The tower is still under construction and exposed to external climate. Curing compound was applied after final finishing of concrete surface. We suspect plastic shrinkage cracks due to evaporation rate exceeding bleeding rate of concrete as the mix contains high amounts of supplementary...
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...
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?
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...
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...
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
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...
I would come back again on this,
1. The structures affected are Piers and Wharves. Resting on series of vertical and raker precast piles, precast beams and deck planks, we have in-situ concrete deck 180mm avg thickness.
2. There lies above the concrete deck, a 4mm thick hot-applied...
I have found rubberised cold applied bituminous sealer. Will this be a better option than hot-applied sealer?
Two course chip seal? pls elaborate. We have asphalt design mix with 3/4'' (10%), 3/8'' (35%), crushed sand (40%), filler (5%).
What will be the most durable solution for this...
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...
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...
