AS 1012.8.4 pdf download – Methods of testing concrete Method 8.4: Method for making and curing concrete—Drying shrinkage specimens prepared in the field or in the laboratory
3.2 Self-compacting concrete (scc)
Concrete that is able to flow and consolidate under its own weight, and completely fill theformwork or bore hole even in the presence of dense reinforcement，whilst maintaininghomogeneity and without the need for additional compaction. sCC is also known as’self-consolidating concrete’ and ‘super-workable concrete’ .
The following apparatus shall be used.4.1Moulds
Moulds shall be made of non-absorbent material which does not react with cement pasteand their internal surfaces shall have a smooth finish.The moulds shall be substantialenough to hold their form without distortion and shall be substantially leak-proof.
Each mould shall be provided with a base plate to which two end plates are securelyfastened by screws, two side plates which are fastened to the end plates by screws, and twopartially loose end plates which act as gauge stud holders. Each gauge stud holder shall fitinside the end of the mould and shall locate and secure a gauge stud during the settingperiod of the concrete.Each gauge stud holder shall be held in position against the end plateby a retaining screw and shall be capable of release after compaction of the concrete. Theopposite side plates shall be parallel and the distance between them shall be 75±l mm. Theinside height shall be 75 +1 mm.
4.1.2 Construction of the mould
The construction of the mould shall be aligned coaxially along the central axis of themoulded specimen，with the distance between the inner ends of the two studs being250土0.5 mm, and that between the outer ends 295±1 mm.Gauge studs shall protrude fromthe gauge stud holders to a distance of l5±l mm. A suitable form of construction of themoulds is shown in Figure 1.
Gauge studs shall be of stainless steel and shall comply with the dimensions shown inFigure 2.The radius of the gauge stud end shall be as follows:
(a) Horizontal comparator ….approximately 150 mm.(b)Vertical comparator ..approximately 5 mm.Gauge studs for horizontal and vertical comparators shall not be interchanged.
NOTE:As gauge studs are not interchangeable, it is recommended that the preparing laboratoryconfirm that the proposed gauge studs are compatible with the measuring laboratory’s equipment.4.3 Length gauge
A length gauge shall be provided for checking the nominal length between gauge studs. Thelength gauge shall be made of metal and shall have a diameter of at least 6 mm and a lengthof 250 士0.2 mm. The ends of the bar shall be flat and perpendicular to its length.
4.4Tamping bar (hand compaction)
The bar used for compacting concrete in the moulds shall be a straight metal rectangular barhaving nominal dimensions of 25 mm x 10 mm x 300 mm long with a ramming face squarewith the axis.