Recently , WhatsApp quietly introduced a new
feature that lets users know that their messages
have been read, with the double grey ticks
appearing in front of the messages turning blue.
And now, just as quietly, the mobile messaging
service is
letting users of its Android app disable the
feature with the rollout of WhatsApp version
2.11.444. This version is available for users on
WhatsApp's website for now, and will
eventually be rolled out to all users. Here's how
you can disable the blue coloured read receipts'
with the message timestamp on WhatsApp's
Android app:

1. Make sure that your smartphone is running
on Android 2.1 or a newer version.

2. Go to settings menu and enable 'Download
from Unknown Sources' in the Security tab

3. Go to the WhatsApp website and download
the APK (application) file available Here:
http://www.whatsapp.com/Android/

4. Once the APK file is downloaded to your
device,

5. Tap the 'Install' option.

6. Now that WhatsApp has been updated, select
Settings > Account > Privacy.

7. Under the Privacy tab, un check the Read
Receipts option.
This feature however doesn't apply to group
messages and will let other participants know
when you've read a message. Also, once you
disable this feature, you won't be able to view
blue double-check marks when you send a
message as well.

The feature that enabled the users to see
when their messages were read didn't go down
too well with the users and with this update;
WhatsApp seems to be taking steps to please
users who were not happy with the new feature.

Source:
http://mobimongers..com/2014/11/how-to-disable-whatsapp-blue-ticks-for.html?m=0