Specifies materials, tolerances and minimum performance levels for precast concrete masonry units (blocks and bricks). Appendices give methods of measuring dimensions and determining strength and drying shrinkage.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | BRITISH STANDARD <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | Committees responsible for this British\ufffdStandard <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Contents <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 2 References 3 Definitions 3.1 masonry unit 3.1.1 block 3.1.2 brick 3.1.3 fixing unit 3.2 Types of block solid block cellular block hollow block <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 3.3 Types of brick 3.3.1 solid brick 3.3.2 perforated brick 3.3.3 hollow brick 3.3.4 cellular brick 3.4 Sizes 3.4.1 co-ordinating size 3.4.2 work size 3.5 compressive strength 4 Binders and binder constituents 5 Aggregates 6 Admixtures 7 Chloride content 8 External shell thickness of blocks <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 9 Dimensional deviations 10 Strength 10.1 When sampled in accordance with Clause\ufffd 10.2 When sampled in accordance with Clause\ufffd 11 Drying shrinkage 12 Certificate of compliance <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 13 Independent testing 13.1 Sampling 13.2 Identification and protection of samples Table 1 Number of masonry units required for testing 14 Identification of masonry units <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Appendix A Measurement of dimensions A.1 Measurement of blocks A.1.1 Test specimens A.1.2 Apparatus A.1.3 Height and length A.1.4 Thickness A.1.5 Minimum external shell thickness A.2 Measurement of bricks <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Figure 1 GO\/NOT GO gauges for checking length and height of blocks <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figure 2 Checking and measuring dimensions of blocks <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Appendix B Determination of compressive strength B.1 Compressive strength of blocks B.1.1 Apparatus <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | B.1.2 Preparation of specimens B.1.3 Test procedure <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | B.1.4 Calculation of compressive strength B. 2 Compressive strength of bricks and fixing units B.2.1 Apparatus B. 2.2 Preparation of specimens B.2.3 Testing procedure B.2.4 Calculation of compressive strength <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | B.2.5 Calculation of standard deviation Appendix C Determination of transverse strength C.1 Apparatus C.2 Preparation of specimens C.3 Test procedure C.3.1 Place each block centrally on the support bearers with the bedding faces perpendicular to the pla… C.3.2 Maintain the appropriate loading rate, as far as possible, right up to failure C.3.3 Record the maximum load in newtons carried by the specimen during the test, to the nearest 25\ufffdN. C.4 Calculation of transverse strength C.4.1 Calculate to the nearest millimetre the average value of the thickness of the specimen in accorda… C.4.2 Calculate to the nearest millimetre the mean height of the specimen, using the results obtained f… <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | C.4.3 Obtain the transverse strength of the specimen from the following expression: C.4.4 Calculate the average transverse strength of the sample, to the nearest 0.05 N\/mm Figure 3 Apparatus for transverse strength test <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Appendix D Determination of drying shrinkage D.1 Apparatus D.1.1 Measuring apparatus, D.1.2 Ovens <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 4 Typical measuring apparatus for drying shrinkage <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | D.1.3 Cooling cabinet D.2 Preparation of specimens D.2.1 Take four masonry units at random. D.2.2 Where blocks are being tested, saw one specimen from each of the blocks, with a length of not les… D.2.3 Where practicable drill or cut into the centre of each end of each specimen a depression not more… <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | D.2.4 Completely immerse the specimens in water at room temperature for a minimum of\ufffd4\ufffddays and a maxim… D.3 Method of test D.3.1 Wet measurement of specimens D.3.2 Drying, cooling and measuring of specimens <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | D.4 Calculation of results <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Precast concrete masonry units – Specification for precast concrete masonry units<\/b><\/p>\n |