Limestone Cements. Why are we doing this? What are they? What s in it for you? Limestone Cements, Holcim (US) Inc.

Transcription

1 Limestone Cements Why are we doing this? What are they? What s in it for you? Limestone Cements, Holcim (US) Inc.

2 NCC Limestone Presentation Cements Why are we doing this? Limestone Cements, NCC, Holcim (US) Inc. 2

3 Greenhouse Gas Allocations by Sector Percent (%) US Territories Residential Commercial Agriculture Industry Electric Power Industry 33.8 Transportatation Cars, 62.8% Med/Heavy Trucks, 21.9% Aircraft, 7.9% Other, 7.5% Source: 2010 GHG emissions allocated to economic sector in the US (EPA 2012) Limestone Cements, NCC, Holcim (US) Inc. 3

4 Greenhouse Gas Emissions World 34,800,000,000 tons United States 5,900,000,000 tons US Transportation 1,600,000,000 tons US Hwy/Street Construction 117,000,000 tons US Pavement Construction 82,000,000 tons Source: FHWA; Reference document for Sustainable Pavement Systems; Chapter 2, Concepts of Pavement Sustainability, page 2-5 Limestone Cements, NCC, Holcim (US) Inc. 4

5 Look at What the Other Guys Say Limestone Cements, NCC, Holcim (US) Inc. 5

6 NCC Limestone Presentation Cements What are they? How do they perform? Limestone Cements, NCC, Holcim (US) Inc. 6

7 What are they? Limestone cements are: Blended cements that contain 5 15% limestone Cements that are accepted in ASTM C595 and AASHTO M 240 Cements that have a history of proven performance Limestone Cements, NCC, Holcim (US) Inc. 7

8 History of Limestone in Cements 1965 cement with 20% limestone in Germany for specialty applications 1979 French cement standards allows limestone additions /-5% limestone blended cements routinely used in Germany 1992 UK specs allows up to 20% in limestone cement 2000 EN creates CEM II/A-L (6-20%) and CEM II/B-L (21-35%) 2008 CSA, A3001 includes PLC containing 5%-15% limestone 2012 ASTM C 595 and AASHTO M240 includes limestone addition of 5 to 15% Limestone Cements, NCC, Holcim (US) Inc. 8

9 Cements Types Commercialized in Europe (According to Cembureau) 100% 80% 60% 40% 20% 0% Year CEM V - Composite Cem & others CEM IV - Pozzolanic CEM III - Blast furnace slag CEM II - Portland-composite CEM II Portland/Limestone CEM II - Portland-fly ash CEM II - Portland-pozzolana CEM II - Portland-slag CEM I - Portland Portland/Limestone Cement (PLC) is the second most used cement in Europe! Limestone Cements, NCC, Holcim (US) Inc. 9

10 What, Why, and How of Portland/Limestone Cements How is it made? A metered portion of crushed limestone is fed to the finish mill along with clinker and gypsum Limestone is softer than clinker and is more easily ground and is concentrated in the fine particles Overall fineness must be higher for equivalent performance Production rate in the mill is reduced Limestone Cements, NCC, Holcim (US) Inc. 10

11 How Limestone Works Particle packing Improved particle size distribution Nucleation Surfaces for precipitation Chemical reactions Only a small amount, but Source: PCA Limestone Cements, NCC, Holcim (US) Inc. 11

12 How Limestone Works Particle packing Improved particle size distribution Nucleation Surfaces for precipitation Chemical reactions Only a small amount, but Source: PCA Limestone Cements, NCC, Holcim (US) Inc. 12

13 How Limestone Works Particle packing Improved particle size distribution Nucleation Surfaces for precipitation Chemical reactions Only a small amount, but Source: PCA Limestone Cements, NCC, Holcim (US) Inc. 13

14 Why 15% Source: PCA Limestone Cements, NCC, Holcim (US) Inc. 14

15 How do Portland/Limestone Cements perform? In all cases we have equal of better performance to the plant s Type I product in: Strength Freeze-thaw Durability Salt Scaling Resistance Shrinkage Limestone Cements, NCC, Holcim (US) Inc. 15

16 How do Limestone Cements perform in the field? Limestone Cements have equal or better performance than C150 cements in: Strength Set Time Water Demand Finishability Equivalent to Type I Limestone Cements, NCC, Holcim (US) Inc. 16

17 There has to be a catch... Can I still use my normal amount of slag or flyash? Do I have to change my admixture? Do I have to change my saw cutting? Limestone Cements, NCC, Holcim (US) Inc. 17

18 States That Have Adopted Using Limestone Cements WA MT ND VT NH ME OR CA NV ID UT WY CO SD NE KS MN WI IA IL MO MI IN OH WV KY NY PA DC VA MA RI CT NJ DE AZ NM OK AR TN* NC** SC MD MS AL GA TX* LA AK FL HI Status as of March 1, 2014 * Accepted but will not be published until later in the year ** Limestone percent (%) not to exceed 12% States that have adopted using limestone cements States that have not adopted using limestone cements Limestone Cements, NCC, Holcim (US) Inc. 18

19 Wisconsin Paving Project Project: I-94 in Eau Claire, Wisconsin Contractor: Chippewa Concrete Services Volume: 8,000 tons or 40,000 cubic yards to date Limestone Cements, NCC, Holcim (US) Inc. 19

20 Over 200 Miles of Paving Using Limestone Cements WA MT ND VT NH ME OR CA NV ID UT WY CO SD NE KS MN WI IA IL MO MI IN OH WV KY NY PA DC VA MA RI CT NJ DE AZ NM OK AR TN NC SC MD MS AL GA TX LA AK FL HI Status as of January 1, 2014 States that have used limestone cements for paving States that have not used limestone cements for paving Limestone Cements, NCC, Holcim (US) Inc. 20

21 Oklahoma Paving Project Project: Beckham Weigh Station, Oklahoma Limestone Cements, NCC, Holcim (US) Inc. 21

22 Ternary Blends Pavement Mixes Only WA NH OR ID MT WY ND SD MN WI MI VT NY ME MA RI CA NV AZ UT CO NM NE KS OK IA MO AR IL PA IN OH DC WV VA KY TN NC SC NJ DE MD CT MS AL GA TX LA AK FL HI Status as of March 1, 2014 Ternary Mixes Allowed Ternary Mixes Not Allowed Limestone Cements, NCC, Holcim (US) Inc. 22

23 Environmental Impact Limestone cements are designed to replace portland cement without changing your operation at all Just Lower Environmental Impact Limestone Cements, NCC, Holcim (US) Inc. 23

24 The Future People will change if: It is good for the environment It does not make life more complicated It is every bit as good as what you were using It does not cost more Limestone Cements Fit These Requirements Limestone Cements, NCC, Holcim (US) Inc. 24

25 The Future Will Not Look Like the Past What Can We Do to Prepare? Be Open to Change Modify our Standards and Specifications Recognize that our Future is tied to the Environmental Impact of our Products Limestone Cements, NCC, Holcim (US) Inc. 25