Salt Frost Resistance and Fatigue Characteristics of Self-Curing Pavement Concrete

Abstract

Abstract: In order to improve the durability of pavement concrete effectively, the salt freeze-thaw test, fracture performance test before and after salt freeze-thaw cycles, and fatigue test for flexural load were conducted to explore the variation rule of salt frost resistance and fatigue characteristics of super absorbent polymer (SAP) self-curing pavement concrete with different SAP dosages and particle sizes. Combined with the pore parameters, microstructure, and the characteristics of the aggregate-cement interfacial transition zone (ITZ) of self-curing cement paste, the influence mechanism of performance was revealed. The results show that the residual pores formed by SAP with smaller particle size can effectively release the tensile stress, reduce the freezing point and refine the pore structure, which can enhance the salt frost resistance of pavement concrete. After 30 times freeze-thaw cycles, the fracture toughness loss rate and fracture energy loss rate of pavement concrete with SAP particle size of 100 mesh (150 μm) and content of 0.145%(mass fraction) decrease by 25.25% and 10.51% respectively, compared with the reference group. The enhancement degree of SAP to fatigue life increases with the increase of stress level. When the fatigue load stress level is 0.80, the fatigue life of pavement concrete is 2.65 times higher than the reference group. SAP can effectively improve the internal compactness of cement concrete structure, hold part of ITZ moisture, enhance the bonding between cement paste and aggregate, thus the salt frost resistance and fatigue characteristics of concrete are improved.

Key words: self-curing pavement concrete, super absorbent polymer, salt frost resistance, fatigue characteristic, pore structure, interfacial transition zone

CLC Number:

U414

QIN Xiao, XU Jieting, SHEN Aiqin, LYU Zhenghua, XIE Zhengzhuan. Salt Frost Resistance and Fatigue Characteristics of Self-Curing Pavement Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2784-2793.

References

[1] 曹沈阳,包得祥.季冻地区路用水泥混凝土抗盐冻性能试验研究[J].中外公路,2020,40(5):291-294.
CAO S Y, BAO D X. Experimental study on salt frost resistance of cement concrete pavement in season frozen area[J]. Journal of China & Foreign Highway, 2020, 40(5): 291-294 (in Chinese).
[2] 郭寅川,申爱琴,王胜难,等.季冻区路面混凝土界面区劣化行为及与强度相关性[J].中国公路学报,2019,32(8):49-57.
GUO Y C, SHEN A Q, WANG S N, et al. Deterioration behavior of interfacial transition zone and its correlation with strength of a concrete pavement in seasonal frost region[J]. China Journal of Highway and Transport, 2019, 32(8): 49-57 (in Chinese).
[3] 覃潇,申爱琴,杨景玉,等.内养生路面混凝土水分传输特性及力学性能研究[J/OL].建筑材料学报:1-13[2021-02-19].http://kns.cnki.net/kcms/detail/31.1764.tu.20201118.1720.016.html.
QIN X, SHEN A Q, YANG J Y, et al. Water transport characteristics and mechanical properties of internal curing pavement concrete[J/OL]. Journal of Building Materials: 1-13 [2021-02-19]. http://kns.cnki.net/kcms/detail/31.1764.tu.20201118.1720.016.html (in Chinese).
[4] SHEN D J, LIU C, JIANG J L, et al. Influence of super absorbent polymers on early-age behavior and tensile creep of internal curing high strength concrete[J]. Construction and Building Materials, 2020, 258: 120068.
[5] LURA P, TERRASI G P. Reduction of fire spalling in high-performance concrete by means of superabsorbent polymers and polypropylene fibers: small scale fire tests of carbon fiber reinforced plastic-prestressed self-compacting concrete[J]. Cement and Concrete Composites, 2014, 49: 36-42.
[6] 田园.内养护高强混凝土抗冻融和抗盐冻性能研究[D].郑州:华北水利水电大学,2019.
TIAN Y. Study on freeze-thaw resistance and salt-freezing performance of internal curing high strength concrete[D]. Zhengzhou: North China University of Water Resources and Electric Power, 2019 (in Chinese).
[7] 胡玉庆,邢德进,张敦福,等.复掺高倍吸水树脂与MgO膨胀剂对砂浆性能的影响研究[J].新型建筑材料,2018,45(3):1-3+8.
HU Y Q, XING D J, ZHANG D F, et al. Effect of addition of SAP and magnesia expansive agent on properties of mortar[J]. New Building Materials, 2018, 45(3): 1-3+8 (in Chinese).
[8] 王德志,孟云芳,韩静云.超吸水聚合物内养护对混凝土抗冻性的影响[J].混凝土与水泥制品,2010(1):1-3.
WANG D Z, MENG Y F, HAN J Y. Effects of internal curing caused by super absorbent polymer on the frost resistance[J]. China Concrete and Cement Products, 2010(1): 1-3 (in Chinese).
[9] ESPINOZA-HIJAZIN G, LOPEZ M. Extending internal curing to concrete mixtures with W/C higher than 0.42[J]. Construction and Building Materials, 2011, 25(3): 1236-1242.
[10] 张国防,王亚文,和瑞,等.高吸水性聚合物对水泥砂浆物理力学性能的影响[J].建筑材料学报,2017,20(5):661-666+732.
ZHANG G F, WANG Y W, HE R, et al. Effects of super absorbent polymer on properties of cement mortars[J]. Journal of Building Materials, 2017, 20(5): 661-666+732 (in Chinese).
[11] QIN X, SHEN A Q, LYU Z H, et al. Research on water transport behaviors and hydration characteristics of internal curing pavement concrete[J]. Construction and Building Materials, 2020, 248: 118714.
[12] 刘聪,翁兴中,张俊,等.预应力道面混凝土的弯拉与疲劳特性[J].硅酸盐通报,2019,38(1):211-217.
LIU C, WENG X Z, ZHANG J, et al. Flexural-tensile and fatigue performance of prestressed pavement concrete[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(1): 211-217 (in Chinese).
[13] Standard test method for scaling resistance of concrete surfaces exposed to deicing chemicals ASTM C672—2003[S]. 2003.
[14] 申艳军,张欢,潘佳,等.混凝土界面过渡区微-细观结构识别及形成机制研究进展[J].硅酸盐通报,2020,39(10):3055-3069.
SHEN Y J, ZHANG H, PAN J, et al. Research progress on identification and formation mechanism of microstructures in interface transition zone of concrete[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(10): 3055-3069 (in Chinese).
[15] FANG G H, WANG Q, ZHANG M Z. Micromechanical analysis of interfacial transition zone in alkali-activated fly ash-slag concrete[J]. Cement and Concrete Composites, 2021, 119: 103990.