In certain situations increase in cementitious material content may be warranted. The decision on increase in cementitous material content and its percentage may be based on experience and trial. Exposure conditions and limiting values. The absolute volume of total aggregate coarse and fine is calculated by following relation,.
For example, 2 percent of cement. According to IS , the volume of air content has been neglected. Estimation of coarse aggregate and fine aggregate proportions in total aggregate volume. The coarse aggregate used shall be confirmed to IS Coarse aggregates of different sizes may be combined in suitable proportions so as to result in an overall grading confirming to Table 2 of IS for particular nominal maximum size of aggregate.
Based on nominal maximum size of aggregate and grading zone of fine aggregate, the volume of coarse aggregate per unit volume of total aggregate is determined from Table no. If the selected water-cement ratio is differing from 0. For every increase in water-cement ratio by 0. Similarly, for every decrease in water-cement ratio by 0. For example, if the selected water-cement ratio is 0. Volume of coarse aggregate per unit volume of total agggregate. When the method of placing of concrete is by pumping or when the concrete is required to be worked around congested reinforcing steel, it is desirable to reduce the volume of coarse aggregate up to 10 percent.
As the coarse aggregate proportion is already determined, the remaining proportion will be the fine aggregate proportion. For example, if the coarse aggregate proportion is 0. The zone of the given fine aggregate shall be confirmed to Table 4 of IS Estimation of coarse aggregate and fine aggregate contents. The coarse and fine aggregate contents are determined by multiplying respective volumes with their respective specific gravities and multiplying by The total volume of aggregate, V a.
The coarse aggregate volume in total aggregate, V ca. The fine aggregate volume in total aggregate, V fa. The calculated mix proportions Trial Mix No. The workability of the Trial Mix No. The mix shall be carefully observed for freedom from segregation and bleeding and its finishing properties.
If the measured workability of Trial Mix No. With this adjustment, the mix proportion shall be recalculated by keeping the free water-cement ratio at the pre-selected value, which will comprise Trial Mix No.
In addition two more Trial Mixes No. Mix No. Clause 9. If the measured. In addition,. An illustrative example of concrete mix proportioning for mass concreting is given in Annex F. This example. The actual mix proportioning shall be based on various trials with the. Clause 5. A-0 An example illustrating the mix proportioning for a concrete of M40 grade is given in A-1 to A Based on trial data, the water content reduction of 23 percent is considered while using superplasticizer at the rate 1.
Hence the water content. As superplasticizer is used, the water content may be. Specific gravity of water. Coarse aggregate. IS Sieve Sizes. Analysis of Coarse Aggregate. Percentage of Different Fractions. So, water-cementitious ratio. NOTE — Aggregates shall be used in saturated surface dry condition. If otherwise, when computing the requirement of mixing water, allowance shall be made for the free surface moisture contributed by the fine and coarse aggregates.
On the other hand, if the aggregates are dry, the amount of mixing water shall be increased by an amount equal to the moisture likely to be absorbed by the aggregates. Necessary adjustments are also required to be made in mass of aggregates. The surface water and percent water absorption of aggregates shall be determined according to IS Part 3.
Mass of wet fine aggregate. Water content contributed by wet fine aggregate. The requirement for added water becomes :. Water to be added aggregate Wet Coarse aggregate Wet. Chemical admixture. Free water-cementitious materials ratio. B The total mass of coarse aggregate shall be divided into two fractions of 20 — 10 mm and 10 — 4. In this example, the ratio works out to be as shown under B-2 k. The coarse and fine aggregates, being wet, contribute.
SSD condition. The quantity of. B The slump shall be measured and the water content. The mix proportions shall be reworked for the actual water content and checked for durability requirements.
However, durability requirement shall be met. Conforming to Table 7 of IS Fine aggregate. Hence the arrived water content. Cement content.
Therefore, target strength using both equations, that is,. From Table 5 of IS , minimum cement content for.
To proportion a mix containing GGBS the following. Decide the percentage of GGBS to be used. In certain situations increase in cementitious material content may be warranted. The decision on increase in cementitious material content and its percentage may be based on experience and trials.
GGBS 40 percent of total cementitious material content. The higher value is to be adopted. Therefore, target. Cement OPC. From Table 3, the approximate amount of f. From Fig. This is lower than the maximum value of. From Table 4, water content. Estimated water content for mm slump increasing. As super plasticizer is used, the water content may be reduced. Based on trial data, the water content reduction of 23 percent is considered while using super plasticizer at the rate of 1.
From Table 5, volume of coarse aggregate corresponding to 20 mm size aggregate and fine aggregate Zone II for water-cement ratio of 0. In the present case water-cementitious ratio is 0. Therefore, volume of coarse aggregate is required to be increased to decrease the fine aggregate content.
Therefore, corrected volume of coarse aggregate for the water-cementitious ratio of 0. For pumpable concrete these values may be reduced by up to 10 percent. Here, 10 percent reduction is considered.
Therefore, volume of coarse aggregate. Volume of fine aggregate content. The mix calculation per unit volume of concrete shall be as follows:. Total Volume. Volume of total aggregate. Mass of coarse aggregate. Water—cement ratio. Water content. It is proposed to add 15 percent fly ash in the mix, in such situations increase in cementitious material content.
NOTE — This illustrative example is with an increase of The cementitious material content. Silica fume content 5 percent by weight of revised. Therefore, target strength. From Table 6, the approximate amount of.
Check for minimum cementitious materials content,. Hence OK. From Table 10, volume of coarse aggregate. This is valid for water-cementitious materials ratio of 0. As water-cementitious material ratio is actually 0. From Table 8, the water-cementitious materials ratio. This is lower than the maximum value of 0. From Table. Estimated water content for mm slump. As superplasticizer Polycarboxylate ether based is used, the water content can be reduced by 30 percent.
Hence, the reduced water content. Total volume. Mass of cement. Clause 8. OPC 43 grade conforming to IS Severe for reinforced concrete. Slump flow class Passing ability by L box test. SF3 slump flow mm — mm. Rat tio o. Class V1 flow time. V- Funnel flow time Viscosity Sieve segregation resistance. SR1 15percent. Crushed angular aggregate. Conforming of Table 7 of IS Learn more about Scribd Membership Home. Read free for days Sign In.
Much more than documents. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Date uploaded Feb 13, Did you find this document useful? Is this content inappropriate? Report this Document. Flag for Inappropriate Content. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document.
The s. Grade of Concrete. Value of X. M65 and above. Table 2 Assumed Standard Deviation. Clause 4. Assumed Standard. The cementitious materials content so calculated shall.
IS or as specified. Estimation of Coarse Aggregate Proportion. Aggregates of essentially the same nominal.
Approximate A values for this aggregate volume. Nominal Maximum Size of. Water Content 1. These quantities of mixing water are e. On account of long distances over which concrete needs to be. The initial slump value shall. Calculation of. The coarse. If the. PCE type Poly. Concrete Mix Proportioning. Target Strength for Mix Proportioning. See 4. Selection of Maximum Size of Aggregate.
To achieve high strength concrete. Cementitious Materials. Proper selection of type of. GGBS or metakaoline are widely used as cementitious. Coarse Aggregate. In the proportioning of high strength concrete, the. Therefore, the coarse aggregate shall be. Generally crushed stone.
The recommended. The optimum content of the coarse aggregate depends. For proportioning of ordinary and standard. Prabhakaran for sharing this information with us on engineeringcivil. We hope this would be of great significance to civil engineers seeking information on M30 design mix in Bangalore region. Jayshree meshram September 23, at am. In which IS code specification for specific gravity of cement is given.
Reply Link. Cancel reply. Civil Engineering Forum. Top Contributors You can list yourself here by submitting civil engineering related topics to us.IS : Maximum cement content. Whether a chemical admixture shall or shall not be used and the type of chemical admixture and the extent of use. Whether a mozilla firefox software free download windows 7 admixture shall or shall not be used and the type of mineral admixture and the extent of use; and. Any other specific requirement like early age strength requirements. NOTE — Suitable reduction in water cement or water cementitious material ratio shall be done after concrfte mix has been finalized based on trial mixes, to achieve the specific requirement of high early strength, if any. The reduced ratio shall be fixed concrete mix design code is 10262 free download on trials for the required early strength. These trials shall be carried out after recalculating all the mix proportions. In order frfe not more than the specified proportion of. Table e. The standard deviation dlwnload each grade of concrete shall. Standard deviation concrete mix design code is 10262 free download on test strength of. The standard deviation shall be. If higher, necessary. Calculation of standard deviation. Calculate the standard deviation, Sof the strength test. For a single group of consecutive test results:. Where sufficient test results for a particular grade of concrete are not available, the value of standard deviation given in Table 2 may be assumed for the proportioning of mix in the first instance. Concrete mix design code is 10262 free download soon as the results of samples are concrete mix design code is 10262 free download, actual calculated standard deviation shall be used and the mix may be proportioned suitably. However, when adequate past records for a similar grade exist and it is justified to adopt a value of. Table 1 Value of X Clause 4. Different cements, supplementary cementitious. Silica fume conforming to a standard approved by the deciding mix design and this concrete is to be actually free water-cement ratio should preferably be. Procedure for concrete mix design calculation as per IS based on Ad Free! EXPLORE VIP Membership. Generally, cement is more costly than other strength of concrete at 28 days (fck) and value of standard deviation (s). Significant changes have been made in the new code adapting from international codes on concrete mix design. The new code can now be used for designing a. IS This standard provides guidelines for proportioning concrete mixes as per the requirements using illustrative example of concrete mix design, etc. relationship between strength and free water-cement. Indian standard method: IS ▻ The Bureau of Indian Standards, recommended a set of procedure for design of concrete mix mainly based on the. Concrete Mix Design- IS Concrete is an intimate mixture of: Cement,. Sand (Fine Aggregate), Free from organic/ mineral s = standard deviation. considered in mix design. If higher, necessary. modification shall be done in the mix. Calculation of standard deviation. Calculate the. Mix proportioning for a concrete of M30 grade is given in A·I to A-ll. From Table I of IS , Standard Deviation, s = 5 N/mm2. the requirement of mixing water, allowance shall be made for the free (surface) moisture contributed by. Detailed procedure of concrete mix design as per IS III. Home · Courses · Articles · Downloads · Solution Manuals · Log in · Register Concrete Mix Proportioning according to Indian Standard Guidelines. 5. may produce concretes of different compressive strength for the same free water-cement ratio. Audio Software icon An illustration of a 3. Please reattach it. IS The new code explains the mix proportioning procedure using a typical mix design problem. Build projects. Download the source code; If you feel comfortable building applications from source, then this is the recommend way to download Code::Blocks. Earn certifications. Wankhede d. Forums New posts Search forums. For preliminary calculation, water cement ratio as given is ISTable 5 also given below for different environmental exposure condition, may be used. IRC the latest one. What's new. Government Documents. Repeating Trial Mixes If the measured workability of trial mix no.