PSI - Issue 11

Bárbara Belén Raggiotti et al. / Procedia Structural Integrity 11 (2018) 36–43 Raggiotti et al./ Structural Integrity Procedia 00 (2018) 000 – 000

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behavior of zeolite with a normal cement and one compound that is allowed by the standard to have two or more admixtures in its composition, such as pozzolan, slag, and calcareous filler up to 35%. Table 2 shows the characteristics of the cements.

Table 2. Characteristics of the cements Designation

NPC

CPC

IRAM 50,000 denomination

NPC40

CPC40

Density [g/cm 3 ]

3.15 3869

3.10 4008

Specific surface [cm 2 /g] Retained in Sieve #200 [%] Loss from calcination [%]

0.0

0.6

3.74 2.00 1.65 2.43

4.00 2.50 2.64 5.50

Insoluble waste [%]

SO 3 [%] MgO [%]

• Coarse aggregate: Crushed coarse aggregate of local origin was used (Córdoba, Argentina).

• Fine aggregate: Sand from the Suquía River paleochannel in Córdoba, Argentina, was used. Coarse and fine aggregates found within the limit curves of IRAM 1627 (1997) Standard. Table 3 shows the characteristics of the aggregates.

Table 3. Characteristics of the aggregates

Apparent relative density of the saturated aggregate and dry surface IRAM 1533:2002

Type of aggregate

Maximum size [mm] IRAM 1505:2003

Fineness module IRAM 505:2003

Absorption [%] IRAM 533:2002

Coarse

19

-

2.73 2.66

1.15 0.86

Fine

-

3.15

• Additive: A plastifying additive for concrete was used based on chemical lignosulfonates. The density of the additive is 1.2 Kg/l. • Zeolite: The zeolite used is a porous aluminosilicate corresponding to class F pozzolan as per the chemical composition compared to that expressed in ASTM C618 Standard (2015). The main characteristics have been described in Section 3. • Water: The water employed was from the water supply network which fulfills the requirements established by CIRSOC 201 Regulation (2005) and IRAM 1601 Standard (2012). The criteria and concepts of CIRSOC 201 Regulation (2005) were used in the design of the mixtures as relates to the levels of resistance to compression and the concepts of granular packing. Table 4 shows the dosages used. Each mixture was designated by two letters and a number. The first letter is "Z" and corresponds to zeolite; the second letter refers to the type of cement, "N" for normal cement and "C" for compound cement. The number indicates the percentage of weight of cement replaced by zeolite. Concrete designated as ZC15 means it has compound cement and that 15% of the cement has been replaced by zeolite. Additive was used with a dosage of 0.35% of the weight of the binder material, that is, cement plus zeolite. The w/bm (water - binder material) ratio remained constant at 0.41. 6. Dosages