Damage characteristics and thermo-physical properties changes of limestone and sandstone during thermal treatment from −30 °C to 1000 °C

Shen, Yanjun; Yang, Yang; Yang, Gang; Hou, Xin; Ye, Wanjun; You, Zhenyu; Xi, Jiangbo

doi:10.1007/s00231-018-2376-5

Cited by 34 publications

(13 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, some fitting of the properties (obtained from TPS tests) was carried out. Herein, a previous research study on limestone by Shen et al 21 provided some useful insight into the material properties since there was some agreement between the thermal properties presented in the mentioned study and TPS results obtained from this current work. On the basis of the comparison of data, (fitting) effective thermal properties, particularly for the thermal conductivity and specific heat, were developed (Table 5), which provided good agreement with the furnace test result (Fit_sim), see Figure 8.…”

Section: Numerical Investigationssupporting

confidence: 83%

See 1 more Smart Citation

Material properties of clay and lime plaster for structural fire design

et al. 2019

View full text Add to dashboard Cite

Summary Clay and lime plaster are traditional surface finish materials used on historic timber walls and ceilings. Today, hardly any fire technical properties or design parameters exist that consider such plasters as fire protection materials for timber structures. This hinders the fire assessment of existing building structures and disadvantages their use in modern design solutions where healthy and sustainable materials are increasingly favoured. This research follows the safety philosophy of EN 1995‐1‐2 to describe the fire protection ability of plasters. This paper investigates the temperature‐dependent thermal properties of historic plasters by presenting series of material‐specific tests and furnace tests carried out under standard fire exposure conditions. Experimental studies are supported by numerical heat transfer simulations. Results demonstrate particularities between the fire protection ability of clay and lime plaster, however, highlight the need for further investigations in terms of their thermophysical performance and standardisation at the European level. Design parameters are presented and discussed in future perspective. This work demonstrates a basic research to plan and design full‐scale fire tests according to EN 13381‐7:2019.

show abstract

Section: Numerical Investigationssupporting

confidence: 83%

“…As the thermal properties were determined up to 423 C, the properties at higher temperatures were taken constant until 1200 C in the calculations (see Table 5). Herein, a previous research study on limestone by Shen et al 21…”

Section: Lime Plastermentioning

confidence: 99%

Material properties of clay and lime plaster for structural fire design

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Commonly, crack propagation deviates from the boundary of crystals, and then turns to the direction of the maximum of thermal stress rapidly, which causes the fracture surface to be rough for these Griffith's cracks [60]. In addition, the evaporation process of free water, bounded water and structural water existing in the original defects (pores or voids) mainly occurs below the threshold temperature point 400 • C [61]. The water evaporation (seen in Figure 6), happened in the original defects, and provides enough deformation space and aggravates the thermal expansion of mineral particles to be persistent.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, some hard decomposed minerals such as calcite and albite would begin to compose and even melt under elevated temperature conditions beyond 600 °C. In addition, metallic bonds such as Al-O, Na-O, K-O, and Ca-O generally fracture when the temperature increases to 600 °C because of the influence of solid mineral expansion [61].…”

Section: Discussionmentioning

confidence: 99%

Influence of Temperature on the Microstructure Deterioration of Sandstone

et al. 2018

View full text Add to dashboard Cite

Macroscopic properties of sandstone are commonly attributed to the degradation of its microstructure during heating treatment processes. However, few previous studies have focused on comprehensive observations on how the microstructure of sandstone changes with temperature. In this study, a kind of sandstone containing quartz, albite, calcite, and laumontite (little), was collected from Linyi (Shandong Province, China) to observe the microstructure degradation changes with temperature by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and thermo-gravimetric analyses (TGA). Firstly, 10 groups of sandstone samples were heated from 25 • C to 900 • C. Then, some core micro-parameters including lattice constant, full width at half maximum (FWHM), micro-strain, dislocation density, TGA curve changes and failure characteristic of the mineral were analyzed comprehensively. Finally, the underlying mechanism causing the microscopic thermal damage at different temperature intervals was also discussed. The results showed that: (1) quartz, the framework component of this sandstone, underwent an α-to β-phase change over the temperature range from 400 • C to 600 • C. This phenomenon caused the lattice constant, micro-strain, dislocation density and TGA curve to decrease sharply during this interval, leading to the microstructure deterioration of sandstone; (2) calcite underwent a decomposition reaction between 600 • C and 800 • C, and resulted in the XRD pattern peak, lattice constant, micro-strain and TGA curve dropping continuously. It destroyed further the internal microstructure of sandstone and produced numerous inter-granular cracks around quartz crystals; (3) further examination found that the decomposition reactions of minerals presented non-synchronized characteristics due to the different sensitivities of minerals to temperature, which led to thermal stress, thermal fracturing of minerals, and thermal reactions happening in different temperature intervals.

show abstract

“…e unfrozen water content of saturated rock decreases with the decrease of freezing temperature, which has a great influence on the strength and deformation [2]. Shen et al [3] studied the water migration and phase change of sandstone as the two core factors of freezing (20°C ⟶ −30°C) damage. Liu et al [4] concluded that the peak strength of saturated silty mudstone under uniaxial compression has a parabolic relationship with temperature, and the axial strain at peak strength has a linear relationship with temperature.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics of Frozen Sandstone under Lateral Unloading: An Experimental Study

Liu¹,

Yang²,

Dong³

et al. 2021

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

The lateral unloading strength and deformation of surrounding frozen rock are the key parameters for safety evaluation of frozen shaft construction. A low-temperature and high-pressure rock triaxial test system was used to simulate freezing construction, and a constant axial pressure unloading confining pressure test was carried out on frozen sandstone. The effects of freezing temperature, initial confining pressure, and unloading rate on the strength, deformation, and failure modes of frozen sandstone are studied. The main results of the study are as follows: (1) under the initial confining pressure of 20 MPa, the temperature of the sandstone decreases from 20°C to –5°C, and the peak stress and elastic modulus of triaxial compression increase by approximately 3 times. Under lateral unloading conditions, the peak stress of frozen sandstone is about 2∼3 times that of 20°C sandstone, and the peak strain of 20°C sandstone is smaller than that of frozen sandstone. The temperature of frozen sandstone decreases and the rate of increase in the peak stress of triaxial compression is slightly less than the rate of increase in the peak stress of lateral unloading. (2) The initial confining pressure of frozen sandstone increases, the growth rate of axial and radial strain increases, the radial strain dominates the failure process, and the lateral unloading strength decreases significantly. (3) The lateral unloading rate of frozen sandstone increases, the peak strength increases, and the axial and radial strain decrease. At a low unloading rate, partial creep deformation occurs. (4) The frozen rock sample undergoes tensile splitting failure under lateral unloading. According to the stress-strain curve of the frozen rock sample, the relationship between changes in the deformation modulus and changes in the confining pressure unloading amount during the unloading process of the rock sample is obtained.

show abstract

Damage characteristics and thermo-physical properties changes of limestone and sandstone during thermal treatment from −30 °C to 1000 °C

Cited by 34 publications

References 61 publications

Material properties of clay and lime plaster for structural fire design

Material properties of clay and lime plaster for structural fire design

Influence of Temperature on the Microstructure Deterioration of Sandstone

Mechanical Characteristics of Frozen Sandstone under Lateral Unloading: An Experimental Study

Contact Info

Product

Resources

About