Moraes et al 2019a - Revision history

Materiales.Compuestos at 20:10, 27 October 2022

2022-10-27T20:10:45Z

Materiales.Compuestos at 20:10, 27 October 2022

2022-10-27T20:10:16Z

Scipediacontent at 11:14, 7 May 2022

2022-05-07T11:14:34Z

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Scipediacontent: Scipediacontent moved page Draft Content 414953604 to Moraes et al 2019a

2022-03-31T18:59:48Z

Scipediacontent moved page Draft Content 414953604 to Moraes et al 2019a

Scipediacontent: Created page with "== Abstract == The proposal of this work is to study materials, which initially were classified as disposable, in building construction as new alternative materials. In this..."

2022-03-31T18:59:45Z

Created page with "== Abstract == The proposal of this work is to study materials, which initially were classified as disposable, in building construction as new alternative materials. In this..."

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== Abstract ==

The proposal of this work is to study materials, which initially were classified as disposable, in building construction as new alternative materials. In this way, this research studied the partial replacement of Portland cement in mortars by the following pozzolans: sugar cane bagasse ash (SCBA), rice husk ash (RHA), metakaolin (MK) and silica fume (SA). Theses composites were compared with a control mixture, which no Portland cement replacement, in the following tests: compressive strength, consistency, water capillarity and water immersion.   The replacements percentages carried out were 5, 10, 15, 20, 25 and 30% for SCBA, RHA and metakaolin, and 5, 10 and 15% for silica fume by weight. The compressive strength test was performed at curing times of 3, 7, 28 and 90 days, whereas water capillarity and water immersion were carried out at 28 days. In the early ages, few mixtures showed resistance above the reference, but with 90 days, six mixtures passed the control. All mixtures with pozzolans presented less water absorption by immersion and capillarity. Sustainably, the use of SCBA, RHA, MK and SA is viable.

== Full document ==
<pdf>Media:Draft_Content_414953604native-articles-234.pdf</pdf>

@@ Line 1: / Line 1: @@
-=='''1''' Introduction==
+==1 Introduction==
 Pozzolan is a material known since the Roman Empire, which were mixed with lime to produce compounds with cementitious properties. Currently, these pozzolans are classified as “natural pozzolan”, since there were basically a kind of volcano tuff, extracted mainly of the Pozzuoli region, hence the name pozzolan [1]. The “artificial pozzolan” is a pozzolan derived from human activities, a byproduct or waste from different industries. This work studied four artificial pozzolans from different sources as partial replacement of Portland cement in mortars: sugar cane bagasse ash (SCBA), rice husk ash (RHA), metakaolin (MK) and silica fume (SA).
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 In this way the aim of this research is to study the SCBA, RHA, MK and SA as a sustainable mineral admixtures for cement partial replacement by means of compressive strength, workability and water absorption analyses, comparing the pozzolan-content mortars with a control mixture, no Portland cement replacement.
-=='''2''' Experimental Section ==
+==2 Experimental Section ==
 The materials used in this research were the Brazilian cement CP V – ARI, presenting no pozzolan, sugar cane bagasse ash (SCBA), a noncommercial material, produced by auto-combustion process in a furnace, then milled and sieved, rice husk ash (RHA), metakaolin (MK) and silica fume (SA), obtained commercially.
@@ Line 26: / Line 26: @@
 Water absorption analyses were carried out regarding to capillarity and immersion of the specimens after 28 curing days at 25°C. The tests were performed by following the Brazilian standards NBR 9779 [10] and NBR 9778 [11], respectively.
-=='''3''' Results ==
+==3 Results ==
 ==='''3.1''' Compressive strength of mortars ===
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 <span style="text-align: center; font-size: 75%;">'''Figure 8. '''Water absorption by capillarity (g/cm²) x immersion time (hour) - SA specimens.</span></div>
-=='''4''' Conclusions ==
+==4 Conclusions ==
 The blended admixture presented a continuous increasing with curing time. The pozzolans contributed to the mechanical behavior, since no compressive strength decay proportionally to the cement replacement. In long ages, mortars containing pozzolans presented similar or higher compressive strength than the no replacement specimens. The fineness in the blended admixtures leads to a dryer mortar, but improves the durability of the cementitious matrix, the specimens containing

@@ Line 1: / Line 1: @@
 =='''1''' Introduction==
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 <span id='_Hlk481740546'></span>This test was performed on specimens after 28 curing days, measurements were taken 24, 48 and 72 hours from the start of the test. '''Figure 1''' shows the percentage of absorption (%) in relation to the time (hour) which the measurement was taken for the SCBA-content specimens.
+[[File:Moraes_et_al_2019a-image5.png|centre|600x600px]]
-[[Image:Moraes_et_al_2019a-image5.png|600px]]
 <div id="_Hlk481747655" class="center" style="width: auto; margin-left: auto; margin-right: auto;">
@@ Line 356: / Line 299: @@
 It’s possible to observe the effect of the fineness in the blended admixtures, it leads to a dryer mortar, but improves the durability of the cementitious matrix by lowering the water absorption.
+[[File:Moraes_et_al_2019a-image6.png|centre|600x600px]]
-[[Image:Moraes_et_al_2019a-image6.png|600px]]
 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
-<span style="text-align: center; font-size: 75%;">'''Figure 2. '''Water absorption x immersion time (hour) - RHA specimens</span></div>
+<span style="text-align: center; font-size: 75%;">'''Figure 2. '''Water absorption x immersion time (hour) - RHA specimens.</span></div>
 <div id="_Hlk481749591" class="center" style="width: auto; margin-left: auto; margin-right: auto;">
@@ Line 368: / Line 310: @@
 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
-<span style="text-align: center; font-size: 75%;">'''Figure 3. '''Water absorption x immersion time (hour) - MK (a) and SA (b) specimens</span></div>
+<span style="text-align: center; font-size: 75%;">'''Figure 3. '''Water absorption x immersion time (hour) - MK (a) and SA (b) specimens.</span></div>
 The admixtures containing MK also showed lower absorption than the control mortar as shown in Figure 3 (a). The mortars containing SA presents the specimens with lower water absorption as shown in Figure 3 (b).
@@ Line 375: / Line 317: @@
 This test was performed on specimens after 28 curing days, measurements were taken 3, 6, 24, 48 and 72 hours from the start of the test. The water absorption by capillarity (g/cm²) x immersion time (hour) for the SCBA-content specimens is shown in '''Figure 4.'''
+[[File:Moraes_et_al_2019a-image8.png|centre|600x600px]]
-[[Image:Moraes_et_al_2019a-image8.png|600px]]
 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
-<span style="text-align: center; font-size: 75%;">'''Figure 4. '''Water absorption by capillarity (g/cm²) x immersion time (hour) - SCBA specimens</span></div>
+<span style="text-align: center; font-size: 75%;">'''Figure 4. '''Water absorption by capillarity (g/cm²) x immersion time (hour) - SCBA specimens.</span></div>
 The admixtures containing 10% and 20% of cement replacement by SCBA presented a similar water absorption   as mortar with no pozzolan. SCBA 5, 15, 25 and 30 maintained a lower water absorption.
 Samples containing the RHA pozzolan exhibited a lower water absorption by capillarity and immersion.
+[[File:Moraes_et_al_2019a-image9.png|centre|600x600px]]
-[[Image:Moraes_et_al_2019a-image9.png|600px]]
 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
-<span style="text-align: center; font-size: 75%;">'''Figure 5. '''Water absorption by capillarity (g/cm²) x immersion time (hour) - RHA specimens</span></div>
+<span style="text-align: center; font-size: 75%;">'''Figure 5. '''Water absorption by capillarity (g/cm²) x immersion time (hour) - RHA specimens.</span></div>
+[[File:Moraes_et_al_2019a-image10.png|centre|600x600px]]
-[[Image:Moraes_et_al_2019a-image10.png|600px]]
 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
@@ Line 402: / Line 341: @@
 The finesses of the pozzolan provides dryer mortars, but also improves the durability of the matrices, which is possible to observe as the pozzolans which presented a lower diameter in the consistence test, also showed a lower water absorption.
+[[File:Moraes_et_al_2019a-image13.png|centre|600x600px]]
-[[Image:Moraes_et_al_2019a-image13.png|600px]]
 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
-<span style="text-align: center; font-size: 75%;">'''Figure 8. '''Water absorption by capillarity (g/cm²) x immersion time (hour) - SA specimens</span></div>
+<span style="text-align: center; font-size: 75%;">'''Figure 8. '''Water absorption by capillarity (g/cm²) x immersion time (hour) - SA specimens.</span></div>
 =='''4''' Conclusions ==

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