本文選題：保坍增強(qiáng) + 工作性能�。� 參考：《北京建筑大學(xué)》2015年碩士論文

【摘要】：近年來(lái),我國(guó)大興土木,消耗了大量的能源、資源,導(dǎo)致一些地區(qū)在近年來(lái)出現(xiàn)資源匱乏、原材料質(zhì)量惡化的問(wèn)題,這些問(wèn)題使實(shí)際工程應(yīng)用中的一部分混凝土出現(xiàn)坍落度損失過(guò)快、強(qiáng)度不足、耐久性差等問(wèn)題。實(shí)際工程中應(yīng)對(duì)這類問(wèn)題常見的方法是使用提高減水劑的摻量或復(fù)配葡鈉等緩凝功能組份,然而減水劑摻量過(guò)高容易造成混凝土離析泌水,繼續(xù)加大緩凝組分摻量并不能增大其緩凝效果,目前在很多實(shí)際工程應(yīng)用中非常需要一種可以改善混凝土工作性,延緩坍落度損失和提高混凝土強(qiáng)度的新型外加劑。本課題研制的具有保坍增強(qiáng)功能的混凝土外加劑BTC-3主要成分為保坍助劑BTC500和增強(qiáng)型功能型外加劑BTC-2,作為外加劑單獨(dú)摻加使用時(shí)不僅能改善混凝土工作性和力學(xué)性還可以有效減少混凝土坍落度經(jīng)時(shí)損失,在一些水泥用量偏高的地區(qū)使用可以適當(dāng)?shù)臏p少一部分水泥用量,混凝土各齡期強(qiáng)度不降低。BTC-3是一種新型的混凝土保坍增強(qiáng)劑,可以顯著改善混凝土勻質(zhì)性,使混凝土工作性能得到明顯改善,離析泌水現(xiàn)象減少,有效降低混凝土坍落度經(jīng)時(shí)損失,使混凝土內(nèi)部更加密實(shí),對(duì)高混凝土耐久性有利。試驗(yàn)結(jié)果表明:(1)以BTC500替代30%~50%的BTC-2時(shí)配制的混凝土強(qiáng)度最好、工作性最佳,坍落度經(jīng)時(shí)損失最小。(2)單獨(dú)摻加BTC-3,摻量在0~1%范圍內(nèi)遞增時(shí),水泥凈漿流動(dòng)度先減小后增大,水泥凈漿粘度先增大后減小。(3)使用BTC-3配制的混凝土工作性能得到明顯改善,混凝土坍落度經(jīng)時(shí)損失減小。(4)單獨(dú)摻加BTC-3混凝土28d強(qiáng)度提高2~5MPa,長(zhǎng)期強(qiáng)度不倒縮;與水泥適應(yīng)性能良好,水泥用量偏高的情況下,摻加BTC-3并且降低5%~9%的水泥用量,混凝土各齡期強(qiáng)度不降低,長(zhǎng)期強(qiáng)度不倒縮。(5)摻加BTC-3的混凝土內(nèi)部更加密實(shí),有助于提高凝土耐久性。
[Abstract]:In recent years, our country has built up a large amount of energy and resources, which has led to the shortage of resources and the deterioration of raw material quality in some regions in recent years.These problems make some concrete in practical engineering lose too fast slump, insufficient strength, poor durability and so on.The common way to deal with this kind of problems in practical engineering is to increase the content of water reducer or the retarding function component such as compound sodium gluconate. However, the excessive amount of water reducing agent can easily cause the concrete to separate and bleed.Increasing the content of retarding component can not increase its retarding effect. At present, a new kind of admixture which can improve the workability of concrete, delay the loss of slump and increase the strength of concrete is needed in many practical engineering applications.The main components of concrete admixture BTC-3, which has the function of anti-collapse and strengthening, are BTC500 and BTC-2, which can not only improve the workability and mechanical properties of concrete, but also improve the workability and mechanical properties of concrete.It can also effectively reduce the slump loss of concrete.In some areas where the cement content is too high, the amount of cement can be appropriately reduced, and the strength of concrete at different ages is not reduced. BTC-3 is a new type of concrete strengthening agent, which can significantly improve the homogeneity of concrete.The concrete working performance is improved obviously, the phenomenon of segregation and bleeding is reduced, the slump loss of concrete is effectively reduced, and the concrete interior is more compact, which is beneficial to the durability of high concrete.The test results show that when BTC500 is used instead of 30% BTC-2, the concrete strength is the best, the workability is the best, and the slump loss is the least. The cement paste fluidity decreases first and then increases when the addition of BTC-3 is increased in the range of 0.1%.The cement paste viscosity increased first and then decreased. 3) the concrete working performance of concrete prepared with BTC-3 was obviously improved, and the slump loss of concrete decreased. 4) the 28d strength of concrete mixed with BTC-3 alone increased by 2? 5 MPa, and the long-term strength did not shrink.In the case of good adaptability to cement and high cement content, the concrete added with BTC-3 and reduced by 5% or 9% of the cement content, the strength of concrete at each age does not decrease, and the long-term strength does not shrink. 5) the concrete with BTC-3 is more dense.It is helpful to improve the durability of clay.
【學(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528.042

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本文編號(hào)：1741197