A Practical Equation for the Elastic Modulus of Recycled Aggregate Concrete

Round 1

Reviewer 1 Report

Line 37: due to the old mortar and crushed bricks in coarse, if mortar with CaSO4 or bricks are into re Recycled material it could be a problem.

 

Line 80. Ρod first mentioned, not described before

 

Line 91: says the specific conversion factor 1.12 to obtain the 150 mm cube compressive 91

strength. Where does it come from? Reference?

 

Line 95: … the size effect of strength is significant…What do they mean?

 

Line 114: Table 2. Physical property requirements of the performance-based classification.  For instance: >2450 Does it mean ≥2450 or <3 means ≤3?

 

Line 130: basalt, limestone, and igneous stones? Are they included?

 

Lines 153, 154 and 155: Why these equations do not present numbers as 13, 14 and 15?

 

Line 170: … 3 groups of control concrete are prepared with water to cement ratios of 0.6, 0.5 and 0.4, respectively…The references are actual, but the ratios 0.6 and 0.5 are not longer used in Durability designs, and Durability designs began almost 20 years ago

 

Lines 257 to 262, maybe reconsider to name the equations 15.1…. 15.6, better complete numbers 15, 16, 17 and so on

 

2.87: … the range [0.552ENAC,pred, 1.168ENAC,pred]… there is a huge difference

 

The paper has a very important review of articles to present the equations. Maybe the highlights in the lines could be improved or explained. As the paper is not too long, maybe the supplementary tables could be inserted in text like figures

Comments for author File: Comments.pdf

Author Response

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Reviewer 2 Report

This article proposed a practical equation for estimating the elastic modulus of RAC based on a comprehensive statistical analysis on hundreds of publications. The proposed modified equation can be used to estimate the elastic modulus of RAC accurately considering multi factors. This paper is interesting with a well-organized structure and excellent language. It can be accepted by the journal of Buildings after considering the following several comments:

Please add the relevant references for the tables and figures.

Line 133: The authors stated that the correction factor α in Eq. (11) is introduced to Eq. (10). However, in Eq. (10), there is no α. Besides, what is Econtrol in Eq. (11)? Please make the statement and equations more clearly.

Line 263: Please extend the description of this part. Two lines are too short.

Author Response

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