C35水下不分散混凝土研制
发布时间：2019-05-17 08:29
【摘要】：本文采用中国石油集团工程技术研究院研制的UWB-Ⅱ型抗分散剂,通过对不同配合比下水下不分散混凝土的抗分散性、流动性、水陆强度比等性能的试验研究,分析抗分散剂、粉煤灰、用水量、砂率对水下不分散混凝土性能的影响,并配制出C35水下不分散混凝土的最优配合比。 本文首先介绍了水下不分散混凝土的发展历史和研究概况,对水下不分散混凝土的应用技术做了简要的概括。然后依据《水下不分散混凝土试验规程》,运用正交试验研究混凝土抗分散剂、粉煤灰、水胶比以及砂率对水下不分散混凝土的流动性、抗分散性、立方体抗压强度的影响,并经过合理的调整,找到比较合理的配合比。 本文采用“四因素三水平”的正交试验法,以抗分散剂、粉煤灰、水胶比、砂率为本试验的四个因素,并以四因素三个水平组成的试验组进行试验。主要结论如下： 混凝土抗分散剂能保证混凝土在水中浇筑不泌水、不离析,在一定掺量范围内能够显著提高水下混凝土的强度,但对混凝土的流动性有不利影响,其流动性随着抗分散剂掺量的增加而减小。采用中国石油集团工程技术研究院研制的UWB-Ⅱ型抗分散剂时,2.5%掺量的混凝土抗分散剂比较合理。 混凝土的水胶比是影响水下不分散混凝土流动性和强度的一个重要因素,本试验中,水胶比为0.38时混凝土强度达到最大值,且此时水下不分散混凝土的流动性满足要求；随着水胶比的增大,混凝土的流动性虽然有所提高,但其强度降低的更为明显,所以在满足混凝土流动性的前提下,取最优水胶比为0.38。 粉煤灰能提高水下不分散混凝土的流动性并减少混凝土拌合物流动性的经时损失。粉煤灰还能提高水下抗分散混凝土后期强度,在20%～30%时,粉煤灰的作用效果最明显。
[Abstract]:In this paper, UWB- type II anti-dispersing agent developed by China Petroleum Group Engineering and Technology Research Institute is used to analyze the anti-dispersing agent through the experimental study on the anti-dispersion, mobility and water-land strength ratio of non-dispersed concrete under different mix ratios. The effects of fly ash, water consumption and sand ratio on the properties of underwater non-dispersed concrete are studied, and the optimal mix proportion of C35 underwater non-dispersed concrete is prepared. In this paper, the development history and research situation of underwater non-dispersion concrete are introduced, and the application technology of underwater non-dispersion concrete is briefly summarized. Then, according to the underwater non-dispersible concrete test code, the effects of concrete anti-dispersing agent, fly ash, water-binder ratio and sand ratio on the mobility, dispersion resistance and cube compressive strength of underwater non-dispersed concrete are studied by orthogonal test. And after reasonable adjustment, find a more reasonable mix ratio. In this paper, the orthogonal test method of "four factors and three levels" is used to take the anti-dispersing agent, fly ash, water-binder ratio and sand rate as the four factors of this experiment, and the experimental group composed of four factors and three levels is used to carry out the test. The main conclusions are as follows: the anti-dispersing agent of concrete can ensure that the concrete does not secrete and do not separate in the water, and can significantly improve the strength of underwater concrete in a certain range of content, but has a negative effect on the mobility of concrete. The mobility decreases with the increase of the content of anti-dispersing agent. When the UWB- type II anti-dispersing agent developed by China Petroleum Group Engineering and Technology Research Institute is used, the 2.5% content of concrete anti-dispersing agent is more reasonable. The water-binder ratio of concrete is an important factor affecting the mobility and strength of underwater non-dispersed concrete. In this experiment, when the water-binder ratio is 0.38, the strength of concrete reaches the maximum, and the mobility of underwater non-dispersed concrete meets the requirements. With the increase of water-binder ratio, although the mobility of concrete increases, but its strength decreases more obviously, so under the premise of satisfying the mobility of concrete, the optimal water-binder ratio is 0.38. Fly ash can improve the mobility of underwater non-dispersed concrete and reduce the time loss of concrete mixture. Fly ash can also improve the later strength of underwater anti-dispersion concrete, and the effect of fly ash is the most obvious when it is 20% 鈮，
本文编号：2478950
[Abstract]:In this paper, UWB- type II anti-dispersing agent developed by China Petroleum Group Engineering and Technology Research Institute is used to analyze the anti-dispersing agent through the experimental study on the anti-dispersion, mobility and water-land strength ratio of non-dispersed concrete under different mix ratios. The effects of fly ash, water consumption and sand ratio on the properties of underwater non-dispersed concrete are studied, and the optimal mix proportion of C35 underwater non-dispersed concrete is prepared. In this paper, the development history and research situation of underwater non-dispersion concrete are introduced, and the application technology of underwater non-dispersion concrete is briefly summarized. Then, according to the underwater non-dispersible concrete test code, the effects of concrete anti-dispersing agent, fly ash, water-binder ratio and sand ratio on the mobility, dispersion resistance and cube compressive strength of underwater non-dispersed concrete are studied by orthogonal test. And after reasonable adjustment, find a more reasonable mix ratio. In this paper, the orthogonal test method of "four factors and three levels" is used to take the anti-dispersing agent, fly ash, water-binder ratio and sand rate as the four factors of this experiment, and the experimental group composed of four factors and three levels is used to carry out the test. The main conclusions are as follows: the anti-dispersing agent of concrete can ensure that the concrete does not secrete and do not separate in the water, and can significantly improve the strength of underwater concrete in a certain range of content, but has a negative effect on the mobility of concrete. The mobility decreases with the increase of the content of anti-dispersing agent. When the UWB- type II anti-dispersing agent developed by China Petroleum Group Engineering and Technology Research Institute is used, the 2.5% content of concrete anti-dispersing agent is more reasonable. The water-binder ratio of concrete is an important factor affecting the mobility and strength of underwater non-dispersed concrete. In this experiment, when the water-binder ratio is 0.38, the strength of concrete reaches the maximum, and the mobility of underwater non-dispersed concrete meets the requirements. With the increase of water-binder ratio, although the mobility of concrete increases, but its strength decreases more obviously, so under the premise of satisfying the mobility of concrete, the optimal water-binder ratio is 0.38. Fly ash can improve the mobility of underwater non-dispersed concrete and reduce the time loss of concrete mixture. Fly ash can also improve the later strength of underwater anti-dispersion concrete, and the effect of fly ash is the most obvious when it is 20% 鈮，
本文编号：2478950
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