全轻页岩陶粒纤维和非纤维混凝土的耐久性能试验研究

发布时间：2018-06-23 20:51

本文选题：轻骨料混凝土 + 聚丙烯纤维　；参考：《河南理工大学》2015年硕士论文

【摘要】：随着我国关于“建筑节能”“节能减排”战略的实施,新型绿色建筑材料日益受到重视。其中以页岩陶粒混凝土为代表的轻集料混凝土,在工程中正逐渐得到广泛应用。但对于轻集料混凝土的耐久性能,尤其是页岩陶粒纤维混凝土的物理力学性能和耐久性能,目前研究还不多见。因此,本文针对这两方面所存在的一些问题,主要进行了以下一些试验研究:(1)进行了全轻页岩陶粒纤维混凝土和素混凝土的力学性能对比试验,发现纤维对混凝土的抗压强度影响不大,但均有所提高,其提高幅度从高到低依次为:聚丙烯纤维钢纤维仿钢纤维;纤维对劈裂抗拉强度影响较大,且钢纤维表现最为显著,提高幅度高达35%。(2)进行了全轻页岩陶粒纤维混凝土和素混凝土的抗冻性能对比试验,发现纤维对混凝土抗冻性能提高明显,其中,聚丙烯纤维(PP纤维)最好,其次为钢纤维,最差的为仿钢纤维(HPP纤维)。这说明,纤维的掺入能够有效改善混凝土内部的结构,降低微裂缝在冻融条件下的增加速度,阻断裂缝贯通,从而提高了混凝土抗冻性能。(3)进行了全轻页岩陶粒纤维混凝土和素混凝土的抗碳化性能对比试验,结果表明,PP纤维和钢纤维能提高抗碳化能力,而HPP纤维则降低了抗碳化能力。素陶粒混凝土的碳化系数为2.96。(4)进行了全轻页岩陶粒纤维混凝土和素混凝土的抗渗性能对比试验,发现纤维能够有效改善混凝土的抗渗性能,其中,PP纤维效果较好,钢纤维几乎没有影响,而HPP纤维则降低了混凝土抗渗性能。(5)进行了全轻页岩陶粒纤维混凝土和素混凝土的抗氯离子性能对比试验,发现PP纤维能够降低通电量,提高了抗氯离子渗透能力;56d抗氯离子能力比28d的高。(6)对混掺纤维混凝土、素混凝土的耐久性能进行对比试验分析,试验证明,混掺纤维更好的提高了抗冻性能和抗渗性能。
[Abstract]:With the implementation of the strategy of "building energy saving" and "energy saving and emission reduction" in China, new green building materials are paid more and more attention. Among them, lightweight aggregate concrete, represented by shale ceramsite concrete, is gradually being widely used in engineering. However, there are few researches on the durability of lightweight aggregate concrete, especially the physical and mechanical properties and durability of shale ceramsite fiber concrete. Therefore, some problems in these two aspects have been studied in this paper as follows: (1) the comparative tests of mechanical properties of full light shale ceramsite fiber concrete and plain concrete have been carried out. It is found that the fiber has little effect on the compressive strength of concrete, but all of them are improved. The order of the increase range is as follows: polypropylene fiber steel fiber mimic steel fiber, fiber has great influence on the splitting tensile strength, and the steel fiber is the most remarkable. (2) A comparative test on the frost resistance of lightweight shale ceramsite fiber concrete and plain concrete was carried out. It was found that the fiber had a significant improvement on the frost resistance of concrete, among which polypropylene fiber (PP fiber) was the best, followed by steel fiber. The worst is steel-like fiber (HPP fiber). This shows that fiber incorporation can effectively improve the internal structure of concrete, reduce the increase rate of micro-cracks under freezing and thawing conditions, and block the cracks through. The results show that PP fiber and steel fiber can improve the carbonation resistance, while HPP fiber can reduce the carbonation resistance of concrete. (3) the carbonation resistance of concrete and plain concrete are compared. The results show that PP fiber and steel fiber can improve the carbonation resistance, while HPP fiber can reduce the carbonation resistance. The carbonation coefficient of plain ceramsite concrete is 2.96. (4) A comparative test on the impermeability of lightweight shale ceramsite fiber concrete and plain concrete is carried out. It is found that fiber can effectively improve the impermeability of concrete, among which PP fiber has a better effect. Steel fiber has little effect, while HPP fiber can reduce the impermeability of concrete. (5) the contrastive test of chlorine ion resistance of lightweight shale ceramsite fiber concrete and plain concrete shows that PP fiber can reduce the electric flux. The resistance to chloride ion permeation was improved by 56 days than that of 28 days. (6) the durability of mixed fiber reinforced concrete and plain concrete was compared and analyzed. The test results showed that the antifreeze and impermeability of mixed fiber were improved better than that of 28 days.
【学位授予单位】：河南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

【相似文献】