### COMPRESSIVE STRENGTH OF CONCRETE CUBES

To determine the compressive strength of concrete specimens prepared and to ... are tested by compression testing machine after 7 days curing or 28 days curing. .... strength = 15 n/mm sq. ???? it makes 2175 psi where as for M15 (1:2:4) its ...

### WHY WE TEST CONCRETE SRTRENGTH AFTER 28 DAYS?

The table below shows the compressive strength gained by concrete after 1, 3, 7, 14 and 28 days. ... When, its strength have reached 99% in 28 days, still concrete continues to gain strength after ... 1 year or 2 year, but it is assumed that concrete may gain its final strength after 1 year. ... Like · Reply · Nov 27, 2014 4:00am.

### How can I interpret compressive strength of ...

But;1) In-situ construction of cure condition is different from the samples.2) Hydration ... that one concrete might achieve another concrete's 28 day strength after, ... 4) But at the end fo the 28 days, compressive strength was under the limit.

### Compressive Strength of Concrete Using Recycled ...

File format:Adobe PDFThe 28-day compressive strengths of 1:3:6, 1:2:4,. 1:11/2:3, 1:1:2 concrete using recycled concrete aggregates were 12.18 Nmm-2, 17.14 .... After casting, the ... Table 3 Compressive strength of NA concrete. (Nmm-2). Mix ratio. Age(days). 7.

### Compressive strength prediction of Portland...

http://www.sciencedirect.com/science/article/pii/S1687404813000783Other method is based on concrete strength at 28-day age. ... MPa over the permissible strength at 28 days for 1, 2, 3, 6 and 12 months, respectively. .... C3A is very low even after 1 year of hydration; C4AF exhibits a rapid short-term strength ...

### Prediction of 28-day Compressive Strength of ...

File format:Adobe PDFMay 2, 2013 ... the early strength obtained after the two-phase curing and the ... The 28-day compressive strength of a concrete can be estimated in ... was developed to predict the compressive strength of cement mortar cube at less than or equal to 28 days [1]. ... Concrete mixes such as 1:2:4, 1:1.5:3, 1:1:2, 1:2.16:2.52, ...

### Computing the Compressive Strength of Concrete...

File format:Adobe PDFdays), which are the ages used to estimate the compressive strength of concrete for construction and showing if .... knowing its strength after 6 hr of its casting. .... which are (1:3:6 , 1:2:4 and 1:1.5: 3) according to the requirements of Iraqi code.

### WHAT is the compressive strength of reinforced ...

Jul 4, 2009 ... The number 15 expresses its compressive strength (after a 28 day cure) of 15 ... The require strength of concrete (1:2:4) is 3300 psi. .... Shall i know the compressive strength of concrete C40 at 7 days , 21days and 28 days?

### Compressive strength of concrete after early...

File format:Adobe PDF1. 2. In modern construction projects it is necessary to work with concrete at a time before its ... this study indicate the 28 day strength of wet cured concrete cubes increased on average by ... loaded up to 90% of their ultimate strength at 1 , 3 or 7 days after casting. .... prominent around 4 weeks after casting, becoming less.

### Concrete Compressive Strength - SlideShare

Feb 13, 2015 ... Concrete Compressive Strength indetails 1. ... 2 Introduction Concrete is basically a mixture of two components: aggregates and paste. ... After fully compacting the concrete into the moulds the specimens are kept under 15 .... In most cases strength requirements for concrete are at an age of 28 days. 4.