地聚物橡胶混凝土的力学、抗冲击性能及强度机理分析

摘要/Abstract

摘要： 为探究橡胶再生集料在地聚物混凝土中的增韧作用,采用不同比例的橡胶再生集料(粒径为0.15~0.3 mm和1~4 mm)代替地聚物混凝土中的普通集料。首先,采用工业废渣中粒化高炉矿渣粉为原料,水玻璃溶液和NaOH为激发剂制备地聚物胶凝材料,并与普通集料、橡胶再生集料混合制备地聚物橡胶混凝土;然后对地聚物橡胶混凝土的力学性能、抗冲击性能和强度机理进行探究。结果表明:添加适量比例的橡胶再生集料可提高地聚物混凝土的抗压强度,增幅为5%左右,这与橡胶再生集料表面在NaOH碱环境中的氧化和降解作用有关;但地聚物橡胶混凝土在劈裂荷载和弯曲荷载下易断裂,劈裂抗拉强度和抗折强度降低20%~30%,这是地聚物橡胶混凝土的典型特点。通过落锤冲击试验和弯拉冲击试验可知,橡胶再生集料能大幅提高地聚物混凝土的抗冲击性能,最高增幅超过200%。这是由于橡胶再生集料具有的柔性和弹性特征吸收了部分冲击能量,同时延缓了冲击荷载下混凝土初始开裂到失效破坏过程,减少了裂缝开裂应力集中,提高了地聚物混凝土的延性。在地聚物碱性条件下,橡胶颗粒表面发生氧化和降解作用,表面变得粗糙,与地聚物基体结合紧密;橡胶表面在NaOH作用下,产生羟基、羧基等亲水基团,有利于水化产物在橡胶再生集料表面附着。

关键词: 地聚物混凝土, 橡胶再生集料, 力学性能, 抗冲击性能, 固体废物

Abstract: In order to explore the toughening effect of recycled rubber aggregate in geopolymer concrete, different proportion of recycled rubber aggregate (particle size 0.15~0.3 mm and 1~4 mm) was used to replace the natural aggregate in geopolymer concrete. Firstly, geopolymer cementitious material was prepared with granulated blast furnace slag powder as raw material, sodium silicate solution and NaOH as activators, and combined with natural aggregate and recycled rubber aggregate to prepare geopolymer rubber concrete. Then the mechanical properties, impact resistance and strength mechanism of geopolymer rubber concrete were studied. The results show that the compressive strength of geopolymer concrete can be improved with an increase of about 5% by adding an appropriate proportion of recycled rubber aggregate, which is related to the oxidation and degradation of recycled rubber aggregate surface in NaOH alkali environment. However, geopolymer rubber concrete is easy to fracture under indirect tensile load and bending load, and the indirect tensile strength and flexural strength are reduced by 20%~30%, which is a typical feature of geopolymer rubber concrete. In drop hammer impact test and flexural tensile impact test, recycled rubber aggregate can greatly improve the impact resistance of geopolymer concrete with the maximum increase up to more than 200%. It is due to the flexible and elastic characteristic of recycled rubber aggregate, which absorbs some impact energy. At the same time, recycled rubber aggregate also delays the process from initial cracking to failure of concrete under impact load, reduces the stress concentration of crack cracking, and improves the ductility of geopolymer concrete. Under the alkaline condition of geopolymer, the surface of rubber particles is oxidized and degraded, and the surface becomes rough and closely combines with geopolymer matrix. Under the action of NaOH, hydrophilic groups such as hydroxyl and carboxyl groups are produced on the rubber surface, which is conducive to the adhesion of hydration products on the surface of recycled rubber aggregate.

Key words: geopolymer concrete, recycled rubber aggregate, mechanical property, impact resistance, solid waste

中图分类号:

TU528

杨鹏辉, 姚远. 地聚物橡胶混凝土的力学、抗冲击性能及强度机理分析[J]. 硅酸盐通报, 2023, 42(1): 239-247.

YANG Penghui, YAO Yuan. Analysis of Mechanical Properties, Impact Resistance and Strength Mechanism of Geopolymer Rubber Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(1): 239-247.

参考文献

[1] 姜敏,寇志敏,彭少贤.废旧橡胶回收与利用的研究进展[J].合成橡胶工业,2013,36(3):239-243.
JIANG M, KOU Z M, PENG S X. Research progress in recycling of waste rubber[J]. China Synthetic Rubber Industry, 2013, 36(3): 239-243 (in Chinese).
[2] 李赞成,许金余,罗鑫,等.橡胶混凝土的基本力学特性的试验研究[J].硅酸盐通报,2013,32(12):2589-2594.
LI Z C, XU J Y, LUO X, et al. Experimental study on the basic mechanical properties of rubber powder concrete[J]. Bulletin of the Chinese Ceramic Society, 2013, 32(12): 2589-2594 (in Chinese).
[3] 葛文慧.废弃橡胶混凝土的力学性能和断裂韧性及抗冻性能[J].合成橡胶工业,2019,42(6):474-478.
GE W H. Mechanical properties, fracture toughness and frost resistance of waste rubber concrete[J]. China Synthetic Rubber Industry, 2019, 42(6): 474-478 (in Chinese).
[4] 田中男,张争奇,李乃强,等.工业废渣地聚合物注浆材料组分及性能增强的研究进展[J].材料导报,2020,34(19):19034-19042.
TIAN Z N, ZHANG Z Q, LI N Q, et al. Composition and performance enhancement of geopolymer grouting materials with industrial residue: a review[J]. Materials Reports, 2020, 34(19): 19034-19042 (in Chinese).
[5] TIAN Z N, ZHANG Z Q, LIU H B, et al. Interfacial characteristics and mechanical behaviors of geopolymer binder with steel slag aggregate: insights from molecular dynamics[J]. Journal of Cleaner Production, 2022, 362(1): 132385.
[6] 田中男,张争奇,刘恒彬,等.考虑矿物各向异性的地聚物/集料界面静动态交互特征模拟[J].中国公路学报,2022,35(12):36-46.
TIAN Z N, ZHANG Z Q, LIU H B, et al. Static and dynamic interfacial interactions of geopolymer-aggregate considering anisotropic mineral surfaces: a molecular dynamics study[J]. China Journal of Highway and Transport, 2022, 35(12): 36-46 (in Chinese).
[7] 杨长辉,田义,王磊,等.NaOH预处理对橡胶混凝土性能的影响[J].土木建筑与环境工程,2016,38(2):44-50.
YANG C H, TIAN Y, WANG L, et al. Influence of NaOH Pretreatments on the properties of rubber concrete[J]. Journal of Civil, Architectural ＆ Environmental Engineering, 2016, 38(2): 44-50 (in Chinese).
[8] 周莹莹,李建沛.橡胶处理方法对橡胶混凝土路用性能的影响[J].合成橡胶工业,2020,43(2):144-147.
ZHOU Y Y, LI J P. Effect of rubber treatment method on road performance of rubber concrete[J]. China Synthetic Rubber Industry, 2020, 43(2): 144-147 (in Chinese).
[9] 庞建勇,张琴,姚韦靖,等.钢纤维橡胶混凝土力学性能试验[J].中国科技论文,2020,15(11):1302-1307.
PANG J Y, ZHANG Q, YAO W J, et al. Mechanical property test of steel fiber rubber concrete[J]. China Sciencepaper, 2020, 15(11): 1302-1307 (in Chinese).
[10] LIU F, CHEN G X, LI L J, et al. Study of impact performance of rubber reinforced concrete[J]. Construction and Building Materials, 2012, 36: 604-616.
[11] ALSAIF A, ALBIDAH A, ABADEL A, et al. Development of metakaolin-based geopolymer rubberized concrete: fresh and hardened properties[J]. Archives of Civil and Mechanical Engineering, 2022, 22(3): 144.
[12] 李燕飞,郭庆.橡胶混凝土的抗冻融和抗冲击性能研究[J].新型建筑材料,2021,48(5):71-73+86.
LI Y F, GUO Q. Research on freeze-thaw and impact resistance of rubber concrete[J]. New Building Materials, 2021, 48(5): 71-73+86 (in Chinese).
[13] AKBARZADEH BENGAR H, SHAHMANSOURI A A, AKKAS ZANGEBARI SABET N, et al. Impact of elevated temperatures on the structural performance of recycled rubber concrete: experimental and mathematical modeling[J]. Construction and Building Materials, 2020, 255: 119374.
[14] AL-TAYEB M, BAKAR B H, MD AKIL H, et al. Experimental and numerical investigations of the influence of reducing cement by adding waste powder rubber on the impact behavior of concrete[J]. Computers and Concrete, 2013, 11(1): 63-73.

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