Title:
Concrete Q&A: Slump Requirements per ACI 301 and Roughening of Existing Concrete to 1/4 in. Amplitude per ACI 318
Author(s):
Publication:
Concrete International
Volume:
41
Issue:
5
Appears on pages(s):
72
Keywords:
DOI:
10.14359/51716786
Date:
5/1/2019
Abstract:
Q. ACI 301-101 calls for the slump to be proportioned to 2 to 4 in. (50 to 100 mm) prior to a high-range water-reducing admixture (HRWRA) being added and calls for a maximum slump of 8 in. (200 mm) at the point of delivery after the addition of the admixture. How is this handled when a HRWRA is added at the batch plant prior to arriving at the site?
Q. When does ACI 318-141 require a 1/4 in. (6.4 mm) amplitude on existing concrete before new concrete is placed against it?
Related References:
1. ACI Committee 301, “Specifications for Structural Concrete (ACI 301-10),” American Concrete Institute, Farmington Hills, MI, 2010, 77 pp.
2. ACI Committee 301, “Specifications for Structural Concrete (ACI 301-16),” American Concrete Institute, Farmington Hills, MI, 2016, 77 pp.
3. ASTM C143/C143M-15, “Standard Test Method for Slump of Hydraulic-Cement Concrete,” ASTM International, West Conshohocken, PA, 2015, 4 pp.
4. ASTM C1611/C1611M-14, “Standard Test Method for Slump Flow of Self-Consolidating Concrete,” ASTM International, West Conshohocken, PA, 2014, 6 pp.
5. ACI Committee 117, “Guide to Design of Slabs-on-Ground (ACI 117-10) (Reapproved 2015),” American Concrete Institute, Farmington Hills, MI, 2010, 76 pp.
6. ASTM C94/C94M-15, “Standard Specification for Ready-Mixed Concrete,” ASTM International, West Conshohocken, PA, 2015, 14 pp.
7. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 519 pp.