D ECLARATION OF PERFORMANCE (DOP) AND CE MARKING OF CEMENT MORTARS MADE WITH RECYCLED STEEL WASTE
I. S ANTAMARÍA -V ICARIO , S. G UTIÉRREZ -G ONZÁLEZ , V. C ALDERÓN -C ARPINTERO AND A. R ODRÍGUEZ -S AIZ (2019). B UILDING & M ANAGEMENT , 3(2): 06-15
B UILDING & M ANAGEMENT
V OLUME 3 I SSUE 2 M AY - A UGUST 2019
Breaking
load un-
der shear
stress (kN)
Initial
shear
strength,
f voi
(N/mm 2 )
MSwr1 21.31 0.403
MSwr2 21.82 0.413
MSwr3 20.45 0.387
MSap1 35.72 0.677
MSap2 27.95 0.530
MSap3 26.51 0.502
Initial
average
shear
strength, f vo
(N/mm 2 )
0.401
MSwr
0.320
MSap
0.570
ʎ (W/m·K)
Avg. Tª (ºC)
Initial
characteristic
shear
strength, f vok
(N/mm 2 )
0.456
Samples
1-2 10.70
Samples
3-4 9.98
Samples
5-6
Samples
1-2
Samples
3-4
Samples
5-6
0.59±0.02
10.27
0.57±0.02
10.14 0.51±0.02
10.71 0.60±0.02
10.09
10.31
10.12
0.64±0.02
0.56±0.02
0.61±0.02
0.60±0.02
Table 6. Thermal conductivity coefficient
Table 5. Initial and characteristic shear strength
MSwr 1
Shear stress breakage of the brick/mortar
bond MSwr 2
Shear stress breakage of the brick/mortar
bond MSwr 3
Shear stress breakage of the ceramic brick
MSap 1
Shear stress breakage of the ceramic brick MSap 2
Shear stress breakage of the ceramic brick MSap 3
Shear stress breakage of the ceramic brick
Figure 6. Types of shear stress breakage in the different samples
The standard indicates that, in addition to the initial shear
stress value, the type of breakage of the test samples has to
be specified. Fig. 6 shows the type of breakage that occurred:
in some cases, breakage of the brick/mortar bond, on other
occasions breakage of the brick sample.
7.4. F IRE RESISTANCE
The non-combustibility test results (Table 7) confirmed that the
samples produced no continuous flame, the oven temperature
increased was less than 30ºC (ΔT≤30ºC) and the mass loss
was less than 50% (Δm≤50%). According with this results and
the requirements of standard EN 13501-1:2007 [25] the
mortars can be classified as Euro-class A1 (a non-combustible
materials that will not at any stage add to the fire, including
the totally developed fire).
7.3. T HERMAL CONDUCTIVITY
The faces of the specimens were polished until perfectly flat
before the start of the test. The samples were grouped by
each mortar type (MSap and MSwr) into three pairs, in other
words, three tests were completed for each mortar type. The
average temperature values of the test and the thermal
conductivity coefficient, ʎ (W/m·K), are shown in Table 6.
The thermal conductivity values were very similar in both
mortars. These values represent approximately half of the
tabulated value, normally set at a density of 2100 kg/m 3 :
1.20 W/m∙K for cement mortars.
ΔT (ºC) Flame persistence (s) Δm (%)
MSwr 4.8 --- 7.53
MSap 4.5 --- 7.46
Table 7. Coefficient of thermal conductivity
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