自密实玄武岩纤维炉渣混凝土性能研究

发布时间：2018-06-01 00:53

本文选题：自密实 + 炉渣　；参考：《石河子大学》2017年硕士论文

【摘要】：煤炭是我国最重要的能源物资,即使在能源结构发生巨大变化的今天,煤炭仍占据66%的能源消耗。煤炭资源被用于支撑社会经济的进步,同时也伴随着大量工业废渣的产生。采用炉渣完全代替砂石而作为混凝土骨料,制备自密实混凝土,一方面保护了环境,另一方面提高了工业固体废弃物的经济价值,做到了变废为宝。本论文利用水泥、粉煤灰、炉渣、玄武岩纤维和聚羧酸减水剂制备自密实纤维炉渣混凝土,采用单因素与多因素相结合的试验方法,考虑在不同水胶比、粉煤灰取代率和纤维掺量下自密实玄武岩纤维炉渣混凝土各项性能变化趋势,得到下列结论:(1)选用单因素试验研究不同水胶比对自密实炉渣混凝土性能的影响,结果表明:炉渣可以取代普通砂制成自密实轻骨料混凝土,试验设计的五组不同水胶比所制备的自密实炉渣混凝土具有良好的填充性、抗离析稳定性和间隙通过性,其性能可以达到《自密实混凝土应用技术规程》的要求。试验的最优水胶比为0.42,此时表观密度为1711.8kg/m3,抗压强度为12.43MPa,抗折强度为2.4MPa。(2)采用单因素试验研究不同粉煤灰取代率对自密实炉渣混凝土性能的影响,以不同粉煤灰取代率所制备的五组自密实炉渣混凝土具有较好的填充性、间隙通过性及抗离析稳定性,其工作性能均满足《自密实混凝土应用技术规程》的要求,掺杂粉煤灰以后混凝土的工作性能有了大幅改善,其中当粉煤灰取代率为70%时,工作性能最优。其表观密度有一定程度下降。在力学性能方面,抗压强度提升明显,最高达到21.2MPa。当粉煤灰取代率为70%时,抗折强度达到最大值2.2MPa,此时抗压强度为16.2MPa。(3)采用单因素试验研究不同玄武岩纤维掺量对自密实炉渣混凝土性能的影响趋势,试验结果表明:纤维掺量为0.5、1.5、2.5kg/m3时,自密实纤维炉渣混凝土的填充性、间隙通过性及抗离析稳定性相比普通自密实炉渣混凝土有所下降,但其工作性能仍能满足《自密实混凝土应用技术规程》的要求。其中当纤维掺量为1.5kg/m3时,所制备的自密实纤维炉渣混凝土工作性能最优;表观密度较普通自密实炉渣混凝土有一定程度下降;在力学性能方面,抗压强度和抗折强度均先增加后降低,且当纤维掺量为1.5kg/m3时,此时力学性能最优,抗压强度为18.6MPa,抗折强度为2.16MPa。(4)采用正交试验研究不同水胶比、粉煤灰取代率和纤维掺量三个因素共同作用下自密实玄武岩纤维炉渣混凝土性能变化趋势。结果表明,在三个因素中,水胶比和玄武岩纤维掺量对混凝土拌合物性能影响较为明显,粉煤灰取代率影响较弱,其中水胶比对T500、表观密度和抗压强度影响明显,纤维掺量对坍落扩展度及抗折强度影响显著。最终确定的自密实玄武岩纤维炉渣混凝土的最佳配合比为水胶比0.42,粉煤灰取代率70%,玄武岩纤维掺量1.5kg/m3。采用试验确定的最佳配合比进行了验证性试验,试验结果满足建筑隔墙条板的性能要求,可用于实际生产之中。
[Abstract]:Coal is the most important energy material in China. Even in today's energy structure, coal still occupies 66% of the energy consumption. Coal resources are used to support the progress of social and economic development. At the same time, it is accompanied by the production of a large number of industrial waste. The slag is used as concrete aggregate instead of sand and concrete, and self compacting concrete is prepared. On the one hand, the environment is protected, on the other hand, the economic value of industrial solid waste has been improved. The paper makes use of cement, fly ash, slag, basalt fiber and polycarboxylic acid water reducing agent to prepare self compacting fiber slag concrete, and the combination of single factor and polyindin is used to consider the different ratio of water to glue and powder. The following conclusions are obtained as follows: (1) the effect of the single factor test on the performance of the self compacting slag concrete is studied by single factor test. The results show that the slag can be replaced by ordinary sand to make self compacting lightweight aggregate concrete and five groups of experimental designs. The self compacting slag concrete prepared with different water and glue ratio has good filling property, resistance to segregation stability and clearance, and its performance can meet the requirements of the application technical specification for "self compacting concrete". The optimum water binder ratio of the test is 0.42, the apparent density is 1711.8kg/m3, the compressive strength is 12.43MPa, and the flexural strength is 2.4MPa. (2). The effect of different fly ash substitution rate on the performance of self compacting slag concrete is studied by single factor test. The five groups of self compacting slag concrete with different fly ash substitution rate have better filling, clearance and anti segregation stability, and their working properties meet the requirements of the application technical regulations of self compacting concrete. The performance of concrete has been greatly improved after the fly ash. When the fly ash substitution rate is 70%, the performance of the concrete is the best. The apparent density decreases to a certain extent. In the mechanical properties, the compressive strength is improved obviously, the maximum to 21.2MPa. when the fly ash substitution rate is 70%, the flexural strength reaches the maximum value of 2.2MPa, and the compression strength is at this time. The strength is 16.2MPa. (3) using single factor test to study the influence trend of different basalt fiber content on the performance of self compacting slag concrete. The test results show that when the fiber content is 0.5,1.5,2.5kg/m3, the filling property of the self compacting fiber slag concrete, the clearance and the anti segregation stability are compared with the ordinary self compacting slag concrete. But its performance can still meet the requirements of the technical specification for the application of self compacting concrete. When the fiber content is 1.5kg/m3, the performance of the self compacting fiber slag concrete is optimal, and the apparent density is lower than that of the ordinary self compacting slag concrete; in the mechanical properties, the compressive strength and the flexural strength of the concrete. When the fiber content is 1.5kg/m3, the mechanical properties are the best, the compressive strength is 18.6MPa, the flexural strength is 2.16MPa. (4), and the orthogonal test is used to study the performance trend of the self compacting basalt fiber slag concrete under the effect of three factors, such as different water glue ratio, fly ash substitution rate and fiber content. In three factors, the effect of water gel ratio and basalt fiber content on the performance of concrete mixture is more obvious, and the effect of fly ash substitution rate is weak. The effect of water glue ratio on T500, apparent density and compressive strength is obvious, and the fiber content has a significant effect on the slump expansion and flexural strength. The optimum mixture ratio of soil to soil is 0.42 of water glue ratio, 70% of the substitution rate of fly ash, and the 1.5kg/m3. of basalt fiber is tested by the optimum mix ratio determined by the test. The test results meet the performance requirements of the building partition bar and can be used in the actual production.
【学位授予单位】：石河子大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

【参考文献】