Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
Staff Directory
ACI World Headquarters 38800 Country Club Dr. Farmington Hills, MI 48331-3439 USA Phone: 1.248.848.3800 Fax: 1.248.848.3701
ACI Middle East Regional Office Second Floor, Office #207 The Offices 2 Building, One Central Dubai World Trade Center Complex Dubai, UAE Phone: +971.4.516.3208 & 3209
ACI Resource Center Southern California Midwest Mid Atlantic
Feedback via Email Phone: 1.248.848.3800
ACI Global Home Middle East Region Portal Western Europe Region Portal
Home > Tools > Frequently Asked Questions
Q. Is the permeability or shrinkage affected by the water-cementitious material ratio? A. The lower the w/cm, the less the degree of interconnection of the voids in the concrete leading to reduced permeability. Shrinkage is mainly affected by the water and paste contents. If the concrete with low w/cm also has a low water and paste content, less shrinkage would be expected. References: SP-1(02); SP-108; ACI 209.1R-05; SP-227 Topics in Concrete: Concrete Fundamentals; Durability; Permeability; Shrinkage
Q. Is the permeability or shrinkage affected by the water-cementitious material ratio?
A. The lower the w/cm, the less the degree of interconnection of the voids in the concrete leading to reduced permeability. Shrinkage is mainly affected by the water and paste contents. If the concrete with low w/cm also has a low water and paste content, less shrinkage would be expected.
References: SP-1(02); SP-108; ACI 209.1R-05; SP-227
Topics in Concrete: Concrete Fundamentals; Durability; Permeability; Shrinkage
Search other resources on the ACI website for answers to technical questions