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In general, concrete mixes are designed in order to achieve a defined workability, strength and durability . Download Concrete Mix Design, Quality Control and Specification By Ken W. Day – The assumption during writing the book was that I was fully retired and might contribute further to the future of concrete technology only via this book and my website, if at all. Some of the laboratory methods used for concrete quality control include; slump test, compressive strength test and workability tests. ACI Mix Design Concrete Mix Design - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. In the slump test the plastic concrete specimen is formed into a conical metal mold as described in ASTM Standard C-143. Concrete mix design is the process of detrmining right proportions of cement, sand and aggregates for concrete to achieve target strength of concrete. To produce good quality, durable concrete containing a portion of recycled concrete aggregate often requires trial concrete mixes and close monitoring of the properties of the old recycled concrete, with mix adjustments made, as needed. One major effect is on the packing density of aggregate which determine the amount of cement paste needed to fill the voids between the aggregate particles. The mold is lifted, leaving the concrete to "slump," that is, to spread or drop in height. Actual site conditions vary and thus this should be adjusted as per the location and other factors. A slump test is a method used to determine the consistency of concrete. Concrete Technology and Design of Concrete Structures Questions :- 1. Concrete mix design is defined as the appropriate selection and proportioning of constituents to produce a concrete with pre-defined characteristics in the fresh and hardened states. a) Grade designation : M25 b) Type of cement : OPC 53 Grade conforming IS 12269 c) Maximum nominal size of aggregate : 20mm d) Minimum cement content : 300 kg/m 3 (IS 456:2000) e) Maximum water-cement ratio : 0.50 (Table 5 of IS 456:2000) f) Workability : 100-120mm slump g) … The right concrete mix ratio can solve problems and the wrong mix can create them. Suspended slabs, beams, and girders (as often found in bridges) require 3,500 to 5,000 psi. COMPONENTS OF MIX DESIGN. The consistency, or stiffness, indicates how much water has been used in the mix. The stiffness of the concrete mix should be matched to the requirements for the finished product quality. There is a nominal strength that is reduced by a factor which must exceed the factored design stress. 35 videos Play all CE 413: Reinforced Concrete Design (Spring 2018) Gregory Michaelson FE Exam Review: Structural Design (2016.09.28) - …

Slump is a measurement of concrete's workability, or fluidity. The actual loads or working loads acting on the structure are estimated and members are proportioned on the basis of certain allowable stresses in concrete and steel. Traditional concrete walls and columns tend to range from 3,000 to 5,000 psi, … Concrete footings and slabs on grade typically require a concrete of 3,500 to 4,000 psi. The Advantages of concrete mix design is that it gives the right proportions of materials, thus making the concrete use economical in achieving required strength of structural members. To determine the modulus of rupture, the size of test specimen used is a) 150 x150 x500 300+ TOP Concrete Technology & Design of Concrete Structures MCQs Pdf Collection includes, Concrete technology books, Concrete Mix Design books, Concrete Admixtures Handbooks, Concrete Repair Manuals, Concrete Recycling Guides. Methods have been