Effect of Low Air Pressure Curing on Performance of Cement Paste

Abstract

Abstract: The problems of strength and durability of concrete materials for infrastructure structures in plateau climate are becoming more and more prominent. It is of great significance to study the influence of plateau climate environment on concrete properties. The low pressure test chamber was used to simulate the air pressure environment of 95.0, 70.7, 57.6, 47.0 and 38.7 kPa, and the performance indicators such as compressive strength, pore structure and phase composition of cement paste under different curing air pressures were tested. The results show that at the same age, with the decrease of curing air pressure, the compressive strength of cement paste decreases and the porosity increases, the most probable pore diameter of the sample increases, the proportion of transition pore decreases, the proportion of capillary pore and macropore increases, and the Ca(OH)₂ in the hydration products of cement paste decreases. In addition, the correlation between the compressive strength of cement paste and pore structure was analyzed, based on the pore structure parameters of cement paste, and the prediction model of compressive strength of cement paste was established.

Key words: low air pressure, cement paste, compressive strength, porosity, pore size distribution, phase composition

CLC Number:

TU528

ZHANG Zhijie, DAI Jinpeng, YANG Xiaoyuan, HE Jie, WANG Qicai. Effect of Low Air Pressure Curing on Performance of Cement Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3439-3444.

References

[1] 刘旭, 陈歆, 田波, 等. 低气压环境下水泥混凝土性能研究进展[J]. 硅酸盐学报, 2021, 49(8): 1743-1752.
LIU X, CHEN X, TIAN B, et al. Cement concrete properties under low atmospheric pressures-a short review[J]. Journal of the Chinese Ceramic Society, 2021, 49(8): 1743-1752 (in Chinese).
[2] XU J Q, ZHU X C, LI M X, et al. Shifts in dry-wet climate regions over China and its related climate factors between 1960—1989 and 1990—2019[J]. Sustainability, 2022, 14(2): 719.
[3] ZUO S H, YUAN Q, HUANG T J, et al. Microstructural changes of young cement paste due to moisture transfer at low air pressures[J]. Cement and Concrete Research, 2023, 164: 107061.
[4] CHEN X, LIU X, TIAN B, et al. Effect of low atmospheric pressure on air entrainment in cement-based materials: an on-site experimental study at different elevations[J]. Materials, 2020, 13(18): 3975.
[5] 李雪峰, 付智, 罗翥, 等. 高原低气压环境对新拌混凝土含气量的影响[J]. 东南大学学报(自然科学版), 2014, 44(5): 1046-1051.
LI X F, FU Z, LUO Z, et al. Effect of low-pressure in plateau environment on air content of fresh concrete[J]. Journal of Southeast University (Natural Science Edition), 2014, 44(5): 1046-1051 (in Chinese).
[6] 李雪峰, 付智. 低气压环境对混凝土含气量及气泡稳定性的影响[J]. 硅酸盐学报, 2015, 43(8): 1076-1082.
LI X F, FU Z. Effect of low-pressure of environment on air content and bubble stability of concrete[J]. Journal of the Chinese Ceramic Society, 2015, 43(8): 1076-1082 (in Chinese).
[7] 李雪峰, 付智. 高原低气压环境对引气混凝土含气量及气泡稳定性的影响[J]. 农业工程学报, 2015, 31(11): 165-172.
LI X F, FU Z. Effect of low atmospheric pressure of plateau environment on air content and bubble stability of air-entrained concrete[J]. Transactions of the Chinese Society of Agricultural Engineering, 2015, 31(11): 165-172 (in Chinese).
[8] LI X F, FU Z, LUO Z. Effect of atmospheric pressure on air content and air void parameters of concrete[J]. Magazine of Concrete Research, 2015, 67(8): 391-400.
[9] 李立辉, 陈歆, 田波, 等. 大气压强对混凝土引气剂引气效果的影响[J]. 建筑材料学报, 2021, 24(4): 866-873.
LI L H, CHEN X, TIAN B, et al. Effect of atmospheric pressure on air-entraining performance of air-entraining agent of concrete[J]. Journal of Building Materials, 2021, 24(4): 866-873 (in Chinese).
[10] ZHANG A, YANG W C, GE Y, et al. Effect of nanomaterials on the mechanical properties and microstructure of cement mortar under low air pressure curing[J]. Construction and Building Materials, 2020, 249: 118787.
[11] ZUO S H, YUAN Q, HUANG T J, et al. Rheology and air entrainment of fresh Portland cement mortars in simulated low air pressure environments[J]. Cement and Concrete Composites, 2023, 135: 104848.
[12] HUO J Y, WANG Z J, ZHANG T H, et al. The evolution of early-age cracking of cement paste cured in low air pressure environment[J]. Journal of Building Engineering, 2022, 52: 104489.
[13] HE R, YANG Z, GAN V J L, et al. Mechanism of nano-silica to enhance the robustness and durability of concrete in low air pressure for sustainable civil infrastructures[J]. Journal of Cleaner Production, 2021, 321: 128783.
[14] SHI Y, YANG H Q, ZHOU S H, et al. Effect of atmospheric pressure on performance of AEA and air entraining concrete[J]. Advances in Materials Science and Engineering, 2018, 2018: 1-7.
[15] HUO J Y, WANG Z J, CHEN H X, et al. Impacts of low atmospheric pressure on properties of cement concrete in plateau areas: a literature review[J]. Materials, 2019, 12(9): 1384.
[16] LIU Z Z, LOU B W, SHA A M, et al. Microstructure characterization of Portland cement pastes influenced by lower curing pressures[J]. Construction and Building Materials, 2019, 227: 116636.
[17] ZENG X H, LAN X L, ZHU H S, et al. Investigation on air-voids structure and compressive strength of concrete at low atmospheric pressure[J]. Cement \& Concrete Composites, 2021, 122: 104139.
[18] 葛昕, 葛勇, 杜渊博, 等. 高原气候条件下混凝土力学性能的研究[J]. 混凝土, 2020(3): 1-4+8.
GE X, GE Y, DU Y B, et al. Mechanical properties of concrete under plateau climate condition[J]. Concrete, 2020(3): 1-4+8 (in Chinese).
[19] GE X, GE Y, LI Q F, et al. Effect of low air pressure on the durability of concrete[J]. Construction and Building Materials, 2018, 187: 830-838.
[20] 葛昕. 高原气候条件对混凝土性能及开裂机制影响的研究[D]. 哈尔滨: 哈尔滨工业大学, 2019.
GE X. Study on the influence of plateau climate conditions on concrete performance and cracking mechanism[D]. Harbin: Harbin Institute of Technology, 2019 (in Chinese).
[21] GE X, GE Y, DU Y B, et al. Effect of low air pressure on mechanical properties and shrinkage of concrete[J]. Magazine of Concrete Research, 2018, 70(18): 919-927.
[22] 李扬, 王振地, 薛成, 等. 高原低气压对道路工程混凝土性能的影响及原因[J]. 中国公路学报, 2021, 34(9): 194-202.
LI Y, WANG Z D, XUE C, et al. Influence of low air pressure on the performance of concrete in road engineering[J]. China Journal of Highway and Transport, 2021, 34(9): 194-202 (in Chinese).
[23] CUI S G, LIU P, CUI E Q, et al. Experimental study on mechanical property and pore structure of concrete for shotcrete use in a hot-dry environment of high geothermal tunnels[J]. Construction and Building Materials, 2018, 173: 124-135.
[24] SANTANA T, GONÇALVES J, PINHO F, et al. Effects of the ratio of porosity to volumetric cement content on the unconfined compressive strength of cement bound fine grained soils[J]. Infrastructures, 2021, 6(7): 96.