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were used to predict the compressive strength of GPC, where coarse and ﬁne waste steel slag were used as aggregates. The prepared mixtures contained ﬂy ash, sodium hydroxide in solid state, sodium silicate solution, coarse and ﬁne steel slag aggregates as well as water, in which four variables (ﬂy
As the percentage of coconut shell replacement with coarse aggregate increases the strength properties decreases. The compressive strength of concrete is increased by 20% with the addition of fibers to the concrete with coconut shells. With addition of steel fibers .
So, undoubtedly, greater the maximum size of coarse aggregate, greater is the compressive strength of concrete made with 2 precautionary conditions:- 1. The coarse aggregates should be properly graded, and the gradation becomes more and more important as we increase the maximum size of coarse aggregate because of greater voids, which needs to be filled to attain the desired compressive strength.
According to Wikipedia, Compressive Strength of concrete is defined as the Characteristic strength of 150mm size concrete cubes tested at 28 days. Concrete is a macro content with Sand, Cement, & Coarse aggregate as its micro-ingredient (Mix Ratio) and gains its strength over time at the hardened state. Take a look at the below table.
Factors to consider- aggregates Economical consideration Minimize water and cement, Stiffest possible mix Largest practical max size of aggregate, Shape, Surface Texture Optimize ratio of fine to coarse aggregate Grading (Particle Size distribution, PSD) and its significance, Consistency, Strength.
Coarse Aggregate. When the aggregate is sieved through 4.75mm sieve, the aggregate retained is called coarse aggregate. Gravel, cobble and boulders come under this category. The maximum size aggregate used may be dependent upon some conditions.
Compressive strength function the PSD of coarse aggregate was determined at 7, 14 and 28 days. Results have revealed that the mixtures without chemical admixture made with a ternary combination of granular fraction and having a maximum size of 25 mm, that assures a continuous granular size distribution, have shown the highest compressive strength.
size can achieve compressive strength up to 160 Mpa at 28 days . Mineral content in coarse aggregate also influence to the bond strength of the aggregate-concrete mix. Normal concrete compressive strength at 28 days for the granite aggregate is 30 MPa . Aggregate shape and texture can help to .
For each type of coarse aggregate 75 cubes (150x150mm) were cast to allow the compressive strength to be monitored at 3, 7, 14, 21, and 28 days. Test result show that concrete made from river gravel has the highest workability followed by crushed quartzite and crushed granite aggregates.
Strength of the concrete is mainly dependent on bonding of the fine aggregates which fills the voids between the coarse aggregates. It is found that the strength of concrete is more for w/c of 0.45 when compared with w/c of 0.5. As the quantity of water increases, the compressive strength decreases when replaced with quarry dust.
Designing Concrete Mixtures There are three phases in the development of a concrete mixture: specifying, designing, and proportioning ... compressive strength and a range of w/c ratios are ... different coarse aggregates and fineness moduli of fine aggregates Fineness Modulus Max Aggregate ...
Blending recycle coarse aggregate with natural aggregate up to 75% in concrete does not affect the compressive strength of the concrete. RECOMMENDATIONS So it was advisable to use 25 to 50% recycled coarse aggregate in low rise structure, pavement design, .
How to Calculate Quantities of Cement, Sand and Aggregate for Nominal Concrete Mix (1:2:4)? Mix design is a process of determining the right quality materials and their relative proportions to prepare concrete of desired properties like workability, strength, setting time and durability.
The compressive strength of both normal and high-strength concrete is little affected by aggregate size. High-strength concrete containing basalt and normal-strength concrete containing basalt or limestone yield higher compressive strengths with higher coarse aggregate contents than with lower coarse aggregate contents. The compressive strength of high-strength concrete containing limestone is not .
The compressive strength of concrete depends upon a number of factor such as, mix ratio, size,texture of coarse & fine aggregate, method of compaction, curing period. 2. The mix ratio 1:0.75: 1.5 gives higher strength than other with sufficient workability.
2. Specific size of coarse aggregate may be specified. 3. Lower limit is waived when air entrained concrete is not required. 4. The mixture will be capable of demonstrating a laboratory compressive strength at 28 days of 1000 psi (7 MPa) + 0.18 R*. Compressive strength will be determined based
mixture, having the compressive strength of about 80 MPa, was modified to produce reductions in density of concrete by replacing varying amounts of the coarse aggregate with expanded polystyrene beads. Using 200 mm concrete cube specimens, the bearing strength of polystyrene aggregate concrete was determined. Square and circular
Concrete compressive strength for general construction varies from 15 MPa (2200 psi) to 30 MPa (4400 psi) and higher in commercial and industrial structures. Compressive strength of concrete depends on many factors such as water-cement ratio, cement strength, quality of concrete material, and quality control during production of concrete etc.
Therefore coarse aggregate with combination of both sizes (i.e. 10 and 20 mm) will give better workable concrete and more compressive strength. ii. Shape of aggregate: If shape of concrete aggregate is angular then there is good interlocking of aggregate particles. Hence it gives more compressive strength. If shape of coarse aggregate is sub angular or sub rounded then compressive strength reduces due to .
In order to increase compressive load bearing capacity and life span of these civil engineering structures the compressive strength of concrete should be enhanced. In this regard, the sizes and shapes of coarse aggregate greatly influence the compressive strength of concrete.
obtained was 1.51, while that of coarse aggregate is 2.70. This indicates that coconut shell is lighter than coarse aggregate and more volume of coconut shell will be required to replace equal weight of coarse aggregate in concrete. The bulk density of coconut shell obtained is 648 which far less thanis about
To investigate the effects of aggregate size on the compressive strength of concrete, with particular reference 1) To determine the workability of concrete made from different sized coarse aggregates. 2) To assess the compressive strength of different coarse aggregate sizes on concrete. 1.1.1 SAMPLING (i) Clean the mounds and apply oil
Nov 14, 2017· For concrete with nominal maximum size of aggregate greater than or equal to 1.5 inch [37.5 mm], the preferred minimum core diameter shall be, three times the nominal maximum size of coarse aggregate but it should be at least two times the nominal maximum size of .
The compressive strength of the concretes prepared with basalt aggregate and steel slag aggregate exposed to thermal cycles is expressed in Figure 6. There is a strength reduction of 7 – 20% in both steel slag aggregate concrete and basalt aggregate concrete subjected to 45 thermal cycles.
May 18, 2018· Compressive strength gives an idea of the overall strength and above-mentioned factors. Through conducting this test, one can easily judge the concrete strength psi and quality of concrete produced. Factors affecting compressive strength of concrete:-Coarse aggregate:-
Compressive strength values for replacement of coarse aggregate with barites and cement Table 10 % BRT % SF 3 days 7 days 28 days 0 4 27.4 30.9 40.8 25 4 21.78 29.05 37.46 50 4 23.62 30.21 33.51 5. DISCUSS ON RESULTS 5.1 Normal Concrete Fig.2 Graph showing compressive strength of Concrete for Normal concrete
Different studies were conducted to investigate influence of aggregate content in concrete on compressive strength for a particular type of cement paste and it was found that a gradual decrease in compressive strength is associated with increasing volume of aggregate from 0~20 (volume is measured as a percentage of total volume).
requirements of a structure. The compressive strength of concrete is the most common performance measure used by the engineer in designing buildings and other structures. The compressive strength is measured by breaking cylin-drical concrete specimens in a compression-testing machine. The compressive strength is calculated from the failure load
c. To investigate the feasibility of the combination of coconut shell as coarse aggregate in concrete by determining its compressive strength and durability. d. To investigate the effect of the combination of coconut shell as coarse aggregate in concrete content and length to the workability as lightweight aggregate in concrete. e.
a gradual decrease in compressive strength, split tensile strength, ﬂ exural strength and modulus of elasticity as the percentage of recycled aggregate used in the specimens increased. replacement of natural coarse aggregate by recycled aggregate resulted in 43% savings in the cost of coarse aggregates and 9% savings in the cost of concrete.