發(fā)布時(shí)間：2018-05-02 09:31

  本文選題：復(fù)合礦物摻合料 + 活性指數(shù)��； 參考：《吉林建筑大學(xué)》2013年碩士論文

【摘要】：首先本文從理論上分析了當(dāng)前采用等質(zhì)量取代水泥檢測復(fù)合礦物摻合料活性指數(shù)做法的不合理之處,即不同復(fù)合礦物摻合料因表觀密度變化幅度較大,摻入相同質(zhì)量礦物摻合料時(shí)膠漿體積卻大不相同,故不能客觀的評定出復(fù)合礦物摻合料的活性指數(shù),進(jìn)而影響復(fù)合礦物摻合料相關(guān)規(guī)范的制定,因此提出了等體積替代水泥法評定復(fù)合摻合料活性指數(shù)方法。經(jīng)過大量的試驗(yàn)研究證實(shí)等體積替代水泥法測得的復(fù)合摻合料的活性指數(shù)標(biāo)準(zhǔn)差遠(yuǎn)小于等質(zhì)量代替法測得的活性指數(shù)標(biāo)準(zhǔn)差。從而驗(yàn)證了等體積替代水泥法評定復(fù)合摻合料活性指數(shù)較等質(zhì)量替代水泥法更穩(wěn)定、更具科學(xué)合理性,并進(jìn)一步試驗(yàn)驗(yàn)證了復(fù)合摻合料等體積替代為水泥體積50%時(shí),測定復(fù)合摻合料活性指數(shù)是可取的。在本試驗(yàn)條件下再次證實(shí)了,摻合料復(fù)摻的綜合性能高于單摻的性能,粉煤灰與礦渣復(fù)摻能產(chǎn)生“超疊加效應(yīng)”,雖然摻入復(fù)合摻合料會(huì)降低膠凝材料早期強(qiáng)度,但能提高膠凝材料的后期強(qiáng)度,而且還可以減少試件的干燥收縮率。其次本文還對比了用簡單混合和粉磨激發(fā)法制備的復(fù)合摻合料拌制的混凝土性能,如混凝土的工作性能、力學(xué)性能及抗凍、抗?jié)B和體積收縮等。試驗(yàn)結(jié)果表明在粉煤灰與磨細(xì)礦渣摻合比例為2：1時(shí),并摻入少量石膏和硫酸鈉等外加劑進(jìn)行粉磨激發(fā)水泥及復(fù)合摻合料20分鐘,在復(fù)合摻合料取代40%水泥的情況下制備的混凝土,檢測混凝土28天齡期的力學(xué)性能及耐久性指標(biāo)遠(yuǎn)超過簡單混合法制得的混凝土。實(shí)測粉磨激發(fā)試件抗壓強(qiáng)度為32.9 MPa,而簡單混合法試件抗壓強(qiáng)度為29.5MPa,普通空白樣混凝土試件抗壓強(qiáng)度為30.7 MPa；在60d齡期時(shí),粉磨激發(fā)試件強(qiáng)度達(dá)到了43.8MPa,超出了簡單混合法試件強(qiáng)度14%以上。所以由試驗(yàn)可知,粉磨激發(fā)法制備的復(fù)合摻合料替代40%水泥不但能降低混凝土的施工成本,而且還能有效的提高混凝土中后期的抗壓強(qiáng)度、抗凍、抗?jié)B及抗收縮等性能。最后還用掃描電子顯微鏡對上述方法制得的水泥膠砂試件進(jìn)行了微觀結(jié)構(gòu)觀察,由微觀結(jié)構(gòu)可以證明,加入復(fù)合摻合料能大大增加水泥石的密實(shí)度,降低孔隙率,改善混凝土的顯微結(jié)構(gòu)。
[Abstract]:First of all, this paper theoretically analyzes the irrationality of using equal mass instead of cement to detect the activity index of mineral admixtures, that is, the apparent density of different mineral admixtures varies greatly. However, the volume of slurry varies greatly when the mineral admixture of the same quality is added, so the activity index of the compound mineral admixture can not be evaluated objectively, which will affect the formulation of the relevant specifications of the mineral admixture. Therefore, a method of evaluating the activity index of composite admixture by equal volume replacement cement is proposed. Through a lot of experimental studies, it is proved that the standard deviation of the active index of the composite admixture measured by the equal volume substitution cement method is much smaller than the standard deviation of the active index measured by the equal mass substitution method. It is verified that the evaluation of the activity index of the composite admixture by the equal volume substitution cement method is more stable and more scientific than that by the same quality replacement cement method, and it is further verified that the equal volume replacement of the composite admixture is 50 times the cement volume. It is advisable to determine the activity index of the compound admixture. Under the experimental conditions, it is proved that the comprehensive properties of the admixtures are higher than those of the single admixture, and the supersuperposition effect is produced by the co-mixing of fly ash and slag, although the early strength of the cementitious material can be reduced by the addition of the compound admixture. But it can improve the later strength of the cementing material and reduce the drying shrinkage of the specimen. Secondly, the properties of concrete prepared by simple mixing and grinding excitation method are compared, such as the working performance, mechanical properties, frost resistance, impermeability and volume shrinkage of concrete. The test results show that when the ratio of fly ash and fine grinding slag is 2:1, and a few admixtures such as gypsum and sodium sulfate are added, cement and compound admixture can be excited by grinding for 20 minutes. The concrete prepared by replacing 40% cement with compound admixture is used to test the mechanical properties and durability of concrete at 28 days of age, which is far more than that obtained by simple mixing method. The compressive strength of the specimen excited by grinding is 32.9 MPA, that of the simple mixed method is 29.5 MPA, the compressive strength of the ordinary blank concrete specimen is 30.7 MPA, and that of the normal blank concrete specimen is 30.7 MPA. The strength of the specimen excited by grinding is 43.8 MPA, which is more than 14% higher than that of the simple mixed method. Therefore, it can be seen from the test that the composite admixture prepared by grinding and excitation method can not only reduce the construction cost of concrete, but also can effectively improve the compressive strength, frost resistance, impermeability and shrinkage resistance of concrete. Finally, the microstructure of the cement sand made by the above method is observed by scanning electron microscope. It can be proved from the microstructure that the compactness of cement stone can be greatly increased and the porosity can be reduced by adding compound admixture. Improve the microstructure of concrete.
【學(xué)位授予單位】：吉林建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528.041

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本文編號(hào)：1833337