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  1. concretebaby

    Full depth concrete cracks (water leaks)

    Dear All, We have noticed the leakage from casted concrete slabs for a tower building when it rained heavily recently. The cracks seems not be be visible by naked eye since the day of pouring. The issue of leakage is almost in all slabs casted since last 6-8 months! nobody noticed big cracks by...
  2. concretebaby

    Maximum allowed Ambient Temperture for Concreting

    Hi What is the maximum allowed air temperature for concreting works? Is there any standard ASTM ACI or BSEN specifying maximum allowed ambient temperature for concrete works?
  3. concretebaby

    Time between concrete cast in two lifts (layers)

    Hello All, A large raft (7,000 m3)is to be cast in two lifts with each layer thickness of 1.5 to 2.0 meters. The mix contains Flyash and Microsilica with strength of 40 Mpa (ASTM). We would like to know what shall be the minimum time gap between casting next layer (second and final layer). The...
  4. concretebaby

    Bleeding on concrete

    HI Lean concrete mix poured in a slab, 50 cm thick. Upon casting considerable bleed water appear on the surface (pic attached). The concrete mix tested for fresh properties like slump, air content, bleeding and found to be ok. The slump is about 18 cm and no bleeding observed at all. But why...
  5. concretebaby

    Cracks on column peirs

    Hi all, We have noticed cracks (as attached file) in column pier upon removal of insulation sheets. Please advise on possible reasons for such cracks. Thanks https://files.engineering.com/getfile.aspx?folder=d25b6bae-f06e-429e-996b-f99612bcd737&file=Cracks-column_pier.png
  6. concretebaby

    316 Stainless Steel Access Ladders

    Dear All, The contract specs recommend to use 316 grade stainless steel for marine access ladders. The marine project calls for repair and restoration of Piers and Wharves for a Naval Base. Given the 10 year guarantee clause for the project, We the Contractors are doubtful about the Quality...
  7. concretebaby

    Asphalt Crack Repair

    Dear All, We have a concrete deck paved with asphalt wearing course 50mm thick. There is a 4mm thick waterproofing membrane between the concrete deck and the BWC. Due to the debonding effects and low compaction, some of the paved areas are cracked. What is the best solution to fix-up these...
  8. concretebaby

    base course aggregate compaction

    Dear All, How many passes a 14 Tonne vibratory roller should make to achieve 100% compaction for base course aggregate? The MDD is 2.315 T/cum, OMC = 7%. Please help as the site is facing serious delays because of less compaction achieved even after 5-6 full passes. The maximum compaction...

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