Properties of Portland Cement Mortar with Substitutions of Natural and Expanded Perlite

The present research deals with the feasibility of using high-temperature pozzolans such as Natural Perlite (NP) and Expanded Perlite (EP), different dosagues of additions were made to mortars in order to perform their mechanical properties. Mortars were subjected to destructive tests in hardened state: compression, tension, flexion and adhesion strength; as well as non-destructive tests in hardened state: ultrasonic pulse velocity (UPV), electrical resistivity (ER), density (ρ) and total porosity (PT); in addition to attack by sodium sulfate at 90 days. The percentages of the substitutions were 5%, 10%, 15%, 20% and 30% by weight of Portland cement mass (PC) relative to a control mortar (cement-sand-water). With the partial replacement of the cement and according to the tests carried out, it can be observed that the problem of durability and CO2 emissions is significantly reduced and, consequently, an energy saving and a lower environmental impact are promoted.

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The Feasibility of Basalt Rock Powder and Superfine Sand as Partial Replacement Materials for Portland Cement and Artificial Sand in Cement Mortar

Research and Application of Materials Science ◽

10.33142/msra.v1i1.1134 ◽

2019 ◽

Vol 1 (1) ◽

Author(s):

Hongxia Qiao ◽

Desire Ndahirwa ◽

Yuanke Li ◽

Jinke Liang

Keyword(s):

Portland Cement ◽

Mechanical Performance ◽

Cement Mortar ◽

Ultrasonic Pulse Velocity ◽

Ultrasonic Pulse ◽

Pulse Velocity ◽

Partial Replacement ◽

Rock Powder ◽

Research Gap ◽

Basalt Rock

The research gap on the feasibility of basalt rock powder (BRP) and superfine sand (SS) in preparation of cement mortar is significant. Thisstudy examines probable changes occurred in the modified cement mortar due to incorporation of certain quantity of basalt rock powder andsuperfine sand in mixture proportion. The cement mortar included Portland cement, artificial sand and water as principal mixture constituents. Then, basalt rock powder and superfine sand were added as partial replacement materials for Portland cement and artificial sand respectively. Therefore, replacement percentages were 10%, 15%, 20%, 25% and 30% when the basalt rock powder replaced Portland cement and in case the artificial sand was replaced by superfine sand, 10%, 20%, 30%, 40% and 50%. Then, the strength indexes such as flexural strength, compressive strength, ultrasonic pulse velocity and dynamic elastic modulus were investigated. The results show that the presence of basalt rock powder in mixture proportion increased the flexural and compressive strengths of cement mortar however the cement mortar that contained superfine sand illustrated inadequate mechanical performance as flexural and compressive strengths decreased remarkably. Moreover, when basalt rock powder and superfine sand were included together in mixture proportion, the cement mortar’s mechanical performance declined compared to that of the reference cement mortar. Despite the fact that basalt rock powder and superfine sand weakened the cement mortar’s mechanical properties, it was found that they can be added into the cement mortar as partial replacement of Portland cement and artificial sand in the following ratios: from 10% to 25% when basalt rock powder replaces Portland cement and from 10% to 20% when artificial sand is replaced by superfine sand.

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Non-destructive evaluation of strength gain of ordinary portland cement mortar by ultrasonic pulse velocity method

2016 Moratuwa Engineering Research Conference (MERCon) ◽

10.1109/mercon.2016.7480164 ◽

2016 ◽

Cited By ~ 1

Author(s):

S D C De Silva ◽

V Sivahar

Keyword(s):

Portland Cement ◽

Ordinary Portland Cement ◽

Cement Mortar ◽

Ultrasonic Pulse Velocity ◽

Ultrasonic Pulse ◽

Pulse Velocity ◽

Strength Gain ◽

Non Destructive Evaluation ◽

Non Destructive

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Physical Behavior of Ternary Portland Cement Mortar Mixtures Incorporating Pozzolan and Filler

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.789.170 ◽

2018 ◽

Vol 789 ◽

pp. 170-175

Author(s):

Mauricio Arreola-Sanchez ◽

Jorge Alberto Pacheco-Segovia ◽

Hugo Luis Chávez García ◽

Wilfrido Martínez-Molina ◽

Elia Mercedes Alonso-Guzmán ◽

...

Keyword(s):

Portland Cement ◽

Cement Mortar ◽

Ultrasonic Pulse Velocity ◽

Ultrasonic Pulse ◽

Pulse Velocity ◽

Expanded Perlite ◽

Physical Behavior ◽

Cement Mortars ◽

Indirect Tension ◽

Simple Compression

This work shows the results carried out by mixtures of Portland cement mortars with twoadditions: ash brick ovens (CELU) which acting as pozzolan, and ground expanded perlite (PEM)as filler. The objective of this research is to determine whether by adding a pozzolan and fillermixtures base Portland cement is possible to increase physical and mechanical behavior. There were3 mixtures: the control and 2 more: one with substitution of 7% CELU, and other with 7% CELU+5%PEM respectively, carrying out tests of normal consistency, setting, fluency, simple compression,indirect tension, ultrasonic pulse velocity and electrical resistivity at the ages of 3, 7, 14, 28 and 120days. The results were favorable in the mixture that incorporates both materials (CELU+PEM).

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Factors influencing ultrasonic pulse velocity in concrete

Revista IBRACON de Estruturas e Materiais ◽

10.1590/s1983-41952020000200004 ◽

2020 ◽

Vol 13 (2) ◽

pp. 222-247 ◽

Cited By ~ 2

Author(s):

J. P. GODINHO ◽

T. F. DE SOUZA JÚNIOR ◽

M. H. F. MEDEIROS ◽

M. S. A SILVA

Keyword(s):

Portland Cement ◽

Concrete Strength ◽

Ultrasonic Pulse Velocity ◽

Ultrasonic Pulse ◽

Pulse Velocity ◽

Hydrated Calcium Silicate ◽

Degree Of Hydration ◽

Mix Proportion ◽

Non Destructive ◽

Cylindrical Test

Abstract The hydration process of Portland cement triggers reactions of stabilization of minerals from the contact of the clinker with water, which is the Hydrated Calcium Silicate (C-S-H), the Etringite (3CaO.Al2O3.3CaSO4.32H2O) and the Portlandite (Ca(OH)2). In order to understand the effects of the evolution of hydration in cement, it is possible to apply non-destructive tests. In this context, the objective of this work is to evaluate the influence of the type of cement, the curing age, of the format and humidity of the test specimens of concrete in the ultrasonic pulse velocity (UPV). In order to do that, 36 cylindrical test specimens (10 x 20 cm) and 9 cubic ones with 25 cm of edges, with mix proportion of 1:2,7:3,2 (cement/sand/gravel), water/cement ratio of 0.58 and three types of Portland cement (CP II-Z-32, CP IV-32 RS and CP V-ARI) were molded. With data obtained it was possible to correlate the increase of concrete strength along time (at ages of 7, 14, 28, 70 and 91 days) with the increase of the ultrasonic pulse velocity. Besides, it was possible to prove the direct influence of the concrete moisture and of the degree of hydration in the UPV. The shape of the test specimen generally had no influence on the results, except in the case of cement CP V ARI.

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Evaluation of the Electrical Resistivity, Ultrasonic Pulse Velocity and Mechanical Properties in Portland Cement Pastes Type II

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.841.198 ◽

2020 ◽

Vol 841 ◽

pp. 198-202

Author(s):

Judith Alejandra Velázquez Perez ◽

Elia Mercedes Alonso Guzmán ◽

Wilfrido Martínez Molina ◽

Hugo Luis Chávez García ◽

Ioscany Talingo Moreno ◽

...

Keyword(s):

Mechanical Properties ◽

Electrical Resistivity ◽

Portland Cement ◽

Ultrasonic Pulse Velocity ◽

Ultrasonic Pulse ◽

Pulse Velocity ◽

Type Ii ◽

Cement Pastes ◽

Cementing Material ◽

Non Destructive

This research is focused on cement pastes with w/c ratio of 0.5. The cementing material is Portland cement type II. The main aim is to estimate the mechanical properties based on non-destructive tests such as ultrasonic pulse velocity, and electrical resistivity by a correlation with the destructive tests such as compressive strength, flexural strength, and tensile strength at ages of 3,7,14,21,28 and 45 days. The results suggest that there is a good correlation between evaluated properties.

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The Use of Basalt Rock Powder and Superfine Sand as Supplementary Cementitious Materials for Friendly Environmental Cement Mortar

Research and Application of Materials Science ◽

10.33142/msra.v1i1.665 ◽

2019 ◽

Vol 1 (1) ◽

Author(s):

Hongxia Qiao ◽

Desire Ndahirwa ◽

Yuanke Li ◽

Jinke Liang

Keyword(s):

Portland Cement ◽

Mechanical Performance ◽

Cement Mortar ◽

Ultrasonic Pulse Velocity ◽

Cementitious Materials ◽

Pulse Velocity ◽

Supplementary Cementitious Materials ◽

Partial Replacement ◽

Rock Powder ◽

Basalt Rock

The research gap about the application of basalt rock powder (BRP) and superfine sand (SS) as fillers in preparation of cement mortar is significant. This study characterizes the mechanical performance of the cement mortar formulated considering Portland cement, artificial sand and water as principal mixture components. To analyze the influence of BRP and SS on the strength properties of the mortar, the Portland cement and artificial sand have been replaced by BRP and SS respectively. The replacement percentages are 10%, 15%, 20%, 25% and 30% when the basalt rock powder replaces Portland cement and in case artificial sand is replaced by superfine sand, 10%, 20%, 30%, 40% and 50%. The percentages of basalt rock powder and superfine sand replace, in volume, the same quantity of Portland cement and artificial sand that forms portion of the mixture. The strength indexes such as flexural strength, compressive strength, ultrasonic pulse velocity and dynamic elastic modulus were investigated. Overall results show that despite the reduction of mechanical properties of cement mortar, BRP and SS can be used as partial replacement of Portland cement and artificial sand in account of ratios from 10% to 25% basalt rock powder quantity by Portland cement weight and 10% to 20% superfine sand amount by volume of artificial sand.

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Investigation of cement based composites made with recycled rubber aggregate

Hemijska industrija ◽

10.2298/hemind111203010j ◽

2012 ◽

Vol 66 (4) ◽

pp. 609-617 ◽

Cited By ~ 2

Author(s):

Dragica Jevtic ◽

Dimitrije Zakic ◽

Aleksandar Savic

Keyword(s):

Mechanical Properties ◽

Ultrasonic Pulse Velocity ◽

Ultrasonic Pulse ◽

Pulse Velocity ◽

Partial Replacement ◽

Experimental Investigations ◽

The Sustainable Development ◽

Freeze Thaw ◽

Hardened State ◽

Recycled Rubber

The results of experimental investigations performed on cement based composites made with addition of recycled rubber as a partial replacement of natural river aggregate are presented in this paper. Different properties of cement based mortar were analyzed, both in fresh and in hardened state. Tested properties in the fresh state included: density, consistency and volume of entrained air. In the hardened state, the following properties were tested: density, mechanical properties (compressive and flexural strength), modulus of elasticity, adhesion to concrete substrate, water absorption, freeze-thaw resistance and ultrasonic pulse velocity. The obtained results indicate that recycled rubber can be successfully applied as a partial replacement of natural river aggregate in cement based composites, in accordance with the sustainable development concept. The investigation showed that physical-mechanical properties of cementituous composites depend to a great extent on the percentage of replacement of natural river aggregate with recycled rubber, especially when the density, strength, adhesion and freeze-thaw resistance are concerned. The best results were obtained in the freeze-thaw resistance of such composites.

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