水泥混凝土路面薄层快速修补材料的研究
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摘要
近年来我国混凝土路面的破损日益严重,由此造成的社会影响和经济损失十分巨大,因此对路面状况的维护和轻度破坏的修补越来越受到工程界的重视,混凝土路面薄层修补材料研发的重大意义也突显出来。本文对薄层快速修补胶凝材料配伍、薄层快速修补混凝土的配合比设计、工作性能、力学性能、体积稳定性及耐久性能进行了较系统的研究。论文主要研究内容与结论如下:
     1、对薄层快速修补胶凝材料配伍进行了深入研究,研究结果表明:普通硅酸盐水泥与SAC、UFA以合适比例复配,砂浆凝结时间、工作性能均能较好地满足现场施工要求。其2h抗折、抗压强度能够达到2h开放交通的(抗折强度3.15MPa,抗压强度12.0MPa)要求,1d抗折强度也可以达到设计强度的100%要求,并且后期强度稳步增加。其微观分析的研究表明:合理配伍胶凝材料的早期水化程度高,硬化水泥石结构致密。
     2、在优化胶凝材料配伍的基础上,系统研究了水胶比、砂率、不同胶凝材料配伍等因素对HSSFAC力学性能的影响,并优选出适宜的混凝土配比。试验结果表明:选用配伍合理的胶凝材料和适宜的水胶比、砂率配制的HSSFAC浇注后和易性优良(坍落度200mm),可实现4h开放交通,1d抗折强度达到设计强度的100%。
     3、新老混凝土试件抗剪强度、抗折强度和新老混凝土的粘结性能试验结果表明:粗糙度的增加有助于提高新老混凝土的粘结强度,且粘结强度随着龄期的增长而增加。
     4、HSSFAC、TRRM的干缩性能研究结果表明:其早期收缩比普通混凝土、砂浆稍大,但随着龄期的增长,干缩值与普通混凝土、砂浆趋于一致。
     5、HSSFAC、TRRM抗裂性能的研究表明:HSSFAC、TRRM开裂等级均为Ⅰ级,说明HSSFAC、TRRM在约束条件下具有优异的抗裂能力。
     6、HSSFAC、TRRM弹性模量研究结果表明:HSSFAC的弹性模量与普通混凝土基本相当;TRRM由于配比中的胶凝材料与砂比例较小使得其具有更小的弹性模量,即具有更好的抗裂性能。
     7、HSSFAC、TRRM的抗氯离子渗透能力均优良。
In recent years, the breakage of our country concrete road is increasingly serious. Thus the society effect and the economy lose becomes very huge. So the maintenance of pavement condition and the repair of slightly break is more and more valued by the engineering field, the great significance of studing thin layer rapid repair material for concrete pavement also brings into relief. This paper systematically studies the compatibility of gelatinization material, preparation technology of thin layer rapid repair concrete or mortar, workability, mechanical properties, capacity stability and durability. The main contents and conclusions of the study are as follows:
     1. Studies the compatibility of gelatinization materialof thin rapid repair material in depth. The results indicates: the time of setting and workability can satisfy construction require of job location, flexural strength and the compression strength will satisfy with the requirement of opening to traffic at 2hours, flexural strength of 1d research to 100% of designing strength, and later period strength will increase steadily, if P.O, SAC and UFA go together with suitable comparison. The micro-analysis shows : the early hydration drgree of due compatibility gelatinization is high, and the construction is compact.
     2. Based on the optimized mixture proportion, this paper systematically studies the factors affecting the mechanical properties of w/B, rate of sand, and different gelatinization compatibility .the results indicates: after casting, HSSFAC with due W/B, rate of sand and gelatinization compatibility has good workability ( slump 200mm)and can satisfy the requirement of opening to traffic at 4hours. Flexural strength of 1d reaches 100% of designing strength. And the workability is good , it satisfy the especial requirement of thin layer repairing.
     3. On the studing of bond strength of new-old concrete, the author analyzes the effect of roughness to bond strength. Checks the bond characterized of new-old concrete by detecting flexural strength and compression strength. The results shows : the increasing of roughness improves the increasing of bond for new-old concrete, and bond strength enhances with the increasing of age.
     4. The studing on dry strinkage of HSSFAC、TRRM indicates: the dry strinkage is larger than ordinary concrete or mortar. But with the increasing of age, it tends to same class.
     5. The studing on crack resistance of HSSFAC、TRRM shows :the crack resistance degree of HSSFAC、TRRM are all I degree,so they have good crack resistance.
     6. The studing on Young's modulus of HSSFAC、TRRM shows : the Young's modulus of HSSFAC balances ordinary concrete; HSSFAC、TRRM's is higer than ordinary mortar's , just because it's gelatinization sand rate is smaller. So the crack resistance of mortar is better.
     7. HSSFAC、TRRM all have good resistance to chloride permeability.
引文
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