秸秆基混凝土的性能研究
发布时间：2018-10-29 22:36
【摘要】：由于城市化进程的推进,城市建设需要大量不同功能、不同种类的混凝土混凝土种类的增加要求利用新材料和新技术。为了经济有效地提高混凝土的各项性能,生物质纤维、具有水硬活性的矿物已经开始被用作掺合料拌制混凝土。我们了解到,稻草等秸秆富含能在一定程度上替代混凝土中钢筋的纤维；富含具有水硬活性的游离二氧化硅,然而,目前为止,国内外的研究对象均局限于小麦秸秆和稻壳等极少部分农作物剩余物,而油菜秸秆等鲜见研究。 本文基于上述现状,选择油菜秸秆为研究对象,就秸秆基混凝土的相关性能进行深入研究。作者将油菜秸秆粉碎后增量替代水泥添加到混凝土中；将油菜秸秆灰分等量替代水泥添加到混凝土中,且该油菜秸秆灰分,是在通过对其水硬活性影响因素进行试验研究得到的油菜秸秆中二氧化硅活性最佳激发条件下灰化油菜秸秆所得。分别测出混凝土的和易性、表观密度、抗压强度及PH值,并进行数据分析,主要结论如下 (1)相同配合比条件下,随着秸秆碎料掺量的增加,混凝土表观密度和抗压强度均降低；但当秸秆长度大于2.0cm时,抗压强度降低幅度趋缓,且极限承载状态下表现出良好的塑性。 (2)水洗能使油菜秸秆灰分中Si02的质量百分比增大60%以上,碱金属及易挥发物质减少50%以上,灰分熔点得到有效提高,结渣率明显降低；油菜秸秆灰分中SiO2潜在水硬活性激发最完全的条件为：油菜秸秆经水洗,在500℃下恒温煅烧5h。 (3)混凝土中秸秆灰分的最适掺量大约为20%；灰分掺量为20%时,水灰比取0.5,混凝土性能最优。 (4)粉碎处理添加法适用于对混凝土强度要求不高但对其韧性有要求的非主体混凝土构件；而煅烧处理添加法适用于承载不大的农村建筑主体混凝土构件,实现了就地取材。
[Abstract]:Due to the advancement of urbanization, urban construction needs a large number of different functions, and the increase of different types of concrete requires the use of new materials and new technologies. In order to improve the performance of concrete economically and effectively, biomass fiber, minerals with water-hardening activity, have been used as admixtures to mix concrete. We know that straw, such as straw, is rich in fibers that can replace steel bars in concrete to some extent; Free silica with water-hardening activity is rich, however, so far, the research objects at home and abroad are limited to wheat straw and rice husk and so on very few crop residues, but rape straw and so on rare research. In this paper, rape straw is chosen as the research object, and the correlativity of straw based concrete is studied deeply. The author added the incremental cement to the concrete after the rape straw was crushed. The ash content of rape straw was replaced by cement, and the ash content of rape straw was added to the concrete. It is obtained from the best activation condition of silica in rape straw by the experimental study on the influencing factors of its water-hardening activity. The easiness, apparent density, compressive strength and PH value of concrete were measured, and the data were analyzed. The main conclusions were as follows: (1) under the same mixture ratio, with the increase of the amount of straw debris, The apparent density and compressive strength of concrete decreased. However, when the straw length is larger than 2.0cm, the reduction of compressive strength slows down, and it shows good plasticity under the ultimate loading condition. (2) washing can increase the mass percentage of Si02 in rape straw ash by more than 60%, decrease alkali metal and volatile matter by more than 50%, increase ash melting point effectively and reduce slagging rate obviously; The most complete conditions for the activation of SiO2 potential water-hardening activity in rape straw ash were as follows: rape straw was washed and calcined at 500 鈩，
本文编号：2299032
[Abstract]:Due to the advancement of urbanization, urban construction needs a large number of different functions, and the increase of different types of concrete requires the use of new materials and new technologies. In order to improve the performance of concrete economically and effectively, biomass fiber, minerals with water-hardening activity, have been used as admixtures to mix concrete. We know that straw, such as straw, is rich in fibers that can replace steel bars in concrete to some extent; Free silica with water-hardening activity is rich, however, so far, the research objects at home and abroad are limited to wheat straw and rice husk and so on very few crop residues, but rape straw and so on rare research. In this paper, rape straw is chosen as the research object, and the correlativity of straw based concrete is studied deeply. The author added the incremental cement to the concrete after the rape straw was crushed. The ash content of rape straw was replaced by cement, and the ash content of rape straw was added to the concrete. It is obtained from the best activation condition of silica in rape straw by the experimental study on the influencing factors of its water-hardening activity. The easiness, apparent density, compressive strength and PH value of concrete were measured, and the data were analyzed. The main conclusions were as follows: (1) under the same mixture ratio, with the increase of the amount of straw debris, The apparent density and compressive strength of concrete decreased. However, when the straw length is larger than 2.0cm, the reduction of compressive strength slows down, and it shows good plasticity under the ultimate loading condition. (2) washing can increase the mass percentage of Si02 in rape straw ash by more than 60%, decrease alkali metal and volatile matter by more than 50%, increase ash melting point effectively and reduce slagging rate obviously; The most complete conditions for the activation of SiO2 potential water-hardening activity in rape straw ash were as follows: rape straw was washed and calcined at 500 鈩，
本文编号：2299032
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