Sign Up. Upcoming SlideShare. What to Upload to SlideShare. Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Share Email. Top clipped slide. Download Now Download Download to read offline. Bs Dec. The carbonate content shall be expressed as equivalent calcium carbonate content in accordance with the recommendations in BRE Special Digest 1. Additionally, not more than one in ten consecutive samples shall have a grading outside the limits for any one of the gradings C, M or F, given in Table 4.
Alternatively some sands may satisfy the overall limits but may not fall within any one of the additional limits C, M or F. In this case and where sands do not comply with Table 4 an agreed grading envelope may also be used provided that the supplier can satisfy the purchaser that such materials can produce concrete of the required quality. Table 6 — Fines Aggregate type Percentage by mass passing 75 "m sieve max.
Uncrushed, partially crushed, or crushed gravel coarse 2 aggregate Crushed rock aggregate 4 Uncrushed, partially crushed or crushed gravel sand 4 Crushed rock sand 16 9 for use in heavy duty floor finishes Gravel all-in aggregate 3 Crushed rock all-in aggregate 11 NOTE The nature of the fines can vary between different aggregates.
The limits given above are appropriate for most aggregates found in the UK. Evidence of performance in use or the result of trial mixes may be used to justify the adoption of higher or lower limits. Test result information shall be determined in accordance with the relevant Parts of BS If, however, the supplier can show that the typical chloride content of the processed material is less than 0.
For aggregate sources in which the aggregate shrinkage is consistently less than 0. For aggregate sources in which the aggregate shrinkage is consistently 0. The supplier is to notify the purchaser of any changes in production likely to affect the validity of the information given. NOTE The time periods given above are not intended to be used for purposes of assessing compliance with this standard.
Particular attention should be given to the following in addition to complying with the appropriate requirements of this standard. Such tests should be carried out in accordance with the requirements of the appropriate Parts of BS The details of such concrete tests, including mix proportions, type of cement, type and grading of any reference aggregate, the properties of concrete to be determined, the age of test and criteria of acceptance should be agreed between the purchaser and the supplier before the tests are started.
In such cases the only guide is a knowledge of the source and of similar work that has been carried out with the aggregate in question. NOTE 3 Deterioration of building blocks and some other concrete made using mine waste generally known as mundic has occurred in Cornwall and Devon. Chlorides can also be contained in other constituents of concrete.
It is the responsibility of the concrete mix designer to calculate the total chloride content of a concrete mix from the chloride contents of the various constituents and to ensure that an appropriate maximum value is not exceeded. Such maximum values are given in BS , BS and other relevant codes of practice. Table 7 gives guidance on chloride contents for combined aggregates for four categories of concrete.
The use of combined aggregates within the limits in Table 7 will in most circumstances result in concrete complying with BS and BS , but this needs to be confirmed by calculation, using measured chloride values for each of the constituents. Reference is made to combined aggregates because individual aggregates containing levels of chloride in excess of and below those of Table 7 can be blended to produce a combined aggregate having a satisfactory chloride content.
Table 7 — Limits for chloride content of aggregates Type and use of concrete Chloride ion content expressed as percentage by mass of combined aggregate Prestressed concrete and heat-cured concrete 0.
BS , Specification for Portland blastfurnace cements. BS , Test sieves — Technical requirements and testing. BS , Testing aggregates. BS , Methods for sampling. BS Requirements are very similar. There is a new volume stability test for steel slags.
BS , Rolled asphalts and BS , Bitumen macadams are both being amended to suit amended test sieves and changes to mixture designations. They will not be replaced in full until , at the earliest. The specification for Highway Works is also being amended to reflect the UK guidance documents for aggregates. The flakiness index test is also very different. New sieves are need for grading tests. Sand may be described as uncrushed or partially crushed material in a single sample or consignment.
Sand resulting from the natural disintegration of For lightweight aggregates, see BS The titles of the publications referred to in this standard b partially crushed are listed on the inside back cover.
Sand produced from a mixture of uncrushed sand and crushed sand resulting from the crushing of associated particles during product processing. Aggregates finer than 5 mm No requirement 2. It may be produced without When determined in accordance with 6. Concrete made with specially selected aggregate of The oven-dry aggregate impact value shall not a hardness, surface texture and particle shape exceed the appropriate value given in table 2.
Limiting values on mechanical properties for different types of concrete I a hardness, surface texture and particle shape suitable for use in concrete pavements and similar surfaces. Pavement wearing 30 surfaces 4 Quality requirements Others 50 45 4. Aggregate supplied as a mixture of different sizes N U E. BS : Part 1 and BS : Part 1 give guidance on or types shall be proportioned and mixed in such a the acid soluble sulphate content of the concrete from all mix way as to ensure reasonable consistency.
Layer loading of lorries with different sizes or types of materials is unlikely to give the required consistency. For special circumstances,e. NOTE 2. Information on the general factors affecting durability 5. Coarse aggregate Sieve size zyxwvu zyxwvuts zyx Percentage by mass passing BS sieves for nominal sizes Graded aggregates Single-sized aggregate mm 14 mm to 6mm 7 14 m m 10 mm 5 mm' Additionally, not more than When determined in accordance with BS : one in ten consecutive samples shall have a grading Section All-inaggregate shall comply with C or M given in table 4.
Sand 40 mm 20mm I iomm 5 mm' 1- Sieve size Overali Additional limits for grading Individual sands may comply with the requirements of more than one grading.
Alternatively some sands may satisfy '1 Used mainly in precast concrete products. In this case and where sands do not comply with table 4 an agreed grading envelope may also be used provided that the supplier can satisfy the purchaser that such materials can produce concrete of the required aualitv. The nature of the fines can vary between different aggregates.
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