BS 4550-3 4-1978 Methods of testing cement - Physical tests - Strength tests《水泥的试验方法 物理试验 强度试验》.pdf
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1、BRITISH STANDARD BS 4550-3.4: 1978 (Reprinted, incorporating Amendments No. 1, No. 2 and No. 3) Methods of testing cement Part 3: Physical tests Section 3.4 Strength tests IMPORTANT NOTEIt is recommended that this Section be read in conjunction with the information in the “General Introduction” to B
2、S4550 and with the information in BS4550-3.1, which are both issued separately. UDC 666.94.01:620.1:539.4BS4550-3.4:1978 This British Standard, having been prepared under the directionof the Cement, Gypsum,Aggregates and QuarryProducts Standards Committee, was published underthe authority of the Exe
3、cutive Board on 30 June 1978 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference CAB/1 Draft for comment 73/10751 DC ISBN 0 580 10139 8 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to10, an inside
4、back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue Comments 4247 May 1983 4498 March 1984 5704 J
5、uly 1988 Indicated by a sideline in the marginBS4550-3.4:1978 BSI 02-1999 i Contents Page 1 Compressive strength of concrete cubes 1 1.1 Test principle 1 1.2 References 1 1.3 Apparatus 1 1.4 Temperature and humidity conditions 2 1.5 Preparation of specimens 2 1.6 Storage of specimens 2 1.7 Testing o
6、f specimens 3 1.8 Calculation 3 1.9 Report 3 2 Compressive strength of mortar cubes 3 2.1 Test principle 3 2.2 References 3 2.3 Apparatus 3 2.4 Temperature and humidity conditions 5 2.5 Preparation of specimens 5 2.6 Storage of specimens 5 2.7 Testing of specimens 6 2.8 Calculation 6 2.9 Report 6 Fi
7、gure 1 Typical rotating pan concrete mixer 7 Figure 2 Suitable trowel 8 Figure 3 Typical vibration machine for compacting mortar cubes 9 Table 1 Temperature and humidity conditions 2 Table 2 Mixes for concrete cubes 3 Table 3 Masses of individual fractions of sand 3 Table 4 Temperature and humidity
8、conditions 5 Table 5 Mixes for mortar cubes 5 Publications referred to Inside back coverii blankBS4550-3.4:1978 BSI 02-1999 1 1 Compressive strength of concrete cubes 1.1 Test principle. The strength of cement is determined by compressive strength tests on100mm concrete cubes, made with specified co
9、arse and fine aggregates, mixed by machine and compacted manually with a compacting bar. 1.3 Apparatus. The following apparatus is required. 1.3.1 Moulds. The moulds shall be of 100mm cube size complying with 3.1 of BS1881-108:1983. 1.3.1.1 Size. The moulds shall be 100mm cubes. 1.3.1.2 Construction
10、. The mould shall be of ferrous metal (preferably cast iron or cast steel) and rigid enough to prevent distortion. The surface hardness of each internal face shall be at least 95 Rockwell (Scale B) hardness value. It shall be constructed in such a manner that it facilitates the removal of the moulde
11、d specimen without damage. The parts of the mould, when assembled, shall be positively and rigidly held together by suitable means, both during the filling and on subsequent handling of the filled mould. Each mould shall be provided with a steel base plate which shall be rigidly attached to the moul
12、d and shall support it without leakage or distortion. 1.3.1.3 Tolerances. The mould shall be such that, when assembled ready for use, the dimensions and internal faces are accurate within the following limits. a) Dimensions. The depth of the mould and the distance between either pair of opposite int
13、ernal faces, each based on the average of four symmetrically placed measurements, shall be100.00 0.15mm. b) Flatness. The surface of each internal face shall lie between two parallel planes 0.03mm apart. The joints between the sections of the mould and between the bottom surface of the mould and the
14、 top surface of the base plate shall lie between two parallel planes 0.06mm apart. c) Squareness. The surface of each internal face shall lie between two parallel planes 0.5mm apart which are perpendicular to the bottom surface of the mould and also to the adjacent internal faces. d) Parallelism. Th
15、e top surface of the mould shall lie between two parallel planes 1.0mm apart, parallel to the bottom surface. e) Surface texture. The surface texture of each internal face shall be3.2 4m CLA. 1.3.1.4 Assembly. In assembling the cleaned mould ready for use, the joints between the sections of the moul
16、d and between the bottom of the mould and the base plate shall be sealed by a thin film of grease or other suitable method to prevent escape of water. Any excess grease shall be carefully removed. The internal faces of the assembled mould shall be thinly coated with mould oil to prevent adhesion of
17、the concrete. 1.3.2 Mixer. The concrete mixer 1)shall be of suitable capacity to mix a complete batch in one operation. It shall comprise a rotating mixing pan with a contra-rotating mixing paddle and a scraper blade. The sizes and tolerances shall be as shown inFigure 1. The mixing pan (preferably
18、removable) shall rotate at 18 1 r/min. The mixing paddle (offset from the pan centre) shall rotate at 905r/min. The mixing paddle and scraper blade shall be positively spring loaded to ensure they do not jam during mixing. Simple and positive means of vertical adjustment shall be provided on the mou
19、ntings of the mixing paddle and scraper blade. The clearances F 1 , F 2and G shall be checked every month or after every 100 mixing operations whichever represents the more frequent use. The mixer shall preferably be fitted with an automatic timing device otherwise a stop clock shall be provided. 1.
20、3.3 Trowel. The trowel shall have a cast steel blade; a suitable type is shown in Figure 2. 1.3.4 Compacting bar. The compacting bar shall be a steel bar weighing 1.8 0.1 kg and having a ramming face 25.0 0.5mm square. 1.3.5 Tank. The tank shall contain clean tap water, which shall be renewed at lea
21、st every seven days with water at the specified temperature. Specimens made with high alumina, supersulphated or Portland-type cements shall not be placed in the same tank. 1) For information on the availability of suitable mixers apply to Enquiry Section, BSI, Linford Wood, Milton Keynes MK 14 6LE,
22、 enclosing a stamped addressed envelope for reply.BS4550-3.4:1978 2 BSI 02-1999 1.3.6 Compression testing machine. The compression testing machine shall be of suitable capacity 2)for the test and shall comply with BS1881-115. Over the scale range(s) used, the machine shall be capable of applying loa
23、d at the rate given in1.7 and shall comply with grade 1.0 of BS1610-1:1985 as regards repeatability and accuracy. The lower limit of verification for the scale range used shall be below the expected maximum load on any specimen tested on that scale range. 1.4 Temperature and humidity conditions. The
24、 temperature throughout the entire test procedure shall be controlled about a midpoint of 20C with permitted variations as shown in Table 1. The minimum relative humidity shall be as given in Table 1. Table 1 Temperature and humidity conditions Before use, all materials, moulds and other appliances
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