Thermal deformation and microstructure characteristics of low-heat Portland cement-based concrete in a high plateau environment

Wang, Ning; Luo, Kai; Peng, Ke; Li, Jun; Lu, Zhongyuan; Xia, Yanqing; Lin, Yan; Zhong, Wen

doi:10.1016/j.jobe.2022.105025

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…Ordinary Portland cement (OPC) is one of the typical raw materials for concrete, but it has the following defects: high hydration heat, poor corrosion resistance, and wet and heated curing, so it is not suitable for pouring hydraulic high-volume concrete. Relative to OPC concrete, low-heat Portland cement concrete (LHPCC) has a slower early temperature rise and high late strength, which can effectively reduce the difficulty of temperature control and crack prevention in mass concrete [ 1 , 2 , 3 , 4 ]. However, LHPCC still suffers from poor tensile strength, slight elongation, and high brittleness.…”

Section: Introductionmentioning

confidence: 99%

Macro-Mesoscale Mechanical Properties of Basalt-Polyvinyl Alcohol Hybrid Fiber-Reinforced Low-Heat Portland Cement Concrete

Zheng

2023

Polymers

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To investigate the mechanical properties of hybrid basalt fiber (BF) and polyvinyl alcohol fiber (PVAF)-reinforced low-heat Portland cement concrete (LHPCC), two groups of concrete were formulated. The BF and PVAF were equal in the first group, and the total fiber contents were 0–0.4%. The second group was the total fiber content of 0.3% and the occupancy of BF in the hybrid fiber of 0, 25%, 50%, 75%, and 100%. Two groups of concrete were tested for compressive, splitting tensile, and flexural strengths to illustrate the enhanced mechanism of the mechanical properties of LHPCC by hybrid fiber. The best mechanical property enhancement was achieved when BF and PVAF were in equal proportions and the fiber content was 0.3%. Meanwhile, the test results for the mechanical properties were also compared with the predicted values of ACI 318 and Eurocode 2. Moreover, the hybrid BF-PVAF-reinforced concrete was regarded as a three-phase composite material consisting of fiber-reinforced mortar, coarse aggregate, and an interfacial transition zone. The axial compressive and splitting tensile strengths, damage processes, and mechanical strengthening mechanisms of concrete were investigated for different total fiber content at equal ratios of BF and PVAF, and the results were compared with the macroscopic mechanical test findings. The results show that the conclusion of the meso-simulation matches well with the test. Finally, the effect of aggregate and hybrid fiber content on the mechanical properties of LHPCC was predicted by a simulation. The results of this study can provide references for future mechanical modeling, performance studies, and practical engineering applications of LHPCC.

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Section: Introductionmentioning

confidence: 99%

Macro-Mesoscale Mechanical Properties of Basalt-Polyvinyl Alcohol Hybrid Fiber-Reinforced Low-Heat Portland Cement Concrete

Zheng

2023

Polymers

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“…Owing to the rapid development of western China, infrastructure construction in high-altitude areas is increasing. However, the distinct environmental conditions [20] (low air pressure and large temperature variation) in high-altitude areas significantly affect the hydration characteristics of OPC and reduce the compressive strength and durability of concrete [21,22], thereby affecting the engineering life.…”

Section: Introductionmentioning

confidence: 99%

Physical Properties and Hydration Characteristics of Low-Heat Portland Cement at High-Altitude

Wang

Liu²,

Xia

et al. 2023

Materials

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High-altitude environments are characterized by low air pressures and temperature variations. Low-heat Portland cement (PLH) is a more energy-efficient alternative to ordinary Portland cement (OPC); however, the hydration properties of PLH at high altitudes have not been previously investigated. Therefore, in this study, the mechanical strengths and levels of the drying shrinkage of PLH mortars under standard, low-air-pressure (LP), and low-air-pressure and variable-temperature (LPT) conditions were evaluated and compared. In addition, the hydration characteristics, pore size distributions, and C-S-H Ca/Si ratio of the PLH pastes under different curing conditions were explored using X-ray diffraction (XRD), thermogravimetric analysis (TG), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). Compared with that of the PLH mortar cured under the standard conditions, the compressive strength of the PLH mortar cured under the LPT conditions was higher at an early curing stage but lower at a later curing stage. In addition, drying shrinkage under the LPT conditions developed rapidly at an early stage but slowly at a later stage. Moreover, the characteristic peaks of ettringite (AFt) were not observed in the XRD pattern after curing for 28 d, and AFt transformed into AFm under the LPT conditions. The pore size distribution characteristics of the specimens cured under the LPT conditions deteriorated, which was related to water evaporation and micro-crack formation at low air pressures. The low pressure hindered the reaction between belite and water, which contributed to a significant change in the C-S-H Ca/Si ratio in the early curing stage in the LPT environment.

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Chloride corrosion resistance of manufactured sand reinforced concrete prepared in plateau environment

Guo,

Chen,

Meng

et al. 2024

Case Studies in Construction Materials

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Thermal deformation and microstructure characteristics of low-heat Portland cement-based concrete in a high plateau environment

Cited by 4 publications

References 29 publications

Macro-Mesoscale Mechanical Properties of Basalt-Polyvinyl Alcohol Hybrid Fiber-Reinforced Low-Heat Portland Cement Concrete

Macro-Mesoscale Mechanical Properties of Basalt-Polyvinyl Alcohol Hybrid Fiber-Reinforced Low-Heat Portland Cement Concrete

Physical Properties and Hydration Characteristics of Low-Heat Portland Cement at High-Altitude

Chloride corrosion resistance of manufactured sand reinforced concrete prepared in plateau environment

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