reduce sulphate content in aggregates


  • Sulfate Attack

    Sulfate resisting cements have a C 3 A content below 3% or blast furnace slag content in the binder exceeds 70%. The other mitigation method is to reduce the Ca(OH) 2 content in concrete by applying blended cements in which the pozzolanic reaction decreases the calcium hydroxide amount.

  • Limiting total internal sulphates in 15–75 MPa concrete …

     · Mix proportions have a significant effect on the total SO 3 content in concrete, when represented as a percentage by weight of cement. For example, from Table 3, it can be seen that for mixes with SO 3 content of 2.0% by weight of sand, lean and low strength mixes as N1520 or N2520 contained total SO 3 by weight of cement of 10.6% and 8.0% respectively, while corresponding rich …

  • Standing Committee on Concrete Technology

    5.2 The acid soluble sulphate content of all concrete expressed as SO3 shall be determined in accordance with BS 1881:Part 124:1988 "Method for Analysis of Hardened Concrete" and shall not exceed 4% of total weight of concrete.

  • Sulphate content of fine aggregates

    Sulphate content of fine aggregates Products As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Sulphate content of fine aggregates, …

  • BS 812-118:1988

    This British Standard, a part of the BS 812 series, describes two methods for determining the sulphate content of aggregates. The first method determines the water-soluble sulphate content of aggregates, which applies to natural and synthetic aggregates to be used as drainage materials or for fill or hard core, e.g. unbound road bases or sub-bases or foundations.

  • Innovation for the Use of BUSHGRAVEL and PITSAND as Aggregates for Concrete in Construction Industry

    concrete. High content of harmful compounds (chloride and sulphate, silt or suspended particles) in water retards the setting and hardening of cement. (Dvorkin L. and Dvorkin O.) Organic substances (sugar, industrial wastes, oils, etc.) can also reduce the rate

  • HOW AGGREGATE PROPERTIES AFFECTS CONCRETE …

     · Soundness 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 and strength.

  • Practice Note for Authorized Persons, Registered Structural Engineers and Registered Geotechnical Engineers …

    Use of Recycled Aggregates in Concrete Introduction To reduce the pressure on the demand of public filling and landfill capacity, ... Maximum content of sulphate (% m/m) 1% BS 812: Part 118 Flakiness index 40% BS 812: Section 105.1 10% fines test 0.05 ...

  • (PDF) QCS 2014 Qatar Construction Specifications (Section …

    If the chloride content is higher than 0.01% the following steps may be taken: a- The aggregates may be washed by suitable water (Sec 5 Part 4) before mixing to lower the chloride H content …

  • Correlation analysis between sulphate content and …

    In some recycled aggregates applications, such as component of new concrete or roads, the total content of soluble sulphates should be measured and controlled. Restrictions are usually motivated by the resistance or stability of the new structure, and in most cases, structural concerns can be remedied by the use of techniques such as sulphur-resistant cements. However, environmental risk ...

  • Test for Aggregates for Concrete

     · Balance and weight box Drying oven capable of maintaining a temperature of 105 0 – 110 0 C Saturated solution of sodium sulphate is prepared. And it should be maintained to a temperature of 27.0. ± 2.0 and maintained at least 48 hours before use. Soundness Test Procedure for Fine Aggregates ...

  • sulfate sulphate content aggregates washing

     · sulfate 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 …»More detailed

  • Spalling Concrete

    3. Use silica free aggregates. 4. Increase fire safety of the building to reduce the spalling damage by fire. 5. Adopt correct mix design ratio of concrete. 6. Use vibrators for proper compaction. 7. Use sulphate resisting cement in the mix. 8. To avoid corrosion in 9.

  • Sulphate Attack on Concrete

     · Main factors affecting sulphate attack are: 1. Type of Cement and its Content. The most important mineralogical phases of cement that affect the intensity of sulphate attack are: C3A, C3S/C2S ratio and C4AF. 2. Fly ash addition. The addition of a pozzolanic admixture such as fly ash reduces the C3A content of cement.

  • Reduce Sulphate Content In Aggregates

    Reduce Sulphate Content In Aggregates Aggregates of specified size are subjected to cycles of alternate wetting in a saturated solution of either sodium sulphate or magnesium sulphate for 16 18 hours and then dried in oven at 105 to 110 0 c to a constant weight.After five cycles, the loss in weight of aggregates is determined by sieving out all undersized particles and weighing.

  • Chloride and sulphate content test of aggregate-Henan …

    Home Chloride and sulphate content test of aggregate Chloride and sulphate content test of aggregate Integrity based quality foremost 40 Years experiance 160 Senior R&D Engineer 1600 First-line mechanic 200 Professional service personnel ...

  • An Overview on Sulfate Attack

    An Overview on Sulfate Attack. A concrete structure exposed to a rich sulfate environment or contained sulfate salts in its mix constituents (water, aggregates, or cement) can degrade rapidly and causes reduction of strength. Sulfate with the presence of water and cementitious paste will result in a process called Sulfate Attack.

  • IS 2386-2 (1963): Methods of test for aggregates for concrete, …

    Test for Aggregates for Concrete ( IS : 2386-1963): Part I Part II Part III Part IV Part V Part 11 Part VI I Part VIII Particle Size and Shape Estimation of Deleterious Materials and Organic Impurities Specific Gravity, Density, Voids, Absorption and Bulking 0.3 ...

  • Ref. : WB(W) 209/32/105 27 March 2002

    WBTC 2/2002 Page 1 of 2 Ref. : WB(W) 209/32/105 Group : 5, 12 27 March 2002 Works Bureau Technical Circular 12/2002 Specifications Facilitating the Use of Recycled Aggregates Scope This circular promulgates the particular specifications to

  • INDUSTRY STANDARD FOR CONCRETE SPECIAL CLASS 2002 WSA …

    5.2 CHEMICAL CONTENT Each batch of concrete shall be sampled and the chloride and sulphate content determined in accordance with Clause 5.5 of AS 1379 to the acceptance levels of Clause 2.7 of AS 1379. NOTE: Variations to this requirement may be

  • Alkali-Aggregate Reaction (AAR) of Concrete Structures

    alkali content of concrete, use of low alkali cement, include PFA, GGBS, etc. M2: Avoid the presence of a critical amount of reactive silica, e.g. identify non-reactive aggregate M3: reduce the access of moisture and maintain the concrete in a sufficiently dry

  • chloride and sulphate content test of aggregate

    sulfate sulphate content aggregates washing - … 17/12/2012· sulfate 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

  • Chemical Requirement of Aggregates as per European …

    The water-soluble chloride ion content of aggregates for concrete shall be determined in accordance with EN 1744-1:1998, clause 7, and shall, on request, be declared by the producer. If the water-soluble chloride ion content of the combined aggregate is known to be 0.01 % or lower (e.g., for extracted from most inland quarries), this value can be used in the calculation of the chloride content ...

  • Sulfate in concrete

    Sulfate in concrete Excessive amounts of mobile sulfate, derived from aggregates or other constituents in concrete, can cause disruption due to expansion. BS 8110 part 1 Structural use of concrete, 1985, had a limit of 4% by mass of cement based on the total acid ...

  • Alkali-Aggregate Reaction

    Alkali-Aggregate Reaction. In most concrete, aggregates are more or less chemically inert. However, some aggregates react with the alkali hydroxides in concrete, causing expansion and cracking over a period of many years. This alkali-aggregate reaction has two forms: alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR).

  • ASTM C1524

    C1524-20 Standard Test Method for Water-Extractable Chloride in Aggregate (Soxhlet Method) chloride content~ water extraction~ Soxhlet extractor~ 2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but …

  • Factors Affecting Concrete Mix Design

    When the water content is reducing compared to the cement content, it leads to reducing the water-cement ratio. Reduction in the water-cement ratio increases the strength of the concrete. In this background, one might reduce the cement content to have the same strength while keeping the water-cement ratio unchanged with the addition of a high range water reducer.

  • DETERMINATION OF SOLUBLE SULPHATE CONTENT IN …

     · Determination of Soluble Sulphate Content Purpose Sodium sulphate is present in some soils. The salt is easily hydrated and dehydrated under the influence of climatic changes. There are enormous volume changes during this process of hydration and dehydration, which influence the engineering properties of soils. Procedure Take the soil sample in a state in which […]

  • 6 Types of Deleterious Substances in Aggregate

    🕑 Reading time: 1 minute Deleterious materials in aggregate are those substances which detrimentally effect the fresh and hardened properties of concrete for instance strength, workability, and long-term performance of the concrete in which such are used. Deleterious materials and highly undesirable constituents. Organic impurities, clay, silt and crushed dust, salts, unsound particles, and ...

  • Sulfate attack in concrete

     · The report lists chloride and sulfate content, but I don''t know how to evaluate these numbers because ASTM C 33, "Standard Specification for Concrete Aggregates," doesn''t give limits for them. Where can I get information about permissible levels of chlorides and sulfates in coarse and fine aggregates used in concrete?

  • Buildings | Free Full-Text | Recycled Concrete Aggregates …

    However, durability performances including carbonation, sulphate, and chloride attack resistances decreased when increasing the RCA content beyond 30% replacement level. Finally, although RCA are for the most common practices used in low to normal strength concrete, RCA could also be employed to produce concrete having higher strength (30 MPa and more) and acceptable durability.

  • Sulphate Resisting Cement-Definition, Properties and …

     · The sulphate resisting cement is the cement which has the capability to resist against sulphate attack by introducing low C3A and relatively low C4AF content in the cement. The specification for sulphate cement content should not allow C3A content more than 5 percent. Because of this, you can say that sulphate resisting cement contains more silica.

  • Carbonate Aggregate in Concrete

    aggregates from 15 different sources in Minnesota were investigated. The experimental program included measuring the carbonate content, absorption, …

  • Sulfate Contents In Fine Aggregate To Concrete

    chloride and sulphate content in concrete The chloride content of fresh concrete is calculated by adding together the amounts of acid soluble chloride contributed by each constituent by the formula shown on page 3 Suppliers of manufactured constituents such as ...

  • Aggregates and Soils Testing

    Aggregates and Soils Testing. From our main Laboratory in Poole, Dorset, ACS Group of Companies provide quality testing and material consultancy for the construction and civil engineering industry. Since our initial UKAS Accreditation in 1990, our scope of testing has steadily increased as we are now able to offer a comprehensive range of tests ...

  • Correlation analysis between sulphate content and …

     · It could indicate that other components as natural aggregates, mortars and ceramic particles are providing a portion of the total sulphate content. This is supported by the high level of sulphate observed from the ceramic material B and from the recycled aggregates M5 and M6.

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