ACI 238.1R-08

This report provides a comprehensive view of workability of fresh concrete and a critical review of the tests available to measure workability and rheological performance of fresh concrete. The report discusses the factors affecting the performance of fresh concrete and provides a better understanding

of the issues related to the design of workable concrete, from no flow (zero-slump) to flow like a liquid (self-consolidating concrete).



Keywords: 238108

Contents:

Chapter 1--Introduction, p. 238.1R-2

Chapter 2--Rheological terms related to concrete,

p. 238.1R-2

2.1--Notation

2.2--Definitions

2.3--Shear flow curves

Chapter 3--Test methods, p. 238.1R-4

3.1--Introduction

3.2--Principles of measurements

3.3--Description of existing test methods

3.4--Criteria for evaluating test methods

Chapter 4--Factors affecting workability of concrete, p. 238.1R-44

4.1--Introduction

4.2--Effects of cement

4.3--Effects of water content

4.4--Effects of aggregates

4.5--Effects of chemical admixtures

4.6--Effects of supplementary cementitious materials

4.7--Effect of mixing procedure

4.8--Effects of temperature and time

Chapter 5--Examples of using workability test methods, p. 238.1R-52

5.1--Use of gyratory tester to measure workability of noslump concrete

5.2--Using rheological measurements to solve problem with flooring grouts

5.3--Measuring batch-to-batch consistency of selfconsolidating concrete

5.4--Troubleshooting self-consolidating concrete mixtures

5.5--Use of rheological approach to optimize cement based grout for underwater crack injection of damaged bridge

Chapter 6--References, p. 238.1R-64

6.1--Referenced standards and reports

6.2--Cited references