【摘要】：隨著現(xiàn)代建筑物不斷向高處發(fā)展,大流態(tài)混凝土因具備較大的流動(dòng)性和優(yōu)異的工作性能而備受青睞,但隨著流動(dòng)度的增加,拌合物離析、穩(wěn)定性差的風(fēng)險(xiǎn)就不斷提高,如何在保持流動(dòng)度增大的同時(shí)大流態(tài)混凝土仍具有良好的工作性能已成為重要的研究課題,而為解決該問題而提出的粉體、水粉比等參數(shù)又很難得到應(yīng)用。為此本文提出當(dāng)量粉漿體體積這一概念,并在此基礎(chǔ)上延伸出基于當(dāng)量粉漿體體積的大流態(tài)混凝土配合比設(shè)計(jì)方法,并通過試驗(yàn)驗(yàn)證這一概念的可行性。主要研究?jī)?nèi)容有:(1)因大流態(tài)混凝土缺少統(tǒng)一、準(zhǔn)確的定義,為明確研究對(duì)象,本文綜合多方資料對(duì)大流態(tài)混凝土進(jìn)行定義;對(duì)比并指出大流態(tài)混凝土配制理論與普通混凝土的差異,為大流態(tài)混凝土配合比設(shè)計(jì)指明了要點(diǎn)與方向;(2)通過需水量比試驗(yàn)測(cè)定各粉體的當(dāng)量系數(shù),提出了膠砂當(dāng)量粉漿體體積,并在對(duì)水泥膠砂進(jìn)行當(dāng)量粉漿體體積試驗(yàn)研究發(fā)現(xiàn),膠砂流動(dòng)度與當(dāng)量粉漿體體積近似呈線性關(guān)系,為大流態(tài)混凝土配合比設(shè)計(jì)提供了思路;(3)融入當(dāng)量粉漿體體積,提出了大流態(tài)混凝土配合比設(shè)計(jì)方法,通過純水泥和加入礦物摻料的混凝土試驗(yàn),確定不同流動(dòng)度下的大流態(tài)混凝土所對(duì)應(yīng)的合理當(dāng)量粉漿體體積范圍;(4)在當(dāng)量粉漿體體積確定的條件下,通過試驗(yàn)研究粗骨料最大粒徑和級(jí)配對(duì)大流態(tài)混凝土工作性能、強(qiáng)度、耐久性的影響。
[Abstract]:With the continuous development of modern buildings, large-flow concrete is favored for its high fluidity and excellent working performance. However, with the increase of fluidity and segregation of the mixture, the risk of poor stability increases continuously. It has become an important research topic that how to keep the flow degree increasing while the large flow concrete still has good working performance, and it is difficult to apply the parameters such as water-powder ratio to solve this problem. In this paper, the concept of equivalent slurry volume is proposed, and the design method of mass flow concrete mixture ratio based on equivalent slurry volume is extended, and the feasibility of the concept is verified by experiments. The main research contents are as follows: (1) due to the lack of a unified and accurate definition of large-flow concrete, this paper defines large-flow concrete by synthesizing multi-party data; Comparing and pointing out the difference between the mixing theory of large flow concrete and ordinary concrete, it points out the key points and direction for the mix proportion design of large flow concrete. (2) the equivalent coefficient of each powder is measured by water demand ratio test. In this paper, the equivalent slurry volume of cement sand is put forward, and the experimental study on the equivalent slurry volume of cement mortar shows that the flowing degree of cement sand is approximately linear with the equivalent slurry volume. It provides a way to design the mix ratio of large flow concrete. (3) put forward the design method of mix proportion of large flow concrete with equivalent slurry volume, and pass the test of pure cement and concrete with mineral admixture. (4) under the condition of the determination of equivalent slurry volume, the working performance and strength of coarse aggregate maximum particle size and gradation matched large-flow concrete are studied through experiments. The effect of durability.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

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