Waterton Dam June, 2014

Transcription

1 Mark Schultes, P.Eng. Waterton Dam June, 2014 Spillway Construction Joint Failure Repair Options Investigation (Contract # )

2 Outline 1. Background 2. Scope of Work 3. Spillway Joint Repair Investigation 4. Questions

3 Location

4 Facility Description

5 Facility Description

6 Facility Description

7 Facility Description

8 (from MPE 2007) Existing Joint Conditions

9 Past Assessments 2008 Dam Safety Review 2010 KCB Assessment

10 Scope of Work Research and identify spillway joint sealant products Joint sealant pilot test installation Pilot test monitoring program Full scale cost estimate

11 Product Research and Identification Parameter Sikaflex 2C NS EZ Mix Submerseal Wabo Evazote UV Prime Flex 900 XLV Minimum Joint Width (mm) Not Specified Maximum Joint Width (mm) Not Specified Allowable Compressive Strain (%) Not Specified Allowable Tensile Strain (%) Not Specified Tensile Strength (MPa) Tear Resistance (N/mm) 7.88 Not Specified Minimum Substrate Installation Temperature ( o C) (-7 if using cold weather bonder) Not Specified Sikaflex Submerseal Wabo Evazote Prime Flex

12 Joint Repair Design Submerseal Prime Flex Evazote Sikaflex

13 Pilot Test Installation

14 Joint Preparation

15 Sikaflex 2C NS EZ Mix

16 Submerseal

17 Wabo Evazote UV

18 Prime Flex 900 XLV

19 Pilot Test Monitoring Program Criteria # Parameter Evaluated Property Method/Measurement When/Duration Indication of Successful Outcome Comments 1 Resistance to tear out. Durability/Leakage Identify, measure, photograph, and document areas of seal loss or projection including location, width (full or partial), projection height (or if full loss) and length of loss or projection. Semi-annually (minimum for 5 years, 10 years preferred) and after various spillway operating flows, up to the design flow. No areas of complete seal loss or tearing failure along the joint Resistance to bond failure at the concreteseal interface. Scour/erosion of seal material. Cracking, rupture, shrinkage and hardening. Leakage Durability Durability/Leakage Identify, measure, photograph, and document any areas of bond failure (loss of adhesion, peeling etc.) including location, length, width and depth (use a feeler gauge). Identify, measure, photograph and document length, width and depth of any obvious wear along the joint seal surface. Identify, measure, photograph and document length, width and depth of any obvious cracking, ruptures, shrinkage or hardening (brittleness) along the joint seal surface. Semi-annually and after various spillway operating flows, up to the design flow. Semi-annually and after various spillway operating flows, up to the design flow. Semi-annually No areas of full depth bond failure along the joint. No areas of full depth erosion/scour along the joint. No areas of full depth cracking/rupture along the joint. 5 Flow failure or softening. Durability Identify, measure, photograph and document length, width and depth of any obvious softening and flow of seal material out of the joint. Semi-annually No areas of full depth seal loss along the joint. Likely only applies to the longitudinal joint (typically gravity, water pressure related). 6 Joint width and concrete edge condition. Durability/Leakage Measure joint width and surface temperature at all slab locations. Document any signs of concrete edge spalling or failure that could negatively impact the joint seal. Semi-annually, Ideally under similar temperature conditions as the pilot test installations (between 1 o C and 12 o C, fall and spring). Not explicitly seal related but will impact overall joint performance. Compare with the installation width (and temperatures) to determine joint trend (opening/closing) and relative change.

20 Conclusion Product Installation Rate (min/m) Total Estimated Cost (CAD) Estimated Cost Per Meter (CAD) Sikaflex 2C NS EZ Mix 3.3 $1,170,000 $334 Wabo Evazote UV 4.9 $1,181,000 $337 Prime Flex 900 XLV 4.3 $1,630,000 $466 Submerseal 2.6 $1,678,000 $479 Sikaflex Wabo Evazote Prime Flex Submerseal

21 ? Questions