DELETEROUS SUBSTANCES IN AGGREGATES Categories of deleterious substances that may be found in aggregates includes i. Impurities- interferes with the hydration of cement. ii. Coating-prevents the devepment of good bond between aggregate and cement paste.
Oct 18, 2020 The substances, who affect harmful physically or chemically on the aggregates, are considered to be deleterious. Commonly deleterious materials are organic matters, dust materials passing through 75 micron sieve, clay lumps, shale, coal iron pyrites, friable particles, chert weak in terms of freezing and thawing, etc. which are weak, soft ...
Table 4 lists the deleterious substances in aggregates and their effects on concrete. Table 4 Harmful Material in Aggregate deleterious Substances Effect on Portland cement concrete Organic impurities May delay setting and hardening of concrete, may reduce strength gain, and
Step 1 of 3. Typical deleterious materials in aggregates that affect Portland cement concrete are described below Organic impurities These impurities delay the settling time of concrete. Clay and fine particles These particles obstruct the bond formation in between the cement paste and coarse aggregates which affects the strength and ...
Section 904.03 includes a general statement regarding deleterious substances that applies to all classes of coarse aggregates. Section 904.03 also details more specific restrictions for other harmful substances as a maximum allowable percentage of the mass of each of the deleterious materials in a total sample of aggregates being tested. Figure 4-1
The limits for deleterious material and soundness specified in B and C below will be waived for aggregate used in structures or portions of structures not exposed to the weather. B. Deleterious Substances. Meet the deleterious material limits in Table 701-3. 378
Section 904.03 includes a general statement regarding deleterious substances that applies to all classes of coarse aggregates. Section 904.03 also details more specific restrictions for other harmful substances as a maximum allowable percentage of the mass of each of the deleterious materials in a total sample of aggregates being tested.
Specifications for concrete aggregate are contained in Concrete Specifications Section 06005 Ready Mixed Concrete . Plaster Sand The aggregate shall consist of fine granular material composed of hard, strong, durable mineral particles which are free of injurious amounts of saline, alkaline, organic or other deleterious substances.
c Deleterious Substances. Subsection 1116.2a.4, as applicable. d Uniformity of Supply. Designate or determine the fineness modulus grading factor for each aggregate according to the procedure listed in Section 5.10.5-Fineness Modulus of Aggregates Gradation Factor of Part V before delivery, or from the first 10 samples tested and ...
.4 Supply and placement of concrete on the structure headslopes for slope protection to the required ... matter or other injurious substances. Coarse aggregate shall be clean and free from alkali, organic or ... loam or other deleterious substances.
Use with Basic Aggregate to produce Mixed Aggregate If limestone or dolomite aggregates do not comply with Class 2 in subsection 1102.2a.3, the maximum percent retained is 5. c Deleterious Substances. Maximum allowed deleterious substances by weight are
a. Aggregate for base, Type A and B shall be crushed ledgeor crushed gravel of hard durable particles free from vegetable matter, lumps or balls of clay and other deleterious substances. The gradation of the part that passes a 3 sieve shall inch meet the grading requirements of the following table
disintegrated pieces, mud, dirt or other deleterious material and shall be sized to meet the requirements of grading A, Article M.02.06. 2 Bank or crushed gravel shall consist of sound, tough, durable particles of crushed or uncrushed gravel, free from soft, thin, elongated or laminated pieces and vegetable or other deleterious substances.
Provide aggregate that is within 0.20 of the average fineness modulus. 4 Proportioning of Coarse and Fine Aggregate. Use a proven optimization method such as the Shilstone Method or the KU Mix Method. Do not combine siliceous fine aggregate with siliceous coarse aggregate if neither meet the requirements of subsection 2.0c.2a. Consider ...
Deleterious Materials means any products, substances or materials or any combination of them which at the time of specification are specified as deleterious materials in the relevant Appointments or the Building Contract or which otherwise at the time of specification Sample 1. Sample 2. Sample 3. Based on 4 documents.
Beginning with ASTM STP 169C, the subject of aggregate coatings was grouped with soundness and deleterious substances in this chapter. The discussion of coatings by M. A. Ozol in ASTM STP 169B was used as a basis for the inclusion of that subject.
fications limit the permissible amounts of deleterious substances and provide requirements for aggregate char-acteristics. Compliance is determined by using one or more of the several standard tests cited in the following sections and tables. However, the fact that aggregates satisfy ASTM C 33 or AASHTO M 6M 80 requirements
801.02 Deleterious Substances. Material suspected of containing deleterious substances will be examined in the laboratory and will be rejected if the amount is considered objectionable. Coarse aggregate for Portland cement concrete and cover aggregate for bituminous treatment shall be washed and shall be free from adherent coatings.
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 3.0 Material finer than No. 200 sieve - Concrete subject to abrasion
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.
Dosage rates should be veri- fied by tests, such as ASTM C 1567 or ASTM C 1293. Descriptions of aggregate testing and preventive measures to be taken to prevent deleterious alkali- aggregate reaction are discussed later in this chapter under Aggregate Durability , page 47. Table 3-7.
Procedures for Approving Aggregate Sources 53 deleterious substances for each quality class were previously listed in Table 3-8 AASHTO 2015. ... Constructing and maintaining pavements requires an abundant and dependable supply of quality aggregates. Aggregate comes from a wide range of materials, including quarried rock, sand, and gravel, and ...
1 Fine aggregate consists of a combination of sand with fine gravel, crushed gravel, or crushed stone consisting of hard, strong, durable particles. 501.2.5.3.1 Deleterious Substances 1 Do not exceed the following percentages SUBSTANCE PERCENT BY WEIGHT
Some aggregates contain foreign or deleterious substances that make them undesirable for concrete mixtures. Example clay lumps, shale, organic material, etc. The sand-equivalent test, is a method of determining the relative proportion of detrimental fine dust or clay-like materials in the portion of aggregate passing the No. 4 4.75 mm sieve.
and other deleterious substances as well as adherent coating. As far as possible, scoriaceous, flaky and elongated pieces should be avoided. 5.2 Deleterious lVlaterials Aggregate shall not contain any harmful material, such as pyrites, coal, lignite, mica, shale or similar laminated material, clay, alkali, free lime, soft fragments, sea shells
May 11, 2018 Aggregates for concrete, if containing deleterious substances, may affect strength, workability and long term performance of concrete in the long term. These substances or materials are normally referred to as deleterious materials. They are undesirable due to their weakness, softness and fineness or any other physical or chemical characteristics harmful to properties of concrete.
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 size-reduction requirements including, Deleterious materials in aggregate lignite and coal, quarry, aggregate, and different kinds of minerals.
aggregate. Approval of mineral aggregate sources shall be in accordance with 6-2.3. 901-1.2 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.
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 75-micron No. 200 sieve consists of the dust or fracture, essentially free of clay or shale, these limits are permitted to be increased to 5 and
Deleterious Substances. The range of deleterious substance permissible in the fine aggregate as per the ASTM is prescribed in the Table-2 below-Table 2 Deleterious Substance in Fine Aggregate. If the organic impurities exceed the prescribed limits, the aggregates shall be subjected to the test for organic contaminants and producing a ...
DETERMINING DELETERIOUS MATERIAL AND DECANTATION TEST FOR COARSE AGGREGATES BITUMINOUS MIXTURES TXDOT DESIGNATION TEX-217-F MATERIALS AND TESTS DIVISION 2 8 EFFECTIVE DATE JULY 2019 3.6 Pans, scoops, trowels, and other normal laboratory supplies and equipment. 4. PROCEDURE 4.1 Obtain a representative sample of aggregate
deleterious substances, or unusual test results. A copy of these instructions and the ... In section 4, clarified the need to supply 57 size aggregate for concrete aggregate approval. In Appendix A, revised reference to specific tables in R 18. 352015 Changed all instances of Materials Engineer to Materials and Research Division ...
TECHNICALPAPER AREVIEWOFRESEARCHON DELETERIOUSSUBSTANCESINCONCRETEAGGREGATES by RobertL,Schuster, ReseairchAssistant JointHighwayResearchProject ProjectNo,C-2642E ...
DETERMINING DELETERIOUS MATERIAL IN MINERAL AGGREGATE TXDOT DESIGNATION TEX-413-A CONSTRUCTION DIVISION 2 2 LAST REVIEWED SEPTEMBER 2014 fine aggregate, keep the material passing the No. 4 sieve and retained on the No. 16 sieve and test in accordance with ASTM C 142. 4.3 Obtain a sample of approximately 3000 g from the material retained on the 4.75 mm
SECTION 703AGGREGATE 703.1 FINE AGGREGATE a General. 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 such.as reactive chert, gypsum, iron sulfide, amorphous silica and hydra ted iron oxide.