Wear a smile and have friends; wear a scowl and have wrinkles. Strive not to be a success, but rather to be of value. Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning. Life is a tragedy when seen in close-up, but a comedy in long-shot. Other Standard. British standard BS Specification for Portland cement. E-Coins fee :.
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Click on stars to rate. Reader Comments. Sort by new comments Sort by old comments Sort by likes. You need is member of groups must can comment this post. Click here to register! 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. The iimits given above are appropriate for most a m g a t e s found in the UK. Evidence of performance in use or the result of triai mixes may be used to justify the adoption of higher or lower limits. Information to be For aggregate sources in which the aggregate shrinkage is consistently 0. Test result information shall be of the information given.
The time periods given above are not intended to be of BS Special considerations zyxwvutsrq zyxwvutsr reference ; Reference should be made to the appropriate 2 county or region; British Standard code of practice for advice on the 3 for materials dredged from the seas, quality of aggregate to be specified for making estuaries or rivers, the address of the wharf at concrete according to its type and use.
The details of such concrete tests, 7 water absorption values; including mix proportions, type of cement, type Data provided from test results is to be not and grading of any reference aggregate, the more than one year old for properties of concrete to be determined, the age properties 6 and 7. In such cases the only guide is a 10 and The grading of sand is to be knowledge of the source and of similar work that described and if the sand is substantially less has been carried out with the aggregate in variable than either C , M or F of table 4,the question.
NUTE 1. Advice on drying shrinkage is given in BS : testing will be sufficient. NOTE 3. Deterioration of building blocks and some other 13 drying shrinkage. This is apparently shrinkage is consistently less than 0. Further information is given in 'Advice on data from the test results are to be no more certain unsound rock aggregates in concrete in Cornwall and than 5 years old provided the essential Devon', Department of the Environment, London, February character of the material does not change.
Appendix C. Guidance on the chloride content of aggregates Marine aggregates and some inland aggregates can contain chlorides.
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.
The use of combined aggregates within the limits in table 7 will in most circumstances result in concrete complying with BS : Part 1 and BS : Part 1, 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.
Limits for chloride content of aggregates I Type and use of concrete Chloride ion content expressed as percentage by mass of chloride ion of combined aggregate Prestressed concrete and heat-cured concrete containing embedded metal Concrete containing embedded metal made with I o-o1 cement complying with BS Concrete containing embedded metal and made 0.
All glory comes from daring to begin. The poorest of all people is not the person without a cent, but the person without a dream. Happiness is when what you think, what you say, and what you do are in harmony. Wear a smile and have friends; wear a scowl and have wrinkles.
Strive not to be a success, but rather to be of value. Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning. Life is a tragedy when seen in close-up, but a comedy in long-shot.
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