Incorporating industrial by-products into cement-free binders: Effects on water absorption, porosity, and chloride penetration

2021 ◽  
Vol 304 ◽  
pp. 124675
Author(s):  
May Huu Nguyen ◽  
Van Tuan Nguyen ◽  
Trong-Phuoc Huynh ◽  
Chao-Lung Hwang
Keyword(s):  
Water Absorption ◽  
Chloride Penetration ◽  
By Products

Comprehensive Characterization of Agricultural By-Products for Bio-Aggregate Based Concrete

2022 ◽  
Author(s):  
Herinjaka Haga Ratsimbazafy ◽  
Aurélie Laborel-Préneron ◽  
Camille Magniont ◽  
Philippe Evon
Keyword(s):  
Water Absorption ◽  
Building Materials ◽  
Complete Characterization ◽  
Water Soluble ◽  
Dry Density ◽  
Characterization Methods ◽  
Manufacturing Method ◽  
West Part ◽  
Hemp Shiv ◽  
By Products

The valorization of available agricultural by-products is important for the development of bio-aggregate based concretes as eco-friendly solutions for building materials. However, their diversity requires to assess their potential of use in vegetal concretes. This study aims to propose simple and relevant multi-physical characterization methods for plant aggregates. Basic and complementary characterizations were carried out on hemp shiv as a reference plant aggregate, and nine by-products available in the South-West part of France, i.e., oleaginous flax shiv, sunflower pith and bark, coriander straw, wheat straw, wheat chaff, corn shuck, miscanthus stem and vine shoot. The basic characterizations performed were those recommended by the TC-RILEM 236 BBM, i.e., particle size distribution, bulk density, water absorption and thermal conductivity. Complementary characterizations have also been proposed, taking into account the possible environment of the binder and the vegetal concrete manufacturing method. The additional tests developed or adapted from previous research assess the following properties: the content of water-soluble compounds at pH 7 and 12, the dry density of plant aggregates compacted in wet state, the real water absorption after compaction and the compression behavior of these compacted aggregates. This complete characterization highlights the distinct behavior of the different agroresources and allows to correlate these characteristics to the use properties of hardened composites.

Fresh, Durability and Mechanical Behavior of Self Consolidating Concrete Incorporating Fly Ash and Admixture under Hot Weather

2021 ◽  
Vol 904 ◽  
pp. 453-457
Author(s):  
Samer Al Martini ◽  
Reem Sabouni ◽  
Abdel Rahman Magdy El-Sheikh
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Weather Conditions ◽  
Chloride Penetration ◽  
The Self ◽  
Fresh Properties ◽  
Self Consolidating Concrete ◽  
Slump Flow ◽  
Hot Weather

The self-consolidating concrete (SCC) become the material of choice by concrete industry due to its superior properties. However, these properties need to be verified under hot weather conditions. The paper investigates the behavior of SCC under hot weather. Six SCC mixtures were prepared under high temperatures. The SCC mixtures incorporated polycarboxylate admixture at different dosages and prolonged mixed for up to 2 hours at 30 °C and 40 °C. The cement paste was replaced with 20% of fly ash (FA). The fresh properties were investigated using slump flow, T50, and VSI tests. The compressive strength was measured at 3, 7, and 28 days. The durability of SCC mixtures was evaluated by conducting rapid chloride penetration and water absorption tests.

Status of Site Test Methods of Organosilicon Hydrophobic Impregnants for Protecting Reinforced Concrete

2014 ◽  
Vol 638-640 ◽  
pp. 1676-1682
Author(s):  
Zong Yang Yuan ◽  
Hong Yao Sun ◽  
Zheng Yang ◽  
Ming Xia Shen ◽  
Guo Liang Shan
Keyword(s):  
Reinforced Concrete ◽  
Water Absorption ◽  
Test Methods ◽  
Chloride Penetration ◽  
Water Repellent ◽  
Repellent Property ◽  
Advantages And Disadvantages ◽  
The Status ◽  
Rebar Corrosion ◽  
Site Test

The organosilicon hydrophobic impregnants is applied on concrete to prevent rebar corrosion with its water repellent property which can prevent the intrusion of chloride and other harmful media. On-site the parameters of organosilicon hydrophobic impregnants of controlling quality consist of resistance to chloride penetration, water absorption of concrete and impregnating depth of organosilicon hydrophobic impregnants. The status of test methods of these parameters is summarized and their advantages and disadvantages are briefly reviewed. Finally some ideas are presented about shortcomings of test methods.

scholarly journals Effects of Adding Silica Fume and Empty Fruit Bunch to the Mix of Cement Brick

2021 ◽  
Vol 3 (1) ◽  
pp. 19-30
Author(s):  
Jen Ling ◽  
Yong Lim ◽  
Wen Leong ◽  
How Sia
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Silica Fume ◽  
Palm Oil ◽  
Absorption Capacity ◽  
Water Absorption Capacity ◽  
Empty Fruit Bunch ◽  
Absorption Properties ◽  
Proper Disposal ◽  
By Products

Silica fume (SF) and palm oil empty fruit bunch (EFB) are the by-products of the ferroalloy smelting industry and oil palm plantation, which require proper disposal to minimize the environmental impacts. To consume the by-products, the feasibility of utilizing SF and EFB to fabricate bricks was studied. Limited studies were adopting EFB as the natural fibres in bricks and its pro-portion barely exceeded 5%. With the enhancement of SF, EFB content in the mix could be increased. In this study, 336 specimens were produced in the cement-to-sand (c/s) ratios of 1:2.5 and 1:3, where SF replaced 10% to 15% cement in the mix by weight while EFB substituted 20% to 25% sand by volume. The specimens were tested for the compressive strength, density, and water absorption properties. SF was found to strengthen the mix, while EFB reduced the compressive strength and increased the water absorption capacity of the brick. Based on the evaluation results, the mix containing less than 10% SF and 20% EFB content was applicable for non-load-bearing brick.

scholarly journals Porosity Evaluation of Concrete Containing Supplementary Cementitious Materials for Durability Assessment through Volume of Permeable Voids and Water Immersion Conditions

Buildings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 378
Author(s):  
Manish Kewalramani ◽  
Ahmad Khartabil
Keyword(s):  
Water Absorption ◽  
Water Immersion ◽  
Cementitious Materials ◽  
Chloride Penetration ◽  
Supplementary Cementitious Materials ◽  
Partial Replacement ◽  
Testing Method ◽  
Durability Assessment ◽  
Astm C1202 ◽  
The Impact

Concrete containing supplementary cementitious materials (SCMs) as partial replacement of ordinary Portland cement is regarded as green and durable concrete, with several advantages such as improved strength gain mechanism, resistance to degradation and extended service life of structure. Water absorption or porosity of concrete is directly related to the durability of concrete. In this present study, five concrete mixes involving three different SCMs are investigated for water absorption and rapid chloride penetration rating. A comparison between porosity values obtained using four standard testing methods, i.e., BS 1881-122, RILEM CPC 11.1, RILEM CPC 11.3, and ASTM C642 are presented for three different concrete mixes containing varied compositions and proportions of two SCMs. The testing method by RILEM CPC 11.3 includes distinctive sample preparation and is regarded as a stringent method to represent the degree of concrete porosity. Two additional concrete mixes with three SCMs are further investigated for their water absorption and immersion following the testing method by RILEM CPC 11.3. The impact of SCMs on concrete porosity is discussed. A linear correlation between porosity and rapid chloride penetration (RCP) ratings obtained as per ASTM C1202-19 on specimens of all investigated concrete mixes is proposed as a rapid approach to assess chloride penetration of concrete specimens containing SCMs.

Transport properties of high-performance cementitious composites incorporating micro and nano SiO2 into the binder

2012 ◽  
Vol 19 (4) ◽  
pp. 415-421 ◽  
Author(s):  
Mostafa Jalal
Keyword(s):  
Water Absorption ◽  
Transport Properties ◽  
High Performance ◽  
Chloride Penetration ◽  
Binder Content ◽  
Cementitious Composites ◽  
Capillary Absorption ◽  
Nano Silica ◽  
Self Compacting Concrete ◽  
Concrete Properties

AbstractIn this paper, transport properties of high-performance self-compacting concrete (SCC), as one of the important cementitious composites incorporating micro and nano silica (NS) (SiO2) into the binder, have been investigated. For this purpose, different mixtures were designed with different amounts of silica fume (SF) and NS admixtures. Different binder contents were also investigated to observe the binder content effect on the concrete properties. Corrosion behavior was evaluated by chloride penetration and resistivity tests. Water absorption and capillary absorption were also measured as other durability related properties. The results showed that water absorption, capillary absorption, and Cl ion percentage decreased rather significantly in the mixtures containing admixtures especially the blend of SF and NS. By addition of the admixtures, resistivity of the SCC mixtures increased, which can lead to reduction of corrosion probability.

Analyses of the Protective Effect of Polyethylene-Triethoxysilane and Triethoxysilane Emulsion Coatings on Concrete Substrate

2014 ◽  
Vol 936 ◽  
pp. 1531-1538 ◽  
Author(s):  
Xin Yuan Zhang ◽  
Shao Chun Li ◽  
Tie Jun Zhao ◽  
Zu Quan Jin
Keyword(s):  
Carbon Dioxide ◽  
Protective Effect ◽  
Water Absorption ◽  
Chloride Ions ◽  
Chloride Penetration ◽  
Reinforced Concrete Structures ◽  
Absorption Test ◽  
Chloride Resistance ◽  
Water Absorption Test ◽  
The Stability

Water could transport aggressive substances such as carbon-dioxide, sulfates and chloride ions in reinforced concrete structures. By penetration, the stability of the whole structure is influenced. This paper deals about waterproof effect and chloride resistance of two kinds of silane coatings, polyethylene-triethoxysilane and triethoxysilane emulsions on concrete substrate along with the mechanism of the hydrophobic action. The results, in terms of visual observations, chloride test and water absorption test, showed that the two silane coatings could reduce the chloride penetration and the water absorption efficiently. The comparison between the two indicates that polyethylene-triethoxysilane penetrates little when applied on the substrate, but it performs better waterproof effect and is more efficient to chloride penetration.

scholarly journals Mechanical Characteristics and Water Absorption Properties of Blast-Furnace Slag Concretes with Fly Ashes or Microsilica Additions

2019 ◽  
Vol 9 (7) ◽  
pp. 1279 ◽  
Author(s):  
Dora Foti ◽  
Michela Lerna ◽  
Maria Sabbà ◽  
Vitantonio Vacca
Keyword(s):  
Blast Furnace ◽  
Water Absorption ◽  
Blast Furnace Slag ◽  
Experimental Tests ◽  
Absorption Capacity ◽  
Recycled Aggregates ◽  
Environmental Damage ◽  
Fly Ashes ◽  
Furnace Slag ◽  
By Products

The paper shows the results of an experimental tests campaign carried out on concretes with recycled aggregates added in substitution of sand. Sand, in fact, has been totally replaced once by blast-furnace slag and fly ashes, once by blast-furnace slag and microsilica. The aim is both to utilize industrial by-products and to reduce the use of artificial aggregates, which impose the opening of pits with high environmental damage. The results show that in the concretes so made the water absorption capacity has reduced and durability has improved. The test campaign and the results described in the present article are certainly useful and can be especially utilized for research on a larger scale in this field.

scholarly journals Influence of formwork liners on fresh, mechanical and durability properties of cast concretes

2021 ◽  
Author(s):  
Sunny R Gurbani
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Surface Characteristics ◽  
Concrete Surface ◽  
Chloride Penetration ◽  
Freeze Thaw ◽  
Durability Properties ◽  
Salt Scaling ◽  
Chloride Penetration Resistance ◽  
Scaling Resistance

The following study investigates the influence of formwork liners on fresh, mechanical and durability properties of cast concretes. In order to investigate the influence of formwork liners (Weather Shield, Poligloss and Zemdrain) manufactured by Newark Group on concrete properties, column and other specimens were cast in conventional moulds (steel, wood and plastic) with and without formwork liners. As per ASTM Standards Surface characteristics, compressive strength, water absorption, sorptivity, chloride penetration, freeze thaw and salt scaling tests were conducted and results are analyzed. It is found that by the application of formwork liners Zemdrain and Weather Shield, compressive strength, water absorption, sorptivity, chloride penetration resistance, freeze thaw resistance and salt scaling resistance were improved. By the application of Poligloss, concrete surface was found to be homogenous without any visible blow-holes.

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