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TECHNICAL PAPER

(a) (b)

Figure 1: Ready-mixed concrete with RCA used in foundations (a) and in columns and walls (b).

cooperation with the design engineer, the contractor, the RCA experiments with fresh concrete and part of the compressive
supplier, and the concrete ready-mix plant. For this project, 37% strength testing were carried out on the RMC plant. The other
of the coarse aggregate was replaced with RCA 10/20 mm, for tests were carried out at SINTEF (earlier Norwegian Building
the in-situ cast concrete of quality C35 in all foundations and 50 Research Institute).
% of the basement walls and columns, shown in Figure 1. The
remaining walls and columns of the basement was cast using table 1: overview of the properties tested in the
100% natural aggregates to allow for a comparison between experimental program
the two concrete mixes. Extensive testing of the properties of
both aggregates, fresh and hardened concrete properties were ProPErtIEs tEst rcA frEsh hArDEnED
carried out. Construction started in the summer of 2001, and the MEthoD concrEtE concrEtE
school was ready for use by the students in the fall of 2003, see Particle size NS-EN933-1 X
Figure 2. The whole demonstration project consumed 800 m of Material EN-933-11 X
3
concrete with RCA. constituents
Particle density NS-EN X
1097-6
Water absorption NS-EN X
1097-6
Chloride content NS-EN X
1744-1
Sulphate content NS-EN X
1744-1
Slump by time NS 3662 X
Spreading by NS 3664 X
time
Density NS 3660 X
Figure 2: Sørumsand High School.
Air content NS 3659 X
3. MatErialS anD MEtHoDS Compressive NS 3668 X
3.1 overview of Experimental program strength
Both aggregate, fresh and hardened concrete were investigated, Shrinkage ASTM C X
see Table 1. The aggregate tests were sampled at BA 157-93
Gjenvinning recycling facility from “pure concrete” which was E-module NS 3676 X
produced specifically for the project. The concrete for the test Frost resistance SS 137244 (IB) X
program for fresh and hardened properties was taken directly
from the ready-mix concrete plant (Unicon). Samples were taken Carbonation In-house X
from recipes with 0 % RCA (C35-N) and 37% RCA (C35-R). The method

The IndIan ConCreTe Journal | SepTember 2019 31