Concrete Compressive Strength Variation with Time
As per studies and researches, the compressive strength of the concrete will increase with age. Most researches were conducted to …
New Views on Effect of Recycled Aggregates on Concrete Compressive Strength
A predictive equation is given for compressive strength when recycled coarse aggregates are used. The w/c and replacement ratio are the capital factors affecting concrete compressive strength. Their effect is significantly modified by the properties and composition of the recycled aggregates used. An equation that accurately predicts …
Internal Curing Effect and Compressive Strength …
In order to investigate the internal curing effect of recycled brick aggregate (RBA) in recycled aggregate concrete (RAC) and calculate its contribution to the final compressive strength, two RAC groups with different recycled aggregates and 6 replacement ratios (r) under 4 curing ages were tested. Results show that the …
(PDF) Effects of Sand Quality on Compressive Strength of Concrete…
plies th at effect of workability on the compressive strength of concrete is more pronounced in rough and irreg u- lar shaped sand part icles in comparison with rounded and sm ooth sand particles ...
Effects of Environmental Factors on Concrete …
Therefore, the carbonation depth of concrete was negatively related to the strength grade of concrete. This could be verified by the relation curves between the compressive strength of concrete and CO …
Understanding Concrete Compressive Strength …
Concrete is known to be strong and long-lasting, but just how strong it needs to be to do its job varies, depending on the application. The compressive strength of concrete refers to how many pounds per …
Effect of rubber aggregate on reduction ofcompressive strength of concrete
The effect of rubber aggregate on reduction of compressive strength of concrete is about the same as that of air pore with the same volume fraction of rubber aggregate. The reduction rate of ...
The effect of size and shape of pores on the prediction …
In another study, Fred and Cormick [25] examined the effect of sand size on the compressive strength of ed concrete. The used sands had a different modulus of softness (2.1, 2.7, and 3.7). The results indicated that the compressive strength of ed concrete increases with the finer grain size, probably due to the change in the pore size.
Effects of Fibers on Compressive Strength of Concrete
This laboratory analysis was done to scrutinize the compressive strength of nominal mix concrete (NMC) and fiber reinforced concrete (FRC) for M30 grade of …
A review on concrete creep characteristics and its evaluation …
The compressive strength of concrete is heavily dependent on the w/c, and as the compressive strength increases so does the creep resistance. It is well known that a decrease in w/c will increase the compressive strength, and vice versa. ... Basic creep coefficient consists of the functions containing the effect of compressive strength and ...
Effects of expanded polystyrene (EPS) particles on fire …
The compressive strength of ed concrete enhances with an increase in density of the concrete and is decreased with increasing the diameter of voids. Thus, the strength of ed concrete mainly depends on (a) water-cement ratio and (b) air-cement ratio. ... Air-void systems of ed concrete and its effect on mechanical properties. …
Effect of Air Entrained Concrete on Strength of Concrete
Normal reduction in strength of concrete by use of air-entrained admixtures varies from 3 to 7%. This variation of strength shall be considered in the mix design of concrete so that a desired compressive strength is achieved with required amount of admixture and workability. Suitably, trial mix designs should be done to find exact variation of strength …
Effects of Compressive Strength of Concrete on RC …
At 800 °C, the concrete lost its compressive strength drastically, irrespective of the grade of concrete. At 1000 °C, the residual compressive strength …
Effect of elevated temperatures on compressive strength of concrete …
4. Strength changes during drying at elevated temperatures. Generally, the compressive strength of concrete with thermal treatment was affected by two competitive effects [20], [21], [24], [37]. The first was microcracks, which were highly dependent on the tensile strength and would cause a decrease in strength.
Effects of Fibers on Compressive Strength of Concrete
This laboratory analysis was done to scrutinize the compressive strength of nominal mix concrete (NMC) and fiber reinforced concrete (FRC) for M30 grade of concrete. In this study, cubes of NMC prepared by adding fly ash 20% and 30% of the weight of cement. Apart from this, the FRC mix prepared by adding steel and glass fiber …
Effect on Compressive Strength of Concrete Using Treated …
The tests conducted are initial and final setting time on cement, Compressive strength, tensile strength and flexural strength on concrete which is compared with the mix of M30 of potable water.
The Effect of Sea Water on Compressive Strength of Concrete …
Abstract and Figures. This paper presents the experimental investigations on the effect of sea water on the compressive strength of concrete. Cement concrete cubes of 150mm x 150mm x 150mm were ...
Shape and size effects on the compressive strength of high-strength
1. Introduction. By far the most common test carried out on concrete is the compressive strength test. The main reason to understand this fact is that this kind of test is easy and relatively inexpensive to carry out [1].Testing standard requirements use different geometries of specimens to determine the compressive concrete strength, f …
Compressive Behavior of Concrete under Environmental Effects
Concrete strength is fairly sensitive to environmental effects. Extreme weather conditions and changes in humidity rates significantly affect the concrete compressive strength development. Concrete as one of the substantial material used in residential buildings and infrastructures is subjected to a massive strength change …
Electrical conductivity, microstructures, chemical …
Concrete compressive strength comprises between 10.2 and 55 MPa, with a standard deviation of 11.2 MPa, a median of 40.7 MPa, and variance of 125.28 MPa. ... While all factors may have an effect on compressive strength and interact with one another, this is not necessarily the case in all circumstances. As a result, the model must …
Experimental study on the effect of polypropylene fiber on compressive …
The polypropylene fiber reinforced concrete with a fiber length of 6 mm and a content of 0.2% has the best improvement effect on the compressive strength of concrete after experiencing high temperatures. And the peak force loss of the fracture test of each proportion of concrete after experiencing a high temperature of 600 o C exceeds 81%.
The Time Variation Law of Concrete Compressive …
Concrete is a building material that is most widely used because of its excellent mechanical performance and durability. Compressive strength is an essential property of concrete, which …
(PDF) Compressive Strength of Concrete containing
3.1 Mix Design. In this study, the targeted strength of concrete is 60MPa at 28 days with a water/cement ratio of 0.32. and 1 % super plasticiz er. A basic control mix of concrete without eggshell ...
Concrete Compressive Strength
The concrete compressive strength f c and the modulus of elasticity E c were tested according to the Australian Standards AS 1012.9 (1999) and AS 1012.17 (1997), …
Effect of Cube Size on the Compressive Strength of Concrete …
In these expressions, f cu 150 is the compressive strength of concrete measured using 150 mm 3 cubes and is taken as 0.95fcu [27] in the current work. 13 The design philosophy for FRP reinforced ...
Effect of Sugar on Setting Time of Cement and Compressive Strength of
The increments of concrete compressive strength were 22.4%, 19.6% and 20.3% more than plain concrete with 0% sugar in curing period of 7, 14 and 28 days respectively. ... To establish the effect ...
A concrete damage plasticity model for predicting the effects …
At the same time, the influence of the initial static load on dynamic compressive strength of concrete could be reduced when the strain rate was increased. Ref. [26] investigated the dynamic compressive behavior of high-strength concrete with three different strengths: 60 MPa, 80 MPa and 110 MPa, with labels; C60, C80, C100, …
(PDF) Compressive strength of geopolymer …
In order to demonstrate the effects of these varied parameters on the compressive strength of the fly ash-based geopolymer concrete, a comprehensive dataset of 800 samples was gathered and …
Structural effects and real strain-rate effects on compressive strength …
The dynamic increase factor (DIF) of the concrete material strength, obtained using a split Hopkinson pressure bar (SHPB), includes structural effects that do not precisely reflect the real strain-rate effect of concrete. To further clarify the real strain-rate effects of rubberised concrete (RC), an experimental investigation regarding the …
Effect of Glass Fiber on Compressive, Flexural and Spliting Strength …
The ANOVA for compressive strength at 30 days shows that the combined effect of fiber addition and fiber length increased the strength of the samples by 27 % (30.3 MPa).
Size and shape effects on compressive strength of lightweight concrete
The effect of the lateral size and shape (section shape and aspect ratio) of a specimen on the concrete compressive strength was examined according to the unit weight of concrete ranging between 1551 and 2314 kg/m 3. Based on crack band theory, new mathematical equations to predict the concrete compressive strength according …
Effect of strain rate on compressive behaviour of high-strength
The effect of strain rate on the compressive behaviour of high-strength concrete (HSC) after exposure to elevated temperatures was experimentally investigated. 45 HSC prisms were heated up to 20, 200, 400, 600 and 800 °C.The pre-heated prisms were then axially loaded at a quasi-static strain rate of 10 −5 s −1 as well …
Compressive Strength
Compressive strength is an essential property in structural materials, for example, mortar, which comprises the interacial transtition zone in concrete, stone, and steel, since material design is normally evaluated in terms of the risk of compression failure. In addition the CBM is known as having strength for compression force. Therefore plenty of standard tests …
EFFECTS OF COLD JOINT AND ITS DIRECTION ON THE …
This study would test the compressive and flexural strength due to the effect of cold joint in concrete. The period of the casting between two concrete (cold joint) was 120 minutes and 240 minutes ...