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reduce sulphate content in aggregates

The problem of internal sulfate attack in concrete is widespread in Iraq and neighboring countries. This is because of the high gypsum content usually present in sand and gravel used in concrete. Specifications usually put upper limits of SO 3 content in cement, aggregate and concrete.

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EFFECTIVE SULFATE CONTENT IN CONCRETE INGREDIENTS

EFFECTIVE SULFATE CONTENT IN CONCRETE INGREDIENTS

The problem of internal sulfate attack in concrete is widespread in Iraq and neighboring countries. This is because of the high gypsum content usually present in sand and gravel used in concrete. Specifications usually put upper limits of SO 3 content in cement, aggregate and concrete.

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Preventing Slump Loss  Concrete Construction Magazine

Preventing Slump Loss Concrete Construction Magazine

Apr 10, 2013018332Aggregate is the first place to look. Aggregates at lower moisture than saturate surface dry SSD conditions when added to the mixer will absorb water during mixing and transporting. Absorption of water by aggregate typically requires a longer time than a quick mix cycle.

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Correlation analysis between sulphate content and leaching

Correlation analysis between sulphate content and leaching

Correlation analysis between sulphate content and leaching of sulphates in recycled aggregates from construction and demolition wastes. Barbudo A1, Galv237n AP, Agrela F, Ayuso J, Jim233nez JR. Author information 1Construction Engineering, University of Cordoba, UCOEd, Leonardo Da Vinci, Campus of Rabanales, 14071 Cordoba, Spain.

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Innovative solutions for the use of high sulfate content

Innovative solutions for the use of high sulfate content

Innovative solutions for the use of high sulfate content materials as aggregates for concrete. ... solutions can be pr oposed to reduce the internal sulphate reaction risk and then t o valorise .

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Sulfate attack in concrete

Sulfate attack in concrete

Sulfate attack in concrete and mortar. Sulfate attack can be external or internal. External due to penetration of sulfates in solution, in groundwater for example, into the concrete from outside. Internal due to a soluble source being incorporated into the concrete at the time of mixing, gypsum in the aggregate, for example. External sulfate attack ...

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Sulfate Contents In Fine Aggregate Fo Concrete   Panola

Sulfate Contents In Fine Aggregate Fo Concrete Panola

There was an optimum sulfate content in fine aggregate at which the Hussain 2008.The optimum gypsum content in his research was 0.5 by weight of fine aggregates where his sulfate ratios were 0.16 0.5 1 1.5 by weight of fine In this study the percentages of sulfate in concrete ingredients are obtained by adding natural. get price

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sulfate sulphate content aggregates washing   BINQ Mining

sulfate sulphate content aggregates washing BINQ Mining

Dec 17, 2012018332Method of reducing the sodium sulfate content of halite. An additional object is to provide a method of lowering the sulfate content of sodium chloride crystal aggregates … Washing on Sulfate Content and … 187More detailed

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A019 03 Sulphate test strips for sulphate content

A019 03 Sulphate test strips for sulphate content

Sulphate test strips, used to determine the sulphate ions in aqueous solutions of sand and fine aggregates. Detection range 200 to 1600 mgl. Pack of 100 strips. Request information

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Sulphate content   Soil testing equipment  Controls

Sulphate content Soil testing equipment Controls

Sulphate test strip, detection range 200 to 1600 mgl. Useful for preliminary assessment of sulphate ions in aqueous solutions. Weight approx. 10 g Laboratory method Ion exchange apparatus BS 13773 Used for determining the sulphate content of ground water and aqueous soil extracts.

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sulphate and chloride specification aggregate

sulphate and chloride specification aggregate

Jan 20 2018183 Discussion and experiments on the limits of chloride sulphate and shell content in marine fine aggregates for concrete Specification for aggregates from natural sources for concrete in 1983 According to the type andor the use of concrete limits of chloride content were given for four categories of concrete 002 for pre stressed

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The combined effect of chlorides and sulphates present in

The combined effect of chlorides and sulphates present in

The combined effect of sulphates present in aggregates and high levels of chloride ions in the mixing water on some properties of concrete was studied. Different amounts of sulphates in sand 0.38, 0.50, 0.75 and 1.0 SO3 with chloride contents in water 50, 750, 1000, 3000 and 6000 p.p.m. as Cl− were used. The compressive strength was lower for concrete with higher sulphate contents at ...

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Guidelines for Treatment of Sulfate Rich Soils and Bases

Guidelines for Treatment of Sulfate Rich Soils and Bases

Treatment of SulfateRich Soils and Bases 33 TxDOT 092005 Section 2 Risk Assessment Sulfate detection prior to specifying and constructing calcium treated soils is the only means of prevention of sulfateinduced heave. The following is a method to estimate the potential risk for sulfate heave on a …

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sulphate contents aggregate and sand

sulphate contents aggregate and sand

sulfate contents in fine aggregate to concrete. The sulfate or sulphate see spelling differences ion is a polyatomic anion with the empirical formula SO2− 4 Sulfate is the spelling recommended by IUPAC but sulphate is used in British English Salts acid derivatives and peroxides of sulfate are widely used in industry Sulfates occur widely in everyday life Sulfates are salts of

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Chloride Content Test For Concrete Structure Durability

Chloride Content Test For Concrete Structure Durability

The permeability of concrete and binding capacity of chloride affect the chloride attack. Type of cement and cement content of concrete also affect the chloride attack. It is necessary to check the trends of origin of chlorides i.e. external source or contaminated sand or aggregates. It is also necessary to check their movement through the ...

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Influence of the sulphate content of recycled aggregates

Influence of the sulphate content of recycled aggregates

Oct 15, 2014018332Therefore, to obtain 2.8 MPa at 7 d, when the acidsoluble sulphate content is under 0.8, ordinary cement can be used CEM II, but for less favourable conditions when the sulphate content is above 0.8 and up to 1.30 according to the results obtained in Fig. 10, CEM II …

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Factors Affecting Workability of Concrete   Civil Engineering

Factors Affecting Workability of Concrete Civil Engineering

Property of cement if alkali content is high and sulfate content is low, sump loss will be greater Moisture content of aggregate dry aggregate will absorb more water and workability will decrease Temperature. High temperature reduces workability and increases slump loss.

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THRESHOLD SULFATE LEVELS IN SOILS   Recommended …

THRESHOLD SULFATE LEVELS IN SOILS Recommended …

The sulfate concentration should be determined based on an accepted specification such as AASHTO T 290 modified, which is discussed later in this report. Table 1 outlines the level of risk associated with stabilizing soils with varying sulfate concentrations 33. Table 1. Level of risk associated with lime stabilization in sulfatebearing clays.

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HOW AGGREGATE PROPERTIES AFFECTS CONCRETE …

HOW AGGREGATE PROPERTIES AFFECTS CONCRETE …

Feb 15, 2019018332Soundness of aggregate for concrete liable to be exposed the action of frost, coarse and fine aggregates should pass a sodium or magnesium sulphate accelerated soundness test. Grading of aggregates Grading of aggregates is an important aspect as they can influence the various properties of concrete such as cohesion, water demand, workability ...

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Analysis of chromium and sulphate origins in construction

Analysis of chromium and sulphate origins in construction

Therefore, the watersoluble sulphate content and Los Angeles abrasion coefficient limits can be increased for recycled aggregates without compromising the quality of this type of road with low ...

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Aggregation of sulphate reducing bacteria and homo

Aggregation of sulphate reducing bacteria and homo

This paper discusses aspects of the formation, growth and detachment of sulphatereducing aggregates, growing on H 2 CO 2 and H 2 CO gas mixtures in a 4.5 L labscale gaslift reactor. The biomass in the aggregates consisted predominantly of Desulfovibrio sp. and Acetobacterium sp.. Our experiments with H 2 CO 2 showed that aggregates with pumice particles, i.e. biofilms, as well as …

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sulfate sulphate content aggregates washing   BINQ Mining

sulfate sulphate content aggregates washing BINQ Mining

Dec 17, 2012018332sulfate sulphate content aggregates washing – Grinding Mill China. sulfate contents in fine aggregate fo concrete Aggregate mining and washing stone Aggregate mining in vietnam … The report lists chloride and sulfate content … 187More detailed

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Microbial sulphate reduction at a low pH   FEMS

Microbial sulphate reduction at a low pH FEMS

The size and shape of aggregates was pHdependent, with larger 2.26 mm diameter and smoother aggregates at pH 5.5. Sulphate reduction was completely inhibited at pH 5 van Houten et al., 1995. Sulphatereducing bacteria growing at pH 2.9 were enriched from acid mine tailings using 10 mmol L −1 glycerol and 0.02 yeast extract as substrates.

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US5928420A   Cement composition for alkali reactive

US5928420A Cement composition for alkali reactive

A combination of a class C fly ash having a high analytical content of CaO, and a silica fume, with a hydraulic cement, such as Portland cement, produces concrete with alkalisilica reactive aggregate having acceptable low expansion such as by ASTM C 1260 and also produces sulphate resistance with mineral aggregates generally.

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Ammonium sulphate fractionation   UCL

Ammonium sulphate fractionation UCL

Ammonium sulphate fractionation. ... will reduce the solubility of the protein. As interactions with water become less marked, so proteinprotein interactions become more important, and the protein will aggregate and come out of solution. Provided that the temperature is maintained low enough around 4C, the protein is not irreversibly ...

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sulfate contents in fine aggregate to concrete

sulfate contents in fine aggregate to concrete

sulphate content of fine aggregates. In the present study effects of replacement of fine aggregate sand with high . fine aggregate with iron slag better sulfate resistance due to lower C3A content. asphalt sand and .. specified for the sulphate content of aggregates for concrete. This is. More details 187 Get Price. Sample Specification For ...

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EFFECTS OF AGGREGATE TYPE  SIZE  AND CONTENT …

EFFECTS OF AGGREGATE TYPE SIZE AND CONTENT …

coarse aggregate content than with lower coarse aggregate contents. The fracture energy of highstrength concrete containing limestone and normalstrength concrete containing basalt is not affected by aggregate content. There is no welldefmed relationship between fracture energy and compressive

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sulphate content of fine aggregates

sulphate content of fine aggregates

Aggregate Properties The Idiots Guide to Highways Maintenance. Below are listed a number of aggregate properties that it is important to have a basic ... a specified fine sieve, at the end of the test, is regarded as abraded aggregate and this loss ..... Part 118 Method for the determination of sulphate content. More details 187 Get Price

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SOUNDNESS TEST OF AGGREGATES  IS 2386 PART 5    …

SOUNDNESS TEST OF AGGREGATES IS 2386 PART 5 …

Jun 19, 2014018332Sodium Sulphate Solution Magnesium Sulphate Solution Preparation of Test Sample For Fine Aggregate. Wet sieve the sample through a nest of IS sieves, the lower being 300 micron and the upper being 10 mm size. The material passing 10 mm sieve and retained on 300 micron sieve is then dried and taken for the test.

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The disintegration of concrete containing sulphate

The disintegration of concrete containing sulphate

May 25, 2015018332Problems related to concreting in the Middle East and similar localities have renewed interest recently in the disintegrating effect of sulphatecontaminated aggregates. The paper describes a research programme initiated to study the influence of sulphatecontaminated fine aggregates upon the strength and volume changes of cement mortars.

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Pyrite Testing explained   IGI

Pyrite Testing explained IGI

aggregates. Magnesium sulphate test 500g of particles in the 10mm to 14mm range Higher the MS value, the less durable the aggregate NRA specification for Clause 804 May 2004 sets a maximum MS value of 25 Test is mainly used to determine susceptibility of an aggregate to degradation by exposure to freezethaw cycles

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Sodium Sulphate Effect on Cement Produced with Building

Sodium Sulphate Effect on Cement Produced with Building

Besides, clinker has free CaO content of 1.005, MP has CaCO 3 content of 94.66 should be gt75 according to the EN 1971, and AP has FeO content of 1.08 and MnO content of 0.10. As shown in Table 2, while the material which contained the highest SiO 2 is DP, MP has the lowest SiO 2.. The pozzolanic reaction comprised the amorphous silica within DP and the calcium hydroxide occured with ...

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DETERMINING CHLORIDE AND SULFATE CONTENTS IN …

DETERMINING CHLORIDE AND SULFATE CONTENTS IN …

chloride and sulfate ions. Note 5—Follow the manufacturer’s recommendation for ion chromatograph operation. 7.5 Obtain chloride and sulfate contents in ppm as determined by the ion chromatograph. Use conversion factors to convert to ppm chloride and sulfate content in the original sample.

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total sulphate content of aggregate

total sulphate content of aggregate

Cement composition for alkalireactive aggregate and for . Jul 27, 1999 183 A combination of a class C fly ash having a high analytical content of CaO, and a silica fume, with a hydraulic cement, such as Portland cement, produces concrete with alkalisilica reactive aggregate having acceptable low expansion such as by ASTM C 1260 and also produces sulphate resistance with mineral aggregates ...

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Sulfate Soundness Test   Pavement Interactive

Sulfate Soundness Test Pavement Interactive

The soundness test determines an aggregate’s resistance to disintegration by weathering and, in particular, freezethaw cycles.. Description. The most common soundness test involves repeatedly submerging an aggregate sample in a saturated solution of sodium or magnesium sulfate. This process causes salt crystals to form in the aggregate pores, which simulate ice crystal formation Figures 1 ...

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sulphate content in the combined aggregate

sulphate content in the combined aggregate

Jan 20, 2018183 Therefore, the limit values of sulphate salt content in Table 2 is not fully specialized for marine aggregates, which is also the reason why Japan and Taiwan who use more marine sand but do not regulate the limit values of sulphate salt content in aggregates in their aggregate standards.

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Standard Test Method for Soundness of Aggregates by Use …

Standard Test Method for Soundness of Aggregates by Use …

4.2 Values for the permittedloss percentage by this test method are usually different for fine and coarse aggregates, and attention is called to the fact that test results by use of the two salts differ considerably and care must be exercised in fixing proper limits in any specifications that include requirements for these tests. The test is usually more severe when magnesium sulfate is used ...

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Sodium Sulphate Effect on Cement Produced with Building

Sodium Sulphate Effect on Cement Produced with Building

Besides, clinker has free CaO content of 1.005, MP has CaCO 3 content of 94.66 should be gt75 according to the EN 1971, and AP has FeO content of 1.08 and MnO content of 0.10. As shown in Table 2, while the material which contained the highest SiO 2 is DP, MP has the lowest SiO 2.. The pozzolanic reaction comprised the amorphous silica within DP and the calcium hydroxide occured with ...

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SuperFlow 20   Aggregate Industries

SuperFlow 20 Aggregate Industries

Aggregate Industries SuperFlow JointAgg is a high performance finishing aggregate specifically designed for brushing into block pavement joints. This aesthetically pleasing product offers excellent free draining characteristics due to its low fines content, while it’s natural strength ensures the long term integrity of the SuDS system is ...

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Pyrite Testing explained   IGI

Pyrite Testing explained IGI

aggregates. Magnesium sulphate test 500g of particles in the 10mm to 14mm range Higher the MS value, the less durable the aggregate NRA specification for Clause 804 May 2004 sets a maximum MS value of 25 Test is mainly used to determine susceptibility of an aggregate to degradation by exposure to freezethaw cycles

Get Price

Correlation analysis between sulphate content and leaching

Correlation analysis between sulphate content and leaching

Correlation analysis between sulphate content and leaching of sulphates in recycled aggregates from construction and demolition wastes. Barbudo A1, Galv237n AP, Agrela F, Ayuso J, Jim233nez JR. Author information 1Construction Engineering, University of Cordoba, UCOEd, Leonardo Da Vinci, Campus of Rabanales, 14071 Cordoba, Spain.

Get Price

sulphate and chloride specification aggregate

sulphate and chloride specification aggregate

Jan 20 2018183 Discussion and experiments on the limits of chloride sulphate and shell content in marine fine aggregates for concrete Specification for aggregates from natural sources for concrete in 1983 According to the type andor the use of concrete limits of chloride content were given for four categories of concrete 002 for pre stressed

Get Price

Standard Test Method for Water Extractable Chloride in

Standard Test Method for Water Extractable Chloride in

3.1 Waterextractable chloride, when present in sufficient amount, has a potential to initiate or accelerate corrosion of metals, such as steel, embedded in or contacting a cementitious system, such as mortar, grout, or concrete. This test method is applicable when aggregates contain a high background of naturally occurring chloride see ACI 222.1–96 .

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reduce sulphate content in aggregates

reduce sulphate content in aggregates

Use of Recycled Concrete Aggregate in PCCP reduce sulphate content in aggregates amp aggregate, using fly ash, blending the RCA with aggregates and using lowalkali cement. Lower strength of mixes made RCA can be overcome by adding water reducing agents, increasing the cement content and as mentioned previously, limiting the amount of recycled fine aggregate in the mix.

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Sulphate Attack on Concrete   Process and Control of

Sulphate Attack on Concrete Process and Control of

Sulphate attack on concrete is a chemical process where sulphate ions attack components of cement paste. Types of sulphate attack amp its control is discussed. ... presence of natural gypsum in the aggregate. Admixtures also can contain small amounts of sulphates. 2. External Sources ... Type of Cement and its Content.

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Sulfate Attack and Sulfate Content in Concrete  A

Sulfate Attack and Sulfate Content in Concrete A

Jan 14, 2017018332Internal sulfate attack occurs when a source of sulfate is incorporated in the concrete when mixing like excess gypsum in cement, sulfate in the aggregate…

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Permissible Levels of Chlorides and Sulfates in Aggregate

Permissible Levels of Chlorides and Sulfates in Aggregate

Feb 01, 1996018332Q. Were designing a concrete structure in Egypt, and I received test results for the aggregate to be used in the concrete. The report lists chloride and sulfate content, but I dont know how to evaluate these numbers because ASTM C 33, quotStandard Specification for Concrete Aggregates,quot doesnt give limits for them.

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Sulfate Attack   an overview   ScienceDirect Topics

Sulfate Attack an overview ScienceDirect Topics

Silica fume is effective in reducing or preventing attack from sodium sulfate, mainly by its role in reducing permeability, as well as reducing the calcium hydroxide content due to pozzolanic reactions Bonen amp Cohen, 1992 Cohen amp Bentur, 1988.

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Preventing Slump Loss  Concrete Construction Magazine

Preventing Slump Loss Concrete Construction Magazine

Apr 10, 2013018332Aggregate is the first place to look. Aggregates at lower moisture than saturate surface dry SSD conditions when added to the mixer will absorb water during mixing and transporting. Absorption of water by aggregate typically requires a longer time than a quick mix cycle.

Get Price

Discussion and experiments on the limits of chloride

Discussion and experiments on the limits of chloride

Jan 20, 2018018332Table 2 shows the limit values of sulphate salt content in natural aggregates recommended in different standards. In this table, sulphate salt content in aggregates is tested by hydrochloric acid dissolution method. Thus, the tested sulphate salt is also called acidsoluble sulphate salt calculated by SO 3 . Additionally, since sulphur in ...

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DETERMINATION OF SOLUBLE SULPHATE CONTENT IN SOIL …

DETERMINATION OF SOLUBLE SULPHATE CONTENT IN SOIL …

May 07, 2015018332Cool in a dessicator, weigh and note the residue. This is the weight of the barium sulphate. Calculate the corresponding weight of sodium sulphate and determine its percentage as follows a Sulphate SO 4 percent by mass 41.15 W 1 W 2. b Sodium Sulphate Na 2 SO 4 percent by mass 60.85 W 1 W 2. Where. W 1 mass in g of the precipitate

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Crusher Gap Setting By Ultrasonic Measurement

Crusher gap setting by ultrasonic measurement 16a method for determining the adjustment of a crusher gap setting andor crusher rate of wear in a gyratory crusher with hydraulic adjustment of the crusher cone height the invention allows measuremen fig 1 is a side view showing a vertical c

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