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This test covers determination of the density of freshly mixed concrete and gives formulas for calculating the yield, cement content, and air content of the concrete. Yield is defined as the volume of concrete produced from a mixture of known quantities of the component materials. Bulk density is determined by filling a container of known volume and mass of concrete required to fill the container divided by the volume.
U Box test is used to measure the filing ability of self compacting concrete. The apparatus consists of a vessel that is divided by a middle wall into two compartments; an opening with a sliding gate is fitted between the two sections.
J Ring Apparatus test the passing ability of the concrete .The equipment consists of rectangular section of 38 mm X 25 mm open steel ring drilled vertically with holes to accept threaded section of reinforcing bars 12 mm diameter 100 mm in length.The bars and sections can beplaced at different distance apart to simulate the congestion of reinforcement of the ring formed by vertical section is 300 mm and height 100 mm .
Vicat Apparatus With Dashpot is used to determine the amount of water required to produce a cement paste of standard consistency and the setting time. The time it takes for a cement to stiffen to a standard value after addition of water is commonly known as the set time. The test involves mixing cement with water and then measuring its resistance to penetration of a standard probe at varying intervals of time, until a certain value is reached.
The equipment for V funnel test on self compacting concrete consists of a v shaped funnel as, shown in Fig. An alternative type of V-funnel, the O funnel, with circular. The test was developed in Japan and used by Ozawa et al.
V-Tech is a renowned organization that manufactures and supplies the concrete flow table test set, which is used for high capacity concrete mix and to maintain a flow index by the means of arithmetic. It supplies this product in the reputed construction projects under governmental and non-governmental organizations.
Aggregate impact equipment with counter is used to determine the aggregate impact value of subject material which evaluates the relative resistance capacity on an aggregate at rapid level of shock or collision. The aggregate impact device is fitted with measuring cylinder, blow counter and filling rod. The device is used in classifying and measuring the strength of different kind of aggregates like asphalt, cement, rock, building materials and soil.
IS: 269, 712, 5514, 1727, 2645, 4031, and 6932(PART-IX) BS: 890, 915, 1370,4027,4226,4248 It is used for the determination of soundness by expansion method of ordinary and rapid hardening Portland cement, low heat Portland cement and Limes. It consists of a small split cylinder forming a mould. On either side of the split cylinder. Two parallel indicating arms with pointed ends are attached. Supplied complete with two glass plates and a lead weight.
Planetary Mixing Apparatus It is used for preparation of plastic mortar of cement and pozzolanic materials for making different types of test specimens in the laboratories.
The apparatus comprises the following :-
A motor-driven mixer which simultaneously imparts two motions to the mixing paddle i.e. revolving and planetary, they being opposite to one another in direction as per IS standards. A two speed gear box is incorporated in the drive which makes the paddle revolve at approximately 140 and 285 r.p.m. with corresponding planetary motion of 62 and 125 r.p.m. respectively.
A stainless steel mixing paddle of the specified shape and dimensions which can be attached or removed easily.
A stainless steel mixing bowl of about 6 litre capacity. This can be held with the mixing apparatus and its height is adjustable.
A scraper made from semi rigid rubber blade attached to a handle about 150 mm long. The blade is about 75 mm long and 50 mm wide. Suitable for operation on 220v, 50 Hz, single phase supply.
