Study on the evolution of dynamic mechanics properties of cement mortar under sulfate attack

Zhu, Jie; Cao, Yonghui; Chen, Jiangying

doi:10.1016/j.conbuildmat.2013.02.027

Cited by 17 publications

(4 citation statements)

References 29 publications

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“…Moreover, for the samples subjected to high concentrations of sulphate solutions, the variations of the elastic modulus and ultimate strength are more significant in that the mortars suffer more severe sulphate exposure. In addition, compared with the transition time (120 days) reported by Zhu et al, 9 the turning time (less than 90 days) of elastic moduli recorded here was much shorter. This situation confirms that the erosion of mortars under W-D cycles of sulphate attack is much more severe than in immersion conditions.…”

Section: Resultscontrasting

confidence: 56%

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Degradation of mechanical properties of cementitious materials exposed to wet–dry cycles of sulphate solution

Liao

Yang

Jiang

et al. 2015

Materials Research Innovations

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In order to study sulphate attack effects on the mechanical behaviour of cementitious materials, the compressive behaviour of such materials subjected to wet-dry cycles of sulphate solution was investigated. Then, their variation of mass was recorded. According to the experimental results, it was observed that the mortars subjected to wet-dry cycles of sulphate attack were more severely damaged than ones immersed in a sulphate solution. In addition, these experimental results showed that the ultimate strength, elastic moduli and mass of samples initially increased with the number of wet-dry cycles and then declined after a certain number of wet-dry cycles. However, the peak strain corresponding to the compressive strength presented a decrease in the initial stage and then increased with the number of wet-dry cycles. Finally, the relationships between the mechanical behaviours and mass increment of such materials were analysed and qualitatively established.

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Section: Resultscontrasting

confidence: 56%

“…Similarly, immersing mortars in 8% sodium sulphate solution, Zhu et al 9 reported that the elastic moduli of mortars increased in the initial 120 days followed by a decrease stage. They attributed the initial increase in elastic modulus to the nucleation and growth of expansion products such as ettringite crystals.…”

Section: Resultsmentioning

confidence: 97%

Degradation of mechanical properties of cementitious materials exposed to wet–dry cycles of sulphate solution

Liao

Yang

Jiang

et al. 2015

Materials Research Innovations

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“…Based on this, Wang et al proposed an improved Lagrangian analysis method ("nV + T0" for short) based on the path-line method and the zero initial condition, which can directly invert the dynamic stress-strain curves of materials at high strain rates without involving boundary stress, and they used this method to analyze the dynamic mechanical properties of closed-cell aluminum foam materials [135]. Zhu et al used the "lsv + nε" Lagrangian inverse analysis method based on the path-line method in the SHPB test taking the soaking time of cement mortar specimens in an 8% sodium sulfate solution as a variable to obtain the dynamic stress-strain relationship and the changing trend in the dynamic elastic modulus of cement mortar materials under sulfate attack [136]. Zhang et al obtained the stress-strain relationship of concrete materials under impact loading conditions via the Lagrangian analysis method in 2005 [137].…”

Section: Application Of Lagrangian Analysis Methods To Impact Test Of...mentioning

confidence: 99%

Review of SHPB Dynamic Load Impact Test Characteristics and Energy Analysis Methods

Yang,

Li,

Qiao

2023

Processes

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Since the split-Hopkinson pressure bar (SHPB) test technology was proposed, it has played an important role in the study of dynamic mechanical properties of materials under the impact of dynamic load. It is a major test technology for the study of dynamic mechanical properties of materials. The expansion of the range of materials studied has also posed a challenge to the SHPB test technique, requiring some improvements to the conventional SHPB test apparatus and analysis methods to meet the test conditions and ensure the accuracy of its results. Based on a systematic review of the development of the SHPB test technique and the test principles, the main factors that influence the test’s ability to meet the two basic assumptions at this stage are analyzed, and the ways to handle them are summarized. The stress wave dispersion phenomenon caused by the transverse inertia effect of the pressure bar means that the test no longer satisfies the one-dimensional stress wave assumption, while the pulse-shaping technique effectively reduces the wave dispersion phenomenon and also has the effect of achieving constant strain rate loading and promoting the dynamic stress equilibrium of the specimen. Impedance matching between the pressure bar and specimen effectively solves the problem of the test’s difficulty because the transmitted signal is weak, and the assumption that the stress/strain is uniformly distributed along the length of the specimen is not satisfied when studying low-wave impedance material with the conventional SHPB test device. The appropriate pressure bar material can be selected according to the value of the wave impedance of the test material. According to the wave impedance values of different materials, the corresponding suggestions for the selection of pressure bar materials are given. Moreover, a new pressure bar material (modified gypsum) for materials with very-low-wave impedance is proposed. Finally, for some materials (foamed concrete, aluminum honeycomb, porous titanium, etc.) that cannot meet the two basic assumptions of the test, the Lagrangian analysis method can be combined with SHPB test technology application. Based on the analysis and calculation of the energy conservation equation, the dynamic constitutive relationship of the materials can be obtained without assuming the constitutive relationship of the experimental materials.

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“…On this account, investigation of the effect of 5 % water solution of the sodium sulphate and the reference environment of distilled water on changes in mechanical resistance and properties of several commercial ready-mix renders is done in the presented paper. However, one must consider that standards for testing the sulphate resistance have yet to be achieved because of varying views about the sulphate attack and its damage mechanisms, different experimental methods, inconsistent conditions between laboratory and real project conditions, and the lack of studies on change of structural properties due to the sulphate corrosion [21], [22].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Sodium Sulphate Solution Exposure on Properties and Mechanical Resistance of Different Kinds of Renders

Pavlíková¹

2018

Ceramics - Silikaty

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The effect of 5 % water solution of the sodium sulphate and the reference environment of distilled water on changes in mechanical resistance of the commercial dry render mixes was researched in the paper. The prism-shaped specimens cured 28 days in humid and stable conditions were immersed in water or sodium sulphate water solution. At chosen time, the particular specimens were collected, dried to constant mass, and subjected to tests. The maximum time of specimen exposure to moisture or salt action was 168 days. Within the performed experiments, length changes, mass gain, mechanical and basic properties were measured in order to reveal the effect of sulphate corrosion on researched materials. Additionally, pore size distribution measurement and X-Ray CT analysis for the most damaged render were done, in order to characterize the disruptive impact of sulphate solution on porous microstructure of lime-metakaolin-based render. The obtained data revealed the high capacity of porous space of the tested renders for salt storage. For shorter times of exposure to salt action, most of the studied renders exhibited improvement in mechanical resistance. On the other hand, after the full filling of the porous space, the evoked crystallization pressures led to the decrease in mechanical resistance and materials damage. However, one type of studied renders originally designed for restoration of salt laden masonry maintained its excellent mechanical properties even after 168 days of sulphate exposure.

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Study on the evolution of dynamic mechanics properties of cement mortar under sulfate attack

Cited by 17 publications

References 29 publications

Degradation of mechanical properties of cementitious materials exposed to wet–dry cycles of sulphate solution

Degradation of mechanical properties of cementitious materials exposed to wet–dry cycles of sulphate solution

Review of SHPB Dynamic Load Impact Test Characteristics and Energy Analysis Methods

The Effect of the Sodium Sulphate Solution Exposure on Properties and Mechanical Resistance of Different Kinds of Renders

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