Tangent Elastic Modulus Research Articles

Mechanical experiments and constitutive model of natural gas hydrate reservoirs

Natural gas hydrate is a new type of green energy resources and has great development prospects, and it has attracted worldwide attentions. The exploitation of natural gas hydrate may result in a series of geological disasters. Therefore, the constitutive model of natural gas hydrate bearing sediments needs to be established to reveal deformation laws of the reservoir sediments and accurately evaluate mechanical properties of hydrate reservoirs. This is the basic guarantees for the effective exploitation of natural gas hydrate resources. The triaxial compressive tests were conducted on samples of natural gas hydrate sediment. Furthermore, the Duncan-Chang hyperbolic model was modified by considering the influences of hydrate saturation based on the test results to obtain the constitutive model according with the deformation characteristics of natural gas hydrate reservoirs. The results show that the stress-strain curves of natural gas hydrate reservoirs show unobvious compaction stage and peak strength, short elastic stage, long yield stage, and significant strain hardening characteristics. After applying loads on natural gas hydrate bearing sediments, the internal solid particles were dislocated and slid. When the loads were small, the sediments demonstrated elastic deformation. With the increase of loads, plastic flows appeared in the interior, and the hydrate crystals were re-orientated, thus the sediments showing plastic deformation. Initial tangent elastic modulus increased with the effective confining pressures, which had little correlations with hydrate saturation. Furthermore, the damage ratio increases with the increase of effective confining pressures, while slightly decreases with the increase of natural gas hydrate saturation. The predicted results of stress-strain curves of sediments with different hydrate saturations well coincide with the results of triaxial compressive tests, indicting the feasibility and rationality of this model.

Corneal Stiffening by a Bacteriochlorophyll Derivative With Dextran and Near-Infrared Light: Effect of Shortening Irradiation Time up to 1 Minute.

The aim of this study is to determine the effect of variation of the exposure time of near-infrared irradiation on corneal stiffening after a bacteriochlorophyll derivative (WST11) with dextran (WST-D) application. One hundred four paired eyes of 3-month-old New Zealand White rabbits were included in this study. Fifty-two eyes (ex vivo n = 34, in vivo n = 18) were mechanically deepithelialized, treated topically with WST-D, and irradiated at 10 mW/cm using a diode laser at 755 nm for 1, 5, or 30 minutes. Untreated fellow eyes served as controls. Corneoscleral rings were removed immediately after treatment (ex vivo), or 1 month after treatment (in vivo). Corneal strips were cut and underwent biomechanical stress-strain measurements. Ex vivo, the mean tangent elastic modulus was significantly higher in the treatment groups than in the control groups for 1, 5, and 30 minutes of irradiation, respectively, 6.06 MPa, 95% confidence interval (CI, 4.5-7.6) versus 14.02 MPa, 95% CI (10.2-17.8), n = 11, 4.8 MPa, 95% CI (3.9-5.7) versus 15.03 MPa, 95% CI (12-18.1), n = 11, and 7.8 MPa, 95% CI (5.6-10.02) versus 16.2 MPa, 95% CI (13.6-18.9), n = 11; P < 0.001 for all comparisons. In vivo, the mean elastic moduli in the treatment groups were significantly higher for 5 and 30 minutes of irradiation but not for 1 minute of irradiation, respectively, 11.4 MPa, 95% CI (8.5-14.2), versus 17.1 MPa, 95% CI (14.5-19.7), n = 5; P < 0.001, and 9.4 MPa, 95% CI (5.1-13.8) versus 16 MPa, 95% CI (13.1-19), n = 5; P < 0.01, and 11.3 MPa, 95% CI (6-16.6) versus 12.2 MPa, 95% CI (7.5-16.8), n = 5; P = 0.7. WST-D/near-infrared treatment using shortened irradiation time (1 minute ex vivo and 5 minutes in vivo) results in significant corneal stiffening, and this might provide an alternative to the currently applied riboflavin/ultraviolet A cross-linking.

Effect of fiber reinforcement on deformability properties of cemented sand

In this study, a series of unconfined compression tests have been performed to determine the effect of polyvinyl alcohol (PVA) fiber inclusion on deformation characteristics of cemented sand. The cement contents were 2, 4, and 6% by weight of the dry sand and samples were cured for 7 days. PVA fibers with a length of 12 mm and a diameter of 0.1 mm were added to sand-cement mixtures at a weight ratio of 0.0%, 0.3%, 0.6% and 1% (dry wt.). The compression stress-axial strain, secant modulus of elasticity (E50), tangent modulus of elasticity (Etan), failure mode, energy absorption capacity (EA), energy base index, strain base index, deformability index and axial strain at peak strength of the samples were described. Tests results show that addition of cement to sand increased stiffness and unconfined compression strength (UCS), and leading to a brittle behavior. Moreover, addition of PVA fibers to cemented sand increased the UCS and axial strain at peak strength and increased softening stress after the maximum strength. In addition, the fiber inclusion increases the energy absorption capacity and decreases the secant modulus of elasticity.

Nonlinear elasto-plastic analysis of slack and taut cable structures

This paper presents the geometrically nonlinear analysis of the slack and taut cable structures considering the material inelasticity subjected to self-weight, pretension, and external loads. The finite element procedure is briefly summarized using the Lagrangian formulation associated with isoparametric interpolation polynomials and the Newton---Raphson iterative scheme with incremental load. The simple and efficient method to determine the initial equilibrium state of the slack cable systems under self-weight as well as support motions is presented using the penalty method. The numerical algorithm to evaluate the tangent modulus of elasticity of cable is presented based on the iterative scheme. The accuracy and reliability of the present study are verified by comparing the predictions with those generated by well-reported slack and taut cable structure problems. The effect of the yielding of cable segments on displacements and stresses of cable structures is investigated.

Mechanical properties of rubberised concrete for road side barriers

This paper presents the mechanical properties of rubberized concrete for roadside barriers with the intent to reduce injuries and fatalities during crashes. The test programme involved the preparation of normal strength concretes made out of recycled waste tire rubber. The tire–rubber particles composed of a combination of crumb rubber and fine rubber powder were used to replace 10, 20, 30 and 40% of the total weight of the fine aggregate. The test results indicated considerable reductions in compressive and flexural strengths, and tangential modulus of elasticity. New design guidelines in accordance with the Australian Bridge Design Code AS 5100 for strength and serviceability of rubberized concrete roadside barriers were derived based on the test results. New moment-thrust interaction curves and shear strength equations were derived for the rubberized concrete. It was found that the shear strength is critical compared to the combined moment and axial thrust and the maximum rubber content was 17% max for rubberized concrete.

Characterization of the bioactive and mechanical behavior of dental ceramic/sol–gel derived bioactive glass mixtures

Dental ceramics can be modified by bioactive glasses in order to develop apatite layer on their surface. One of the benefits of such modification is to prolong the lifetime of the fixed dental prosthesis by preventing the formation of secondary caries. Dental ceramic/sol–gel derived bioactive glass mixture is one of the options for this modification. In the current study, mixtures of dental ceramic/bioactive glass with different compositions were successfully produced. To evaluate their bioactive behavior, prepared samples were immersed in a simulated body fluid at various time intervals. The prepared and soaked specimens were characterized using Fourier transform infrared spectroscopy, X-ray diffractometry and scanning electron microscopy. Since bioactive glasses have deleterious effects on the mechanical properties of dental ceramics, 3-point bending tests were used to evaluate the flexural strength, flexural strain, tangent modulus of elasticity and Weibull modulus of the specimens in order to find the optimal relationship between mechanical and bioactive properties.

Determination of the Eshelby tensor in mean-field schemes for evaluation of mechanical properties of elastoplastic composites

The conventional Eshelby solution based mean-field schemes may dramatically over-estimate the stress in composites consisting of elastoplastic matrix and elastic reinforcement particles. A new and rational approach is presented to determine the Eshelby tensor of elastoplastic medium to solve this problem. We assume that, during an increment of loading in the Eshelby problem for an elastoplastic medium (EPM), the mechanical property is homogeneous, isotropic and incrementally linearized, and introduce a reference elastic medium (REM) with the identical configuration and elastic property of the EPM studied. For a purely traction boundary value problem, the distribution of the stress increment as well as the constrained elastic strain increment in the EPM can be approximated with that in the REM if both of them are subjected to exactly identical traction boundary condition. As the surface traction increment induced by the eigenstrain increment in an ellipsoidal subdomain Ω in the EPM is applied to the REM, the Eshelby tensor of the REM, Se, can be easily derived with the regular procedure of the traditional Eshelby problem. Then, the Eshelby tensor for the EPM can easily be obtained as S=[(Le)-1:L]-1:Se:[(Le)-1:L], where Le and L are the elastic and the tangent elastoplastic moduli of the EPM respectively. The developed Eshelby tensor is embedded in the conventional Mori–Tanaka scheme to predict the responses of particulate composites subjected respectively to tensile, shear, combined biaxial tensile and shear, and cyclic tensile-compressive, and non-proportional tensile and shear loadings. The comparison with the results obtained with the approaches using isotropic approximation of the tangent elastic modulus, and with the reference ones obtained with full-field FE analyses showed satisfactory agreement, demonstrating the validity of the proposed approach. The approach to determine the Eshelby tensor for elastoplastic media has the following distinct advantages: (1) it employs the regular anisotropic tangent modulus and has a unified form in both elastic and elastoplastic cases; (2) it can easily be embedded in the conventional mean-field homogenization schemes (MFHs) and used for the analyses of effective properties of composites subjected to complex loading histories; (3) it possesses high computational efficiency, since the Eshelby tensor can be simply computed using the elastic and elastoplastic properties of composites with no need of time-consuming numerical ellipsoidal integral in each increment.

Repeatability of a novel corneal indentation device for corneal biomechanical measurement

The aim of the study was to evaluate the repeatability of a new device for measuring corneal biomechanics. Twenty-nine normal subjects aged 20-28 years (23.4 ± 1.7 years) underwent measurements of corneal stiffness and tangent elastic modulus using a novel corneal indentation device. Corneal topography, axial biometry and Goldmann applanation tonometry were also performed during the visit. Subjects returned after about 1 week, at approximately the same time, and with the corneal biomechanics, corneal topography and Goldmann applanation tonometry measured again. Both the intrasession and intersession repeatability was assessed. Both the corneal stiffness and tangent elastic modulus demonstrated good intrasession repeatability (corneal stiffness: coefficient of variation = 7.32%, intraclass correlation coefficient = 0.75; tangent elastic modulus: coefficient of variation = 7.34%, intraclass correlation coefficient = 0.84). The mean modulus after normalised to normal intraocular pressure of 15.5 mmHg was 0.755 ± 0.159 MPa. There was no significant difference between the two visits (paired t-tests: p > 0.05). The repeatability [1.96 times the standard deviation (S.D.) of the intersession difference] of the corneal stiffness and the tangent elastic modulus was 0.0022 N mm(-1) and 0.197 MPa, respectively. The corneal indentation device has good intrasession and intersession repeatability. It has good potential to measure corneal biomechanics clinically, even at different corneal regions.

NEW DESIGN EQUATIONS FOR ELASTIC MODULUS OF CONCRETE USING MULTI EXPRESSION PROGRAMMING

An innovative multi expression programming (MEP) approach is used to derive new predictive equations for tangent elastic modulus of normal strength concrete (NSC) and high strength concrete (HSC). Similar to several building codes, the modulus of elasticity of NSC and HSC is formulated in terms of concrete compressive strength. Furthermore, a generic model is developed for the estimation of the elastic modulus of both NSC and HSC. Comprehensive databases are gathered from the literature to develop the models. For more verification, a parametric analysis is carried out and discussed. The proposed formulas are found to be accurate for the prediction of the elastic modulus of NSC and HSC. The predictions made by the MEP-based models are more accurate than those obtained by the existing models.

High strength rubberized concrete containing silica fume for the construction of sustainable road side barriers

This paper provides strength and durability test results for rubberized concrete that contains silica fume (microsilica) for road side barriers with the intent to reduce injuries and fatalities during crashes. The test program involved the preparation of normal and high strength concretes made out of recycled waste tire rubber. The high strength was obtained by adding silica fume which enhanced the interfacial transition zone bonding. Tire rubber particles composed of a combination of crumb rubber and fine rubber powder were used to replace 10%, 20%, 30%, and 40%, of the total weight of the fine mineral aggregate. The fresh rubberized concrete exhibited lower unit weight and acceptable workability compared to plain concrete. The results of the uniaxial compressive and flexural tests conducted on hardened concrete specimens indicated considerable reductions in axial strength, flexural strength, and tangential modulus of elasticity. Cube Drop tests were performed and showed good resilience of the rubberized concrete. New design guidelines in accordance with the Australian Bridge Design Code AS 5100 for strength and serviceability of rubberized concrete road side barriers were derived based on the test results. New moment–thrust interaction curves and shear strength equations were derived for the rubberized concrete road side barriers. The newly derived design rules showed that shear strength is critical compared to the combined moment and axial thrust and the maximum rubber contents were 17% and 30% for normal and high strength concretes, respectively.

Porous Biodegradable Starch‐Based Polymer: Effects of Plasticizers on the Physical Properties

SummaryThe effect of the plasticizer content (mixture of water and glycerol) on the cellular structure of the considered material and its influence on the resulting properties, such as mechanical stiffness, are investigated by means of optical microscopy, X‐ray diffraction, thermogravimetry and standard mechanical testing. Adding glycerol leads to larger cell walls and smaller pores but it does not significantly affect the elastic tangent modulus and strength under compression for deformations up to 50%; only a tendency to promote elastic recovery is observed.

Computation of effective behavior of isotropic transverse composite in nonlinear problems

Computational homogenization is demonstrated as a potential analysis tool that can be used directly to predict the property structure relationships of many existing classes of composites. Based on finite element simulations, using the Zebulon structures calculation code, the present study is devoted to computation and estimation the effective behavior of the nonlinear composite materials with randomly identical elastic perfectly plastic parallel cylindrical fibers distribution in linear elastic matrix phase. The parameters of effective behavior of the composite will be expressed. These parameters are the effective elastic tangent modulus, effective plastic tangent modulus and effective yield stress. The proposed method can be readily applied to compute the parameters of effective behavior composite, using a new proposed analytical expression based on the volume fraction and effective Young's modulus of each component. A good agreement between expression and simulation results is observed. Several examples are shown.

The relation between hydration and mechanical behavior of bovine cornea in tension

The cornea is a transparent soft tissue covering the front of the eye. The biomechanical properties of the cornea have been commonly investigated by uniaxial tensile and inflation testing methods. The cornea like many other hydrated tissue swells when immersed in an ionic solution. Previous studies on hydrated tissues have shown that mechanical properties and hydration are closely related. The present study was designed to investigate the effects of thickness (hydration) variation due to swelling/dehydration on non-linear stress–strain response of the bovine cornea. Corneal strips were first air-dried and then soaked in a bathing solution until they reached an average thickness ranging from 0.3mm to 1.1mm. Based on their thickness, the samples were divided into different groups and uniaxial tests were performed to measure tensile properties. All experiments were done in mineral oil to prevent any hydration gain or loss during the tests. It was observed that swollen corneas had softer tensile properties in comparison with dehydrated ones. In particular, there was a significant difference between elastic tangent modulus of different groups (P<0.05). It was also shown that tensile behavior of bovine strips at any thickness within the range of 0.4–1.1mm can be obtained from a single experiment conducted on samples with known thickness (hydration). The findings of the present study confirm that mechanical properties obtained from uniaxial tensile experiments are strongly dependent on thickness (water amount) of samples; therefore, careful attention must be taken in interpreting previous studies which did not fully control the thickness of specimens.

A Characteristic of Deformation and Strength of Domestic Sands by Triaxial Compression Tests

본 연구에서는 국내 모래의 공학적 특성을 파악하기 위하여 표준사, 욕지사, 낙동강사를 이용하여 구속압 조건, <TEX>$K_0$</TEX> 조건, 과압밀 조건, 상대밀도 조건을 다르게하여 삼축압축시험을 실시하였다. 삼축압축시험 결과, 변형률 <TEX>${\epsilon}_1$</TEX>에 따른 축차응력 <TEX>$\acute{q}$</TEX>의 변화는 구속압 <TEX>${\sigma}_3$</TEX>와 상대밀도 <TEX>$D_r$</TEX>이 클수록 크게 변화하였으나, <TEX>$K_0$</TEX> 조건과 과압밀 조건변화와 크게 상관이 없었다. 모래의 최대 내부마찰각(<TEX>${\phi}_{max}$</TEX>)은 구속압이 클수록 입자간의 접촉력이 크게 되어 작아지는 경향을 나타내었고, <TEX>$K_0$</TEX> 조건과 과압밀 조건에 따라서는 거의 변화가 없는 것으로 나타났으며, 상대밀도에 따라서는 상대밀도가 감소함에 따라 내부마찰각도 작아지는 경향을 나타내었다. 체적변형률(<TEX>${\epsilon}_u$</TEX>)은 구속압이 클수록 입자의 파쇄성과 입자간의 재배열에 의해 체적 팽창이 작게 나타났으며, <TEX>$K_0$</TEX> 조건과 과압밀 조건에서는 조건에 상관없이 거의 같은 거동을 보였고, 상대밀도에 따라서는 상대밀도가 커질수록 초기에는 압축되다가 축변형률(<TEX>${\epsilon}_1$</TEX>)이 증가할수록 팽창하는 경향이 뚜렷하게 나타났다. 변형률 변화에 따른 탄성계수 <TEX>$E_{sec}$</TEX>는 변형률이 커질수록 차츰 수렴하는 경향을 나타내었고, 축차응력(<TEX>$\acute{q}$</TEX>)-변형률(<TEX>${\epsilon}_1$</TEX>) 관계에서 초기할선 탄성계수(<TEX>$E_{ini}$</TEX>)>할선 탄성계수(<TEX>$E_{sec}$</TEX>)>접선 탄성계수(<TEX>$E_{tan}$</TEX>) 순으로 탄성계수의 크기가 산정되었으며, 구속압 및 상대밀도가 증가함에 따라 탄성계수가 증가하는 경향을 보였고, <TEX>$K_0$</TEX> 및 과압밀에 따라서는 거의 비슷한 탄성계수를 나타내었다. 접선 탄성계수에 의한 정규화에 대해서는 다양한 증가비로 증가하는 경향을 보였다. 한계상태선의 기울기 M은 구속압이 증가함에 따라 감소하는 경향을 나타내었고, <TEX>$K_0$</TEX> 및 구속압, 상대밀도에 따라서는 동일선상에 표현되며, 상대밀도가 증가할수록 한계상태선의 기울기 M도 증가하는 경향을 보였다. This study conducted experiment for understanding engineering characteristics of domestic sands by examining standard sand and sand from Yokji Island and Nakdong River in terms of confining pressure, <TEX>$K_0$</TEX>, over consolidation and relative density factors through triaxial compression test. The test showed that deviator stress by strain positively changed as confining pressure and relative density grow while <TEX>$K_0$</TEX> and over consolidation factors do not directly correlated with it. Angle of internal friction decreases as confining pressure increases which strengthens contact force between particles, and declines as relative density drops, whereas <TEX>$K_0$</TEX> and over consolidation factors hardly affect the results. When it comes to volumetric strain, volume expansion decreases as confining pressure increase due to crushability and rearrangement of particles while <TEX>$K_0$</TEX> and over consolidation shows same movement unconditionally, and relative density appears compressed as it grows at the beginning however it expands as axial strain increases. Modulus of elasticity (<TEX>$E_{sec}$</TEX>) by strain has tendency into convergence resulting in initial secant modulus of elasticity (<TEX>$E_{ini}$</TEX>) > secant modulus of elasticity(<TEX>$E_{sec}$</TEX>) > tangent modulus of elasticity (<TEX>$E_{tan}$</TEX>). On the other hand, it grows as confining pressure and relative density increase while indicating similar modulus of elasticity (<TEX>$E_{sec}$</TEX>) regarding on <TEX>$K_0$</TEX> and over consolidation. Slope of critical line (M) tended to decrease as confining pressure increases, follow same line according to <TEX>$K_0$</TEX>, confining pressure and relative density, and increase as relative density grows.

Multigene Genetic Programming for Estimation of Elastic Modulus of Concrete

This paper presents a new multigene genetic programming (MGGP) approach for estimation of elastic modulus of concrete. The MGGP technique models the elastic modulus behavior by integrating the capabilities of standard genetic programming and classical regression. The main aim is to derive precise relationships between the tangent elastic moduli of normal and high strength concrete and the corresponding compressive strength values. Another important contribution of this study is to develop a generalized prediction model for the elastic moduli of both normal and high strength concrete. Numerous concrete compressive strength test results are obtained from the literature to develop the models. A comprehensive comparative study is conducted to verify the performance of the models. The proposed models perform superior to the existing traditional models, as well as those derived using other powerful soft computing tools.

Numerical Simulation of the Effect of Temperature on the Failure Strength of Rock

The mechanical properties of granite experiencing high temperatures under uniaxial compression condition were simulated in this paper. Numerically simulated stress-strain curve, peak stress, peak strain and the tangent elastic modulus were compared with the corresponding physical tests. Simulated results agree well with physical tests results, it is shown that Abaqus is suitable for the analysis of the temperature effect on rock fracture.

Yielding Phenomena of Aortic Wall and Intramural Collagen Fiber Alignment: Possible Link to Rupture Mechanism of Aortic Aneurysms

Estimation of wall strength of the aortic aneurysms is necessary for the prediction of their rupture risk. We previously found a significant correlation between their tensile strength σMAX and a yielding parameter τσ, which is the stress when tangent elastic modulus reaches at 63% of the plateau level. This may indicate that the wall strength is estimated from their pressure-diameter relationship. Here we show a possible mechanism of the correlation between τσ and σMAX by focusing on alignment of collagen fibers. Thin (150-µm) slices of porcine thoracic aortas were uniaxially stretched in circumferential direction until failure under a microscope, and a retardance, a phase shift when polarized light passes through a birefringent material, was measured as the degree of collagen fiber alignment. Strength σMAX correlated significantly with τσ as obtained previously. The retardance increased with the increase in the stress and reached a plateau at the stress σRet-plateau, indicating that σRet-plateau is the stress at which most of the intramural collagen fibers have aligned. The stress σRet-plateau correlated significantly with τσ and both parameters has similar values. This may indicate that the aortic wall yields when all of collagen fibers become straight. Smaller σRet-plateau means that most collagen fibers are stretched and loaded at smaller stress, resulting in failure at smaller stress. This seems to be a reason for the significant correlation between τσ and σMAX.

동결 온도와 재하속도에 따른 동결토의 일축압축 및 쪼갬인장 강도특성

Recently the world has been suffering from difficulties related to the demand and supply of energy due to the democratic movements sweeping across the Middle East. Consequently, many have turned their attention to never-developed extreme regions such as the polar lands or deep sea, which contain many underground resources. This research investigated the strength and initial elastic modulus values of eternally frozen ground through a uniaxial compression test and indirect tensile test using frozen artificial soil specimens. To ensure accurate test results, a sandymud mixture of standard Jumunjin sand and kaolinite (20% in weight) was used for the specimens in these laboratory tests. Specimen were prepared by varying the water content ratio (7%, 15%, and 20%). Then, the variation in the strength value, depending on the water content, was observed. This research also established three kinds of environments under freezing temperatures of <TEX>$-5^{\circ}C$</TEX>, <TEX>$-10^{\circ}C$</TEX>, and <TEX>$-15^{\circ}C$</TEX>. Then, the variation in the strength value was observed, depending on the freezing environment. In addition, the tests divided the loading rate into 6 phases and observed the variation in the stress-strain ratio, depending on the loading rate. The test data showed that a lower freezing temperature resulted in a larger strength value. An increase in the ice content in the specimen with the increase in the water content ratio influenced the strength value of the specimen. A faster load rate had a greater influence on the uniaxial compression and indirect tensile strengths of a frozen specimen and produced a different strength engineering property through the initial tangential modulus of elasticity. Finally, the long-term strength under a constant water content ratio and freezing temperature was checked by producing stress-strain ratio curves depending on the loading rate.

The Strength and Stress-Strain Behavior of the Cemented Rockfill

The cemented rockfill is mixed with cement, water and the siltstone rockfill with a certain mixing proportion. To study the strength and stress-strain behavior of the cemented rockfill, two groups of triaxial tests are carried out under the saturated and consolidated-drained conditions. One group specimens don’t include cement while the other group specimens include. The test results show that the cemented rockfill is a kind of elastoplastic material and the structure of the cemented rockfill is forced due to the effect of cementation. Compared with rockfill, the initial tangent elastic modulus, strength and cohesion of the cemented rockfill increase apparently, the residual strength and internal friction angle of the cemented rockfill increase a little, the maximum volume strain of the cemented rockfill decreases apparently.

An estimated prediction of the deformability of mineral wool (MW) slabs under long-term compressive stress

This paper presents the results of testing the strength and deformability of mineral wool slabs used for insulating flat roofs, facades, cast-in-place floors and external basement walls as well as for sound insulation in the floor slabs of buildings. The empirical equations for calculating the stress σ10%, tangential modulus of elasticity E and ultimate relative strain ɛcr (which, when exceeded, causes a considerable strain increase) of mineral wool slabs under short-term compression are provided. A regression model of the interrelationship between the predicted pointwise values of creep strains for a lead time of 10years and parameters such as the density, long-term compressive stress σc=0.35·σ10% and ultimate relative strain ɛcr of slabs under short-term compression is suggested.