Ml Gambhir Concrete Technology Book Pdf Free Download PORTABLE

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The concrete slump test measures the consistency of fresh concrete before it sets. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows. It can also be used as an indicator of an improperly mixed batch. The test is popular due to the simplicity of apparatus used and simple procedure. The slump test is used to ensure uniformity for different loads of concrete under field conditions.[1]

A separate test, known as the flow table, or slump-flow test, is used for concrete that is too fluid (non-workable) to be measured using the standard slump test, because the concrete will not retain its shape when the cone is removed.

The test is carried out using a metal mould in the shape of a conical frustum known as a slump cone or Abrams cone, that is open at both ends and has attached handles. The tool typically has an internal diameter of 100 millimetres (3.9 in) at the top and of 200 millimetres (7.9 in) at the bottom with a height of 305 millimetres (12.0 in).The cone is placed on a hard non-absorbent surface. This cone is filled with fresh concrete in three stages. Each time, each layer is tamped 25 times with a 2 ft (600 mm)-long bullet-nosed metal rod measuring .mw-parser-output .sfrac{white-space:nowrap}.mw-parser-output .sfrac.tion,.mw-parser-output .sfrac .tion{display:inline-block;vertical-align:-0.5em;font-size:85%;text-align:center}.mw-parser-output .sfrac .num,.mw-parser-output .sfrac .den{display:block;line-height:1em;margin:0 0.1em}.mw-parser-output .sfrac .den{border-top:1px solid}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}5/8 in (16 mm) in diameter.[2] At the end of the third stage, the concrete is struck off flush with the top of the mould. The mould is carefully lifted vertically upwards, so as not to disturb the concrete cone.

The slumped concrete takes various shapes and according to the profile of slumped concrete, the slump is termed as true slump, shear slump or collapse slump. If a shear or collapse slump is achieved, a fresh sample should be taken and the test repeated.

In the United States, engineers use the ASTM C94, standard specification for ready-mixed concrete, and AASHTO specifications, address clump tolerances in detail. For diverse forms of concrete construction, different slumps are required. For example: for walls, slumps typically range from 4-in to 8-in. The American standards explicitly state that the slump cone should have a height of 12-in (300 mm), a bottom diameter of 8-in (200 mm) and an upper diameter of 4-in (100 mm). The soft SI conversions provided in the standard allow using the same dimension slump cones as those described in other standards. The ASTM standards also regulate the rigidity of the cone. It states in the procedure that when the cone is removed, it should be lifted up vertically, without any rotational movement at all.[6] The concrete slump test is known as "Standard Test Method for Slump of Hydraulic-Cement Concrete" and carries the code (ASTM C 143) or (AASHTO T 119).

Another way of determining slump is to use an automated slump meter. Sensors and controls enable the meters to measure and display slump. Their reliability has by now earned them acceptance in various standard codes such as ASTM International. Some automated slump meters, such as the one by Verifi also can add water to the concrete mix in the delivery truck while in transit. In 2013 ASTM C94/C94M was revised to allow water additions during transit for trucks equipped with automated slump monitoring and measurement systems.

Although research on different RS replacements, such as manufactured sand (RS) [12], seashells [13], rich husk ash [14], etc., serving as fine aggregates of SCC has been carried out, these studies did not provide a comparison between different fine aggregates. In the past, the majority of research was focused on general SCC; nowadays, however, more and more attention has been paid to SCLC. Moreover, the effects of fine aggregate on the mechanical and durability properties of SCLC are still uncertain and yet to be determined. The inherent high porosity of the lightweight aggregates, the likelihood of the high permeability of lightweight concrete and whether or not SCLC has a good durability performance in the long term are still questionable.

There are different methods of making lightweight concretes [19]. In this study, the coarse aggregate used for SCLC was expanded shale lightweight aggregate (LWA). Figure 1 and Table 1 display the appearance and the properties of the LWA, respectively. The river sand (RS), manufactured sand (MS) of granite and lightweight sand (LS) of crushed expanded shale were used as fine aggregates in this study. RS served as the control fine aggregate. The appearances of these fine aggregates are displayed in Figure 2. From Figure 2, it can be shown that the particle shape of RS is nearly spherical. In contrast, the particle shape of MS and LS is angular. Table 2 lists the fineness modulus and grading of the different fine aggregates. In general, MS is coarser than LS and RS. LS is uniformly graded with a 2.36-mm maximum size. As indicated in Table 2, the fineness modulus of RS, MS and LS is 2.77, 3.45 and 2.96, respectively.

The slump flow test evaluates the flowability of SCC without any obstruction. The diameter of the slump flow (Figure 3) is the measurement required for all SCLC. EN 12350-8:2010 states that self-compacting concrete should have a slump flow value of between 550 mm and 850 mm, while T50 time are the time spent for the concrete to reach the 500 mm spread circle (see Figure 3). The T50 times less than two seconds result in a VS1 classification (viscosity classes expressed by T50), while T50 times greater than or equal to two seconds result in a VS2 classification.

L&T Construction on Tuesday said it was constructing India's first post office building using 3D printing technology in Bengaluru. The project is to design and build the 1,000 square feet Halasuru Post Office using 3D Concrete Printing Technology within 45 days, the company said. It added that the project scope involves structure, MEP (mechanical, electrical and plumbing), and finishes.

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