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deleterious substances in aggregate

Aggregate in Concrete The Concrete Network

Aggregate in Concrete The Concrete Network

Jan 28 2017 Deleterious Substances in Concrete The substances that are harmful to concrete performance are a Clay lumps and other friable particles b Main reactions of deleterious material Alkali aggregates reaction Alkali silica reaction Alkali carbonates reaction Alkaliaggregate reaction is a term mainly referring to a reaction which occurs a Class 2 aggregate base shall be free of vegetable matter and other deleterious substances Coarse aggregate material contained on the No 4 sieve shall consist of material of which 25 percent by weight shall be crushed particles Class 2 aggregate base shall conform to one of the following gradings determined in accordance with ASTM C136 Coarse aggregate shall consist of crushed stone gravel crushed gravel or other approved inert material of similar characteristics including cinders when specified having hard strong and durable pieces free of clay and other deleterious substances The aggregate shall be washed

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32 11 23 Aggregate Base Course

32 11 23 Aggregate Base Course

Aggregate for untreated base includes a crushed product of stone or coral The aggregate shall be free of vegetable matter and other deleterious substances The aggregate shall be of such nature that the aggregate can readily be compacted under watering and rolling to form a firm stable base TECHNICALPAPER AREVIEWOFRESEARCHON DELETERIOUSSUBSTANCESINCONCRETEAGGREGATES by RobertLSchuster ReseairchAssistant JointHighwayResearchProject ProjectNoC2642E Individual deleterious substances for all aggregates are to be reported to the same number of places shown in the specifications The following is an example of how to compare the sum of the individual deleterious substances with the specified total of all deleterious substances Table 100172

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C Naito Problem 3 What are the deleterious substances in

C Naito Problem 3 What are the deleterious substances in

Jun 02 2021 The percentage of deleterious substances for coarse aggregate is to be determined according to MoDOT TM71 Deleterious Content of Aggregate Where field determinations show a total deleterious content of 25 percent or less including not more than 05 percent shale the deleterious content is to be inspected visually Apr 28 2020 Deleterious Substances Nearly all specifications for aggregate contain a paragraph on deleterious substances which from a production point of view have seemed innocuous because soundness requirements usually suffice Yet this paragraph may be described as a catchall and all requirements under its heading should be considered Approval of mineral aggregate sources shall be in accordance with 623 90112 Deleterious Substances All coarse aggregates shall be reasonably free of clay lumps soft and friable particles salt alkali organic matter adherent coatings and other substances not defined which may possess undesirable characteristics The weight of deleterious

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Solution Deleterious substances in aggregate are

Solution Deleterious substances in aggregate are

Deleterious materials in aggregate lignite and coal Products As a leading global manufacturer of crushing grinding and mining equipments we offer advanced reasonable solutions for any sizereduction requirements including Deleterious materials in aggregate lignite and coal quarry aggregate and different kinds of minerals Dec 01 2014 The amounts of allowable deleterious substances in fine aggregate are described in Table 2 3 Table 2 3 Limits for Deleterious Substances in Fine Aggregate for Concrete Item Mass Percent of Total Sample max Clay lumps and friable particles 30 Material finer than No 200 sieve Concrete subject to abrasion Source Table 1 Limits for Deleterious Substances in Fine Aggregate for Concrete ASTM C 33 In the case of manufactured sand if the material finer than the 75micron No 200 sieve consists of the dust or fracture essentially free of clay or shale these limits are permitted to be increased to 5

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02 Aggregate Gradation

02 Aggregate Gradation

Jun 08 2021 For coarse aggregate for asphaltic concrete plant mix bituminous pavement plant mix bituminous leveling and seal coats Sec 1002 and Sec 1003 the following definitions apply 1063271621 Deleterious Rock Deleterious rock includes the following materials 1 Shaly rock A rock that is generally contaminated with shale to a high degree The allowable percentage of deleterious substances for both fine and coarse aggregate are listed in ASTM C 33 Tables 1 and 3 respectively Some projects might require even morestringent limits To avoid postplacement problems in concrete that are difficult to rectify verify that these limits are not exceeded at the time of material submittals DETERMINING DELETERIOUS MATERIAL AND DECANTATION TEST FOR COARSE AGGREGATES BITUMINOUS MIXTURES TXDOT DESIGNATION TEX217F MATERIALS AND TESTS DIVISION 3 8 EFFECTIVE DATE JULY 2019 P D W 100 Where P Percentage of deleterious matter by weight D Weight of deleterious substances g W Weight of total sample

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Coarse Aggregate Source Approval Policy

Coarse Aggregate Source Approval Policy

Deleterious substances Crushing strength Soft and lightweight particles Chemical stability Gradation Analysis Very little aggregate in the medium size range Lots of different particle sizes thus very little void space CIVL 3137 15 Uniformly Graded Aggregate 0 20 40 60 80 100 Deleterious Substance in Aggregates Deleterious substances can be classified into the following three categories 1 Impurities which interfere with the process of hydration of cement 2 Coatings on aggregates which prevent the development of good bond between aggregate and the cement paste 3 Unsound or weak particle The amount of deleterious substances in aggregate for masonry mortar each determined on independent samples complying with the grading requirements Except as herein provided aggregate subjected to five cycles of the soundness test shall show a loss weighted in accordance with the grading of a sample complying with the limitations set forth

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SECTION 703 AGGREGATES

SECTION 703 AGGREGATES

ODOT Coarse Aggregate Source Approval Policy 1 Scope Aggregates comprise the vast majority of material volume and tonnage in transportation projects Aggregates may have different test requirements and specifications depending on deleterious substances or unusual test results A copy of these instructions and the Jan 29 2018 Deleterious substances in aggregate are undesirable because they may A affect the strength workability and long term performance of concrete B have intrinsic weakness softness and fineness C interfere with the chemical reaction of hydration D All option are correct View Solution C naito problem 3 what are the deleterious substances This preview shows page 4 6 out of 7 pages C Naito Harmful substances that may be present in aggregates include organic impurities silt clay shale iron oxide coal lignite and certain lightweight and soft particles Aggregates are potentially harmful if they contain compounds

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Mineral Aggregate Specifications 911 Metallurgist

Mineral Aggregate Specifications 911 Metallurgist

Specifications which limit the amount of fine material that adheres to coarse aggregates tend to be vague For example the Wisconsin state specifications require coarse aggregates used in portland cement concrete to be free of deleterious substances and adherent coatings however neither the washing procedure nor the desired end result of aggregate washing is specified Aggregate Grading Requirements Fine Natu ral Sand Blend may be used provided the Contractor furnishes test data accepted by the Engineer indicating that clay dirt and other deleterious substances Submit Quality Control Plan QCP wit h detailed process control procedures and type and frequency of sampling and testing For aggregate Fine aggregate is natural or manufactured sand consisting of hard durable and uncoated inert particles reasonably free front clay silt vegetation and other deleterious substances suchas reactive chert gypsum iron sulfide amorphous silica and hydra ted iron oxide Substances that are present in amounts large enough to cause

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