sulfate durability and leaching behaviour of dryand wet

Sulfate durability and leaching behaviour of dry- and wet ...

Nov 01, 2020  Shotcrete is a material frequently used in underground constructions such as tunnels, where Ca leaching and sulfate attack are important durability issues. In this study, two test methods were employed to investigate the sulfate resistance and leaching behaviour of dry- and wet-mix shotcretes in sulfate solutions on a time-resolved basis.

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(PDF) Sulfate durability and leaching behaviour of dry ...

sulfate resistance and leaching behaviour of dry- and wet-mix shotcretes in sulfate solutions on a time-resolved basis. Tests on powdered samples showed the dissolution of AFm, portlandite and C-A ...

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Cement and Concrete Research Vol 137, November 2020 ...

Sulfate durability and leaching behaviour of dry- and wet-mix shotcrete mixes Florian R. Steindl, Isabel Galan, Andre Baldermann, Marlene Sakoparnig, ... Florian Mittermayr

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Durability of concrete exposed to leaching and external ...

Leaching D. Sulfate Resistant Cements C. Expansion Leachingand externalsulphateattack onconcrete leadtodissolution ofhydrationproducts,mainlyportlandite, and in case of ingress of sulphate ions to formation of expansive products such as gypsum and ettringite. Durability ofconcrete exposed tothese environmentsis stillbased on prescriptive ...

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W. KUSTERLE Professor Ostbayerische Technische ...

In this study, two test methods were employed to investigate the sulfate resistance and leaching behaviour of dry- and wet-mix shotcretes in sulfate solutions on a time-resolved basis. Tests on ...

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Maria THUMANN M.Eng. Ostbayerische Technische ...

In this study, two test methods were employed to investigate the sulfate resistance and leaching behaviour of dry- and wet-mix shotcretes in sulfate solutions on a time-resolved basis. Tests on ...

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Lukas BRIENDL Bachelor of Science Graz University of ...

In this study, two test methods were employed to investigate the sulfate resistance and leaching behaviour of dry- and wet-mix shotcretes in sulfate solutions on a time-resolved basis. Tests on ...

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Isabel GALAN PostDoc Position PhD Graz University of ...

In this study, two test methods were employed to investigate the sulfate resistance and leaching behaviour of dry- and wet-mix shotcretes in sulfate solutions on a time-resolved basis. Tests on ...

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Strontium Uptake by Cementitious Materials Environmental ...

Wet chemistry experiments and X-ray absorption fine structure ... Sulfate durability and leaching behaviour of dry- and wet-mix shotcrete mixes. Cement and Concrete Research 2020, 137 , 106180. ... Leaching behaviour of cementitious nuclear wasteforms containing caesium and strontium.

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Sulfate leaching from recovered construction and ...

Aug 01, 2001  A leaching study on the CD debris fines was performed to examine sulfate leachate concentrations resulting from both batch and column leaching experiments. The sulfate concentrations resulting from the batch leaching tests ranged from 890 to 1600 mg/l. The results of the column leaching tests also resulted in high sulfate concentrations.

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Three-dimensional reconstruction and sulfate ions ...

Jul 12, 2021  Fig. 10 (a) and (b) show the variation curve of sulfate ions content in cement paste with 0.4 water-cement ratio under dry-wet cycles and sulfate attack. It was observed that the sulfate ions content increased at different corrosion depth with the increase of corrosion ages under 5% and 10% Na 2 SO 4 solution. In addition, at the corrosion of ...

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Effects of dry-wet cycles on mechanical and leaching ...

Jan 06, 2021  After ten dry-wet cycles, the leaching concentration with an initial Zn 2+ concentration of 1.0 is significantly higher than that of 0.1, indicating that the initial heavy metal concentration can significantly affect the dry-wet cycle durability of solidified soil.. Figure 2a shows that the Zn 2+ concentration in the leaching solution of F0, F10, F20, and F30 is increased by 24, 14, 30, and 7 ...

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‪Isabel Galan‬ - ‪Google Scholar‬

Sulfate durability and leaching behaviour of dry-and wet-mix shotcrete mixes FR Steindl, I Galan, A Baldermann, M Sakoparnig, L Briendl, J Juhart, ... Cement and Concrete Research 137, 106180 , 2020

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Mineralogical alterations that affect the durability and ...

Sep 01, 1999  Evaluations of durability commonly rely on the American Society for Testing and Materials (ASTM) standardized wet/dry and freeze/thaw cycling tests, as well as unconfined compressive strength tests 2, 3. However, the resistance of concrete to attack by chemical or physical agents is not necessarily related to its mechanical strength.

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ENGINEERING BEHAVIOR OF STABILIZED SOILS

Durability testing procedures included freeze-thaw, wet-dry, and leach testing. Atterberg limits and strength tests also were conducted before and after selected durability tests. Changes in pH were monitored during leaching. Relative values of soil stiffness were tracked over a 28-day curing period using the soil stiffness gauge.

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Sulfate Scientific.Net

Based on the previous experimental study on the durability of concrete affected by the factors of both multiple salts and dry-wet cycles, different salts (bicarbonate, sulfate, and chloride salt) soak and dry-wet cycle tests to normal strength concrete (NSC) are conducted in this article.

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RELEVANCE OF DURABILITY TESTING OF SHALES TO FIELD

slake, cyclic wet-dry, and cyclic rate of slaking durability tests. The coarse component consisted of 1.5- to 2-in fragments; the fine component ranged in size from 0.25 to 0.75 in in diameter. Samples pre­ pared for the physicochemical testing were generally crushed at the natural water content to the required

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Leaching of Carbon Reinforced Concrete Part 1 ...

Oct 02, 2020  laboratory leaching tests are not appropriate methods to consider these factors. The disregarding may lead to an over- or underestimation of the real leachate concentrations, depending on the composition of the building material [9,11,13,15,21]. In this paper, investigations concerning the leaching behavior of carbon textile reinforced concrete

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An accelerated sulfate resistance test for concrete ...

The sulfate resistance of concrete was tested using drying-immersion cycles of varying duration in different sulfate solutions. The measured expansion in the different protocols showed a correlation to the sulfate profiles in the test specimens determined by EDX. Based on the magnitude of expansion and the test duration, a suitable protocol for testing job-site concrete was identified.

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Cyclic drying and wetting tests on combined remediation of ...

Jun 02, 2021  Studies found that the proper blending of bentonite enhances the dry and wet durability of the solidified body, while the excessive blending of bentonite reduces it. ... on the leaching behavior ...

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Solidification-stabilization Of Sludge and Ash From ...

The durability of the final products was low; no product sur- vived the full 12 cycles of the wet-dry or freeze-thaw testing (Table 5). The leaching procedure used in this testing program was designed to con- trol many of the factors that affect leach- ing rates, such as surface area, leaching time, waste-to-leaching-fluid ratio, and loss of ...

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IMBT-TVFA - 2020

Florian R. Steindl, Isabel Galan, Andre Baldermann, Marlene Sakoparnig, Lukas Briendl, Joachim Juhart, Maria Thumann, Martin Dietzel, Rudolf Röck, Wolfgang Kusterle and Florian Mittermayr Sulfate durability and leaching behaviour of dry- and wet-mix shotcrete mixes

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Effect of dry–wet ratio on pore-structure characteristics ...

Apr 19, 2021  The durability of engineering structures is an important subject in civil, hydraulic, and traffic engineering. Sulfate is one of the most serious factors affecting concrete durability [1, 2].The soil in northwestern China is rich in SO 4 2−, For example, the sulfate ion concentration in the Chaerhan Salt Lake in Qinghai Province exceeds 4020 mg/L, and the sulfate ion concentration in the ...

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UG-Mat Foundry Sand Recycled Materials Resource Center

Spent foundry sand has good durability characteristics as measured by low Micro-Deval abrasion (23) and magnesium sulfate soundness loss tests. (24) The Micro-Deval abrasion test is an attrition/abrasion test where a sample of the fine aggregate is placed in a stainless steel jar with water and steel bearings and rotated at 100 rpm for 15 minutes.

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Cyclic drying and wetting tests on combined remediation of ...

Jun 02, 2021  Studies found that the proper blending of bentonite enhances the dry and wet durability of the solidified body, while the excessive blending of bentonite reduces it. ... on the leaching behavior ...

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RELEVANCE OF DURABILITY TESTING OF SHALES TO FIELD

slake, cyclic wet-dry, and cyclic rate of slaking durability tests. The coarse component consisted of 1.5- to 2-in fragments; the fine component ranged in size from 0.25 to 0.75 in in diameter. Samples pre­ pared for the physicochemical testing were generally crushed at the natural water content to the required

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Experimental and modeling study on the triaxial mechanical ...

Sep 16, 2020  Considering the significance of sulfate attack to structure durability and frequent existence of multiaxial loadings, it is relevant to study the triaxial mechanical behavior of sulfate-deteriorated cementitious materials. The triaxial compression tests with three confining pressures were conducted in previous study. To give a reliable constitutive model, this research investigated the ...

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Characterization and pH Dependent Leaching Behavior of ...

Sep 08, 2016  Characterization of waste. Leaching behaviour tests. Influence of pH on leaching with continuous pH-control, 2006. [19] CEN 12457-2, Characterization of waste-leaching-compliance test for leaching of granular waste materials and sludges-Part2: one stage batch test at a liquid to solid ratio of 10 l/kg for materials with particle size below 4mm ...

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Mechanical Properties of Cement Mortar after Dry–Wet ...

The dry–wet cycle and high temperature exposure are important factors affecting the normal use and durability of concrete structures. The objective of this work is to investigate the mechanical properties of cement mortar specimens after combinations of dry–wet cycles and high temperature exposures, uniaxial compressive tests on cement mortar specimens were carried out under the following ...

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WM2013 Conference, February 24 – 28, 2013, Phoenix ...

external sulfate attack, carbonation, and primary constituent leaching phenomena [3-6, 8, 11-12]. Based on these components, the CBP has developed a suite of software for simulating reactive transport in cementitious materials and certain degradation phenomena named the

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Influence of Initial Damage Degree on the Degradation of ...

Aug 03, 2020  The previous researches on the degradation process of concrete under sulfate attack mainly focus on non-damaged concrete. It may lead to an excessive evaluation of the durability of the structure, which is detrimental to the safety of the structure. In this paper, three different damage degrees of concrete specimens with non-damaged (D0) and initial damage of 10% (D1) and 20% (D2) were ...

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The Use of Bottom Ash in Highway Embankments, Subgrades ...

performing leaching tests outlined in the EP toxicity test and an Indiana leaching method. Chemical analysis of the leachates showed that bottom ash is nonhazardous, and its effects on the quality of'ground water are minimal. I 17. Key Cord. , bottom ash, boiler slag, waste materials, highway materials, embankment, pavement,

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Engineering behaviour of lime- and waste ceramic dust ...

Dec 04, 2019  Numerous distresses in pavement structures on chemically stabilized expansive soils have raised considerable debate regarding the long-term performance of lime-stabilized subgrades. Therefore, this paper examines the effects of continuous leaching on the durability of lime- and waste ceramic dust (WCD)-stabilized expansive subgrades. The tests were performed with different

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Long-Term Behavior and Durability of Alkali-Activated Clay ...

The inadequate behavior of PO mortar at wet–dry cycles is a concern that should be further examined. However, the maintenance of its load-bearing capacity even after the completion of durability tests grand this mortar as a suitable building material and the specific activator very promising in order to allow further development of new ...

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Creep, Shrinkage and Durability Mechanics of Concrete and ...

CREEP, SHRINKAGE AND DURABILITY MECHANICS OF CONCRETE AND CONCRETE STRUCTURES contains the keynote lectures, technical reports and contributed papers presented at the Eighth International Conference on Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP8, Ise-shima, Japan, 30 September - 2 October 2008). The topics covered

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Physical Properties and Leach Testing Of Solidified ...

v>EPA United States Environmental Protection Agency Municipal Environmental Researc Laboratory Cincinnati OH 45268 Research and Development EPA-600/S2-81-116 Aug. 1981 Project Summary Physical Properties and Leach Testing of Solidified/Stabilized Flue Gas Cleaning Wastes This study examines the effective- ness of five methods of treating flue gas cleaning (FGC) wastes to restrict the

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Leachability of radium-226 from industrial phosphogypsum ...

Feb 02, 2018  The physical treatment based on the particle size separation (dry and wet fractionation) showed that high enrichment factors (Q) of Ra-226 and Pb-210 obtained by the wet fractionation. The Q value for Ra-226 and Pb-210 was 3.1 and 3.9, respectively, compared to the PG bulk. In the chemical treatment carried out by different leaching techniques ...

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