【摘要】：隨著“綠色混凝土”概念的提出,再生混凝土受到越來(lái)越多的關(guān)注。但由于再生骨料特性上的不足,導(dǎo)致所制備出的再生混凝土性能不佳,因此,研究如何制備出特性良好的再生骨料及提高再生混凝土的各方面性能具有重要的意義。本文研究了全再生骨料混凝土高性能化的主要途徑,研究了粉煤灰和礦粉單、復(fù)摻對(duì)全再生骨料混凝土的基本性能的影響,同時(shí)探討了全再生骨料混凝土多次循環(huán)利用的可能性。結(jié)果表明： 1、將簡(jiǎn)單破碎得到的再生骨料經(jīng)過(guò)機(jī)械強(qiáng)化處理,可有效提高再生骨料品質(zhì),吸水率、表觀密度、堆積密度、壓碎指標(biāo)以及顆粒級(jí)配等各方面性能均得到一定的改善。 2、在相同配合比的情況下,全再生骨料混凝土抗壓強(qiáng)度、抗氯離子滲透性能略低于普通混凝土,摻入礦物摻合料可提高全再生骨料混凝土的抗壓強(qiáng)度和抗氯離子滲透性能；礦物摻合料的形態(tài)效應(yīng)、微集料效應(yīng)和火山灰效應(yīng)是改善全再生骨料混凝土性能的主要因素。 3、單摻粉煤灰、礦粉均降低全再生骨料混凝土的7d抗壓強(qiáng)度,相同摻量時(shí),摻有粉煤灰的全再生骨料混凝土早期強(qiáng)度下降更為明顯；在摻量小于40%時(shí),粉煤灰、礦粉的摻入能提高全再生骨料混凝土的90d抗壓強(qiáng)度,且摻量越大,提高越明顯；復(fù)摻粉煤灰和礦粉的效果要優(yōu)于單摻同等摻量的粉煤灰或者礦粉。 4、當(dāng)復(fù)摻總量一定時(shí),粉煤灰與礦粉摻入的不同比例(1：3、1：1、3：1)對(duì)全再生骨料混凝土7d抗壓強(qiáng)度有一定影響,表現(xiàn)為粉煤灰含量高的再生混凝土的7d抗壓強(qiáng)度較高,但對(duì)全再生骨料混凝土90d抗壓強(qiáng)度影響不大。 5、全再生骨料混凝土的抗氯離子滲透性能同樣受到粉煤灰和礦粉摻量的影響,摻量越大,抗氯離子滲透性能提高越明顯,但對(duì)全再生骨料混凝土的抗碳化性能起到反作用,綜合考慮抗壓強(qiáng)度、抗氯離子滲透性能及抗碳化性能,建議高性能化方案選擇復(fù)摻粉煤灰和礦粉,且摻量均為20%。 6、火山灰效應(yīng)數(shù)值分析能夠?qū)⒌V物摻合料對(duì)全再生骨料混凝土強(qiáng)度的貢獻(xiàn)值量化,準(zhǔn)確地反映出不同礦物摻合料在全再生骨料混凝土的不同齡期對(duì)其各項(xiàng)性能的影響規(guī)律,且和分析試驗(yàn)實(shí)測(cè)值所得的結(jié)論一致。7、灰色關(guān)聯(lián)度分析能定量描述出粉煤灰、礦粉對(duì)全再生骨料混凝土性能影響的動(dòng)態(tài)過(guò)程,通過(guò)關(guān)聯(lián)度比較得知礦物摻合料的總摻量是各項(xiàng)性能的最大影響因子,而抗壓強(qiáng)度的次級(jí)影響因子為礦粉摻量,抗氯離子滲透性能的次級(jí)影響因子為粉煤灰摻量。 8、礦物摻合料可以大幅降低全再生骨料混凝土中孔徑為100-1000nm之間的孔體積百分?jǐn)?shù),細(xì)化再生混凝土孔隙,提高其密實(shí)性。 9、二次全再生混凝土較一次全再生混凝土在抗壓強(qiáng)度和抗氯離子滲透性方面性能均有一定程度下降,抗壓強(qiáng)度下降幅度約為15%,電通量上升幅度在10%～30%之間,在不改變配合比的情況下再生混凝土的再循環(huán)的次數(shù)是有限的。
[Abstract]:With the introduction of the "green concrete" concept, more and more attention has been paid to the recycled concrete. However, it is of great significance to study how to prepare regenerated aggregates with good characteristics and to improve the performance of recycled concrete because of the insufficient properties of recycled aggregate. In this paper, the main ways of high-performance of full-regenerative aggregate concrete are studied, and the effect of fly ash and mineral powder single and complex admixture on the basic properties of fully-regenerated aggregate concrete is studied, and the possibility of multi-cycle utilization of fully-regenerated aggregate concrete is also discussed. The results show that: 1. The regenerated aggregate obtained by simple crushing is subjected to mechanical strengthening treatment, and the quality of the recycled aggregate, the water absorption, the apparent density, the packing density, the crushing index and the particle grading can be effectively improved good.2. In the case of the same matching ratio, the compressive strength of the full-regenerative aggregate concrete and the anti-chloride ion permeability are slightly lower than that of the common concrete, and the addition of the mineral admixture can improve the compressive strength and the chloride-ion permeability property of the fully-regenerated aggregate concrete, and the shape of the mineral admixture The effect of the state, the effect of the micro-aggregate and the pozzolanic effect are the main factors to improve the performance of the full-regenerative aggregate concrete. For the factors,3, the single-mixed fly ash and the mineral powder reduce the 7-d compressive strength of the fully-regenerated aggregate concrete, and the early strength of the fully-regenerated aggregate concrete mixed with the fly ash is more obvious when the same amount is used, and the content is less than 40%. When the fly ash and the mineral powder are mixed, the 90-d compression strength of the fully-regenerated aggregate concrete can be improved, the larger the mixing amount is, the more obvious the improvement is; the effect of the complex-doped fly ash and the mineral powder is better than that of the coal powder with the same mixing amount The different ratio of fly ash to mineral powder (1:3,1:1,3:1) has a certain effect on the compressive strength of the total recycled aggregate concrete 7d when the total amount of the complex admixture is certain, and is shown as 7 of the recycled concrete with high content of fly ash. D. The compressive strength is high, but it is resistant to the total recycled aggregate concrete 90d. The effect of the anti-chloride ion permeability of the fully-regenerated aggregate concrete is also affected by the fly ash and the content of the mineral powder. The higher the mixing amount, the more obvious the penetration resistance of the anti-chloride ion, but the anti-carbonization property of the fully-regenerated aggregate concrete and considering the compressive strength, the anti-chloride ion permeability and the anti-carbonization performance, the high-performance scheme is recommended to select the composite fly ash and the mineral powder, And the numerical analysis of the pozzolanic effect can quantify the contribution of the mineral admixture to the strength of the full-regenerative aggregate concrete, and accurately reflect the different age of the different mineral admixture in the full-regenerative aggregate concrete. The influence of fly ash and mineral powder on the performance of the fully-regenerated aggregate concrete is analyzed and the dynamic process of the effect of the fly ash and the mineral powder on the performance of the fully-regenerated aggregate concrete can be quantitatively described, and the total content of the mineral admixture is obtained through the comparison of the degree of association. The maximum impact factor of each performance, and the secondary effect factor of the compressive strength is the content of the mineral powder and the secondary effect of the chloride ion penetration. the level influence factor is the fly ash content.8, the mineral admixture can greatly reduce the volume percentage of the pore between 100 and 1000nm in the fully-regenerated aggregate concrete, The porosity of the raw concrete is improved, and the compactness of the secondary fully-regenerated concrete is improved.9. The performance of the secondary fully-regenerated concrete is reduced to a certain extent in terms of the compressive strength and the chloride-ion permeability, and the decrease of the compressive strength is about 15%. the rising range of the quantity is between 10% and 30%, and the ratio of the matching ratio is not changed,
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU528.041

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本文編號(hào)：2481948