### Concrete mix problem - Eng-Tips Engineering Forums

09-07-2012 Dear fellow engineers I have been having problems in my concrete for the couple of weeks in every grade of concrete. Generally we keep the FA:CA=50%:50% which i Concrete mix problem - Concrete Engineering general discussion - Eng-Tips

Get price### Concrete Mix design review - Eng-Tips Engineering Forums

16-12-2007 Name of concrete supplier and source of materials should be shown as a change in these variables can affect the quality of the mix. 4. The 1 cu.yd mix based on an SSD (saturated surface dry) basis must show weights of cement, aggregates, and water, including additive/admixture dosage rate

Get price### Concrete Mix Design - Eng-Tips Engineering Forums

09-04-2016 Concrete Mix Design. Concrete Mix Design. drago8 (Civil/Environmental) (OP) 9 Apr 16 01:14. Dear All, I have an enquiry regarding concrete mix design. Usually how do you guys review the submitted concrete mix design by the Contractor?

Get price### Concrete cube testing problems - Eng-Tips Engineering Forums

15-10-2003 Lab curing only tests the potential of the concrete to achieve the design strength. What you are really interested in is if the concrete in the field has the necessary strength. If there is any problem with the samples, then move on to some sort of field-testing. You could take cores of the material or use a Schmidt Hammer.

Get price### How to Solve Common Concrete Problems in Construction

20-11-2019 Ivan / Getty Images. Another common concrete problem is scaling. Scaling occurs when the concrete surface breaks off and keeps peeling away. Scaling could also occur if non-air entrained concrete is exposed to freeze-thaw cycles, inadequate concrete strength, or inadequate curing procedure.. How can concrete scaling be avoided:

Get price### 10 Most Common Concrete Problems - Concrete Information

05-08-2021 The related problem can damage your concrete actions, in this instance, it’s also more critical. You can not allow your customers to walk up down bent, fallen steps. That is a prescription for failure in the frame of a trip-and-fall happening, and you could be held responsible for the damages.

Get price### concrete mix - ACI (concrete) Code Issues - Eng-Tips

06-04-2010 Is there main difference of concrete mix between column and wall? or there exists no difference between two in mix. concrete mix - ACI (concrete) Code Issues - Eng-Tips Engineering

Get price### concrete mix - Structural engineering general discussion ...

03-11-2007 RE: concrete mix msquared48 (Structural) 23 Oct 07 15:33 Respectively, the figures refer to the amounts of cement, sand and stone or aggregate, in that order, by unit of measure (Cu Yd).

Get price### Slag Cement in Slab Concrete Mix - Eng-Tips Engineering Forums

04-03-2012 RE: Slag Cement in Slab Concrete Mix jdgengineer (Structural) 2 Mar 12 09:43 The document also mentioned that up to 70% slag has been used as a substitution, but they recommend using a 50% substitution as a maximum threshold.

Get price### ACI mix design - Civil Engineering

ACI Mix Design 6. Calculation of cement content-- Once the water content and the w/c ratio is determined, the amount of cement per unit volume of the concrete is found by dividing the estimated water content by the w/c ratio. weight of water weight of cement wc Mix Design Procedures However, a minimum cement content is required to

Get price### How to Solve Common Concrete Problems in Construction

20-11-2019 Ivan / Getty Images. Another common concrete problem is scaling. Scaling occurs when the concrete surface breaks off and keeps peeling away. Scaling could also occur if non-air entrained concrete is exposed to freeze-thaw cycles, inadequate concrete strength, or inadequate curing procedure.. How can concrete scaling be avoided:

Get price### Mix Design Of Concrete Concrete Mix Design M 25 Mix ...

Concrete Trial Mix 2. To increase the workability of concrete mix from 25 mm to 50-75 mm an increase in water content by +3% is to be made. The corrected water content for mix = 191.6 x 1.03 = 197.4 kg. As mentioned earlier to adjust fresh concrete properties the water cement ratio should not be changed. Hence; Cement Content = (197.4/0.5 ...

Get price### Batching, Mixing, Transporting, and Handling Concrete ...

30 minutes is not usually a problem; concrete that is kept agitated generally can be placed and compacted within 1. 1 ⁄ 2. hours after mixing unless hot concrete temperatures or. Mobile Batcher Mixed Concrete (Continuous Mixer) Mobile volumetric mixers are special trucks (Fig. 10-7) that batch by volume and continuously mix concrete as

Get price### How to Properly Mix Concrete (DIY) Family Handyman

Whether you hand mix concrete in a plastic tub, homemade mixing tub or wheelbarrow, the technique is the same to find the right concrete mix ratio. However, it's easier to move and dump concrete that's mixed in a wheelbarrow. For larger jobs, you could rent a mixer ($35 per day), but it may be more economical to simply order ready-mix concrete.

Get price### Guidelines for Concrete Mix Designs - cdn.ymaws

concrete mixes. It is also helpful to have handy copies of the standards referenced in the project specifications and in ACI 318. If mix designs are submitted for work specified by multiple design professionals (e.g., civil work) each design professional specifying concrete mixes should make it clear which mix designs they have reviewed.

Get price### Concrete Mix Design Procedure and Example IS456

Procedure for Concrete Mix Design as per IS 456 : 2000. 1. Determine the mean target strength ft from the specified characteristic compressive strength at 28-day fck and the level of quality control. f t = f ck + 1.65 S where S is the standard deviation obtained from the Table of approximate contents given after the design mix

Get price### ACI mix design - Civil Engineering

ACI Mix Design 6. Calculation of cement content-- Once the water content and the w/c ratio is determined, the amount of cement per unit volume of the concrete is found by dividing the estimated water content by the w/c ratio. weight of water weight of cement wc Mix Design Procedures However, a minimum cement content is required to

Get price### Batching, Mixing, Transporting, and Handling Concrete ...

30 minutes is not usually a problem; concrete that is kept agitated generally can be placed and compacted within 1. 1 ⁄ 2. hours after mixing unless hot concrete temperatures or. Mobile Batcher Mixed Concrete (Continuous Mixer) Mobile volumetric mixers are special trucks (Fig. 10-7) that batch by volume and continuously mix concrete as

Get price### CONCRETE BASICS A Guide to Concrete Practice

mixed together. A measured amount of cement is added and mixed in. Enough water is added to make the mix workable. All the materials are then mixed together well.The cement powder and water form a paste which bonds the aggregates together like glue. Cement Concrete Aggregates Australia 5 CONTENTS Concrete Basics Concrete Materials 5

Get price### Concrete Mix Design Calculations

Basic Concrete Mix Design Materials Pounds of material S.G. Abs Volume 667 3.15 X 62.4 Cement 667 3.15 3.39-Total Cementious 667 Miller Stone 1590 2.6 9.80 Evert Sand 1242 2.65 7.51 Water 300 1 481 1590 2.60 X 62.4 1242 2.65 X 62.4 4.81 Air 5.5% 1.485 Total 3799 27.00 w / cm 0.45 Unit Wt. 140.72 Basic Concrete Mix Design Materials Pounds of ...

Get price### Concrete Mix Design Procedure and Example IS456

Procedure for Concrete Mix Design as per IS 456 : 2000. 1. Determine the mean target strength ft from the specified characteristic compressive strength at 28-day fck and the level of quality control. f t = f ck + 1.65 S where S is the standard deviation obtained from the Table of approximate contents given after the design mix

Get price### Concrete Mix Design Calculation - M20, M25, M30 ...

So, concrete mix design can be stated as Concrete Mix = Cement:Sand:Aggregates. The concrete mix design involves various steps, calculations and laboratory testing to find right mix proportions. This process is usually adopted for structures which requires higher grades of concrete such as M25 and above and large construction projects where quantity of concrete consumption is huge..

Get price### ACI Method Concrete Mix Design Mix Ratio - Civil Engineering

18-03-2017 Mix design can be defined as the process of selecting suitable ingredients of concrete and determining their relative proportions with the object of producing concrete of certain minimum strength and durability as economically as possible. One of the ultimate aims of studying the various properties of the materials of concrete, plastic concrete and hardened concrete is to

Get price### STRUCTURE magazine Mass Concreting

Beginning concrete placement with a lower initial concrete temperature is recommended to keep the concrete from reaching upper-temperature limits. Typical methods to keep concrete temperatures low include the introduction of crushed ice to the mix in lieu of some of the mixing water and the use of precooled aggregate.

Get price### Civil Read - Concreting Civil Engineers

All Civil Engineering Articles, Free e books, Current Openings, Jobs, Study Materials, ... Setting time of cement: When cement is mixed with water, ... Causes of cracks in concrete. Self Healing Concrete Bio-concrete:- We know that cracks are a major problem in concrete.

Get price### Concrete Mix Design Different Grades of Concrete

17-05-2017 Concrete Mix design of M5, M7.5, M10, M15, M20, M25, M30 and higher grades of concrete is calculated as below: The procedure for finding the different grades of concrete mixes are same. The below mentioned method can be applied to any grade of concrete by changing the values. To make ease in understanding we are finding the Concrete mix design ...

Get price