yǎng)護(hù)方式，普通混凝土的長期抗壓強(qiáng)度大于礦物混凝土，三摻礦物混凝土在20℃水養(yǎng)28d后長期抗拉強(qiáng)度最大。單摻和雙摻礦物料混凝土可采用高溫養(yǎng)護(hù)，三摻礦物料混凝土和普通硅酸鹽水泥混凝土宜采用標(biāo)準(zhǔn)養(yǎng)護(hù)。 4．高溫養(yǎng)護(hù)時(shí)，混凝土長期抗壓強(qiáng)度沒有隨著齡期延長而回縮，抗拉強(qiáng)度沒有呈現(xiàn)始終增長的趨勢(shì)，20℃~80℃范圍，混凝土的抗拉強(qiáng)度隨放置齡期的增長大約在100d齡期達(dá)到峰值，其后開始出現(xiàn)倒縮，而且早期養(yǎng)護(hù)溫度越高，后期的倒縮程度越大。 5.礦物料水泥體系的微觀結(jié)構(gòu)（孔結(jié)構(gòu)、水化產(chǎn)物形貌）和抗壓強(qiáng)度有著良好的相關(guān)關(guān)系。提高預(yù)養(yǎng)強(qiáng)度后可以有效細(xì)化漿體的孔隙分布和改善水化產(chǎn)物的形貌；養(yǎng)護(hù)溫度提高，礦物料水泥體系長期微觀形貌較差；高預(yù)養(yǎng)后40℃水養(yǎng)護(hù)的粉煤灰水泥體系長期微觀形貌好于標(biāo)準(zhǔn)養(yǎng)護(hù)。 6．粉煤灰水化程度實(shí)驗(yàn)可以得到：預(yù)養(yǎng)強(qiáng)度的提高和早期養(yǎng)護(hù)溫度升高顯著提高粉煤灰水化程度；隨著齡期的延長，每一種配合比的膠凝材料的粉煤灰水化程度呈現(xiàn)增長趨勢(shì)，但增長幅度變小；同時(shí)，，養(yǎng)護(hù)溫度越低，粉煤灰水化程度隨齡期的增長幅度越大，與單摻粉煤灰相比，加入其他礦物料會(huì)降低粉煤灰粉煤灰水化程度。
[Abstract]:This paper mainly discusses the early high temperature water curing on the influence of mineral admixture on mechanical properties and microstructure of concrete. Because of high temperature curing will cause some hidden dangers to the later concrete performance, the extension of pre curing time and adding mineral admixture to improve, and explore the water temperature, pre curing strength, mix type and place the age effect on the properties of concrete, especially for the existing maintenance system and provide reference for steam curing prefabricated, and get the variation properties of mineral aggregate concrete with the curing conditions.
Firstly, through the experiment to obtain the pre curing time and different water temperature curing duration, to determine the base maintenance system. Then the different mixing ratio of concrete in accordance with the basic maintenance system maintenance after testing compressive strength at different ages and splitting tensile strength, according to the experimental results of mechanical test microstructure and hydration test the degree of test, the relationship between macroscopic mechanical properties and microscopic structure and hydration degree of fly ash.
The main results of the study are as follows
1., no matter ordinary concrete or mineral admixture concrete, its early compressive strength and tensile strength increase with the increase of curing temperature. The rule of long-term strength and curing temperature is contrary to that of early strength.
2. ordinary concrete and mineral admixture concrete in hot water for a long time before the pre curing, improve pre curing strength of slurry can reduce internal micro cracks, improve the hydration products and microstructure refinement of the pore structure.
3. no matter what kind of curing method, long-term compressive strength of ordinary concrete is greater than 20 degrees in the concrete mineral, water 28d after long-term tensile strength of three mineral concrete. Single or double doped mineral material concrete can be made of high temperature curing, three mineral aggregate concrete and Portland cement concrete should be used in standard curing.
4. high temperature curing, long-term compressive strength of concrete with no age extension and retraction, the tensile strength has always increased, 20 DEG ~80 DEG range, the tensile strength of concrete with the age of about 100D age peak, then began to fall down, and early maintenance of higher temperature the retraction is greater.
The microstructure of 5. mineral material cement system (pore structure, hydration products morphology and compressive strength) have good correlation. To improve the pre curing strength can effectively refine paste pore distribution and improve the morphology of hydration products; improve the curing temperature, mineral material cement system long term microstructure is poor; high pre after a 40 DEG C water curing fly ash cement system long-term morphology was better than the standard maintenance.
6. fly ash hydration experiments can be obtained: pre curing strength increase and early curing temperature significantly improve the hydration degree of fly ash; with increasing age, each with the cementitious material than the hydration degree of fly ash increased, but the growth rate decreases; at the same time, curing temperature is low degree of hydration of fly ash with age range is larger, compared with single fly ash, adding other mineral materials will reduce the hydration degree of fly ash.

【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 鄭克仁,孫偉,賈艷濤,郭麗萍;水泥-礦渣-粉煤灰體系中礦渣和粉煤灰反應(yīng)程度測(cè)定方法[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2004年03期

2 方光秀,李發(fā)千,鄭文忠;混凝土成熟度新論及新成熟度準(zhǔn)則應(yīng)用[J];低溫建筑技術(shù);2002年02期

3 王彩英;;礦渣微粉-粉煤灰復(fù)合灰混凝土微觀孔結(jié)構(gòu)以及形貌分析[J];粉煤灰;2008年06期

4 馬保國;王迎斌;羅忠濤;李相國;黃祥;;堿性環(huán)境下粉煤灰活性的溫度效應(yīng)研究[J];粉煤灰綜合利用;2009年05期

5 林震,陳益民,蘇姣華,郭隨華,張文生,張洪滔;外摻磨細(xì)礦渣與粉煤灰的水泥基材料的亞微結(jié)構(gòu)研究[J];硅酸鹽學(xué)報(bào);2000年S1期

6 賈耀東;閻培渝;;粉煤灰中SiO_2在不同堿性條件下的溶出量及與火山灰活性指數(shù)的關(guān)系[J];硅酸鹽學(xué)報(bào);2009年07期

7 董俊順;蒸汽養(yǎng)護(hù)砼構(gòu)件強(qiáng)度的損失及預(yù)防對(duì)策[J];當(dāng)代建設(shè);2001年05期

8 張子明,周紅軍,趙吉坤;溫度對(duì)混凝土強(qiáng)度的影響[J];河海大學(xué)學(xué)報(bào)(自然科學(xué)版);2004年06期

9 魯文斌;;復(fù)摻粉煤灰和硅灰在自密實(shí)混凝土中的應(yīng)用[J];混凝土;2009年08期

10 王鵬;李果;陸恩麗;耿歐;姬永生;;初期養(yǎng)護(hù)對(duì)水泥-粉煤灰體系粉煤灰水化度的影響[J];混凝土;2011年01期

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