Effect of Chloride Ion Content and Replacement Ratio of Manufactured Sand on Performance of Sea Sand Masonry Mortar

2021 ◽  
Author(s):  
Siyu Yang ◽  
Zhenping Sun ◽  
Zhengwu Jiang ◽  
Zhenghong Yang ◽  
Sifeng Liu
Keyword(s):  
Chloride Ion ◽  
Ion Content ◽  
Replacement Ratio ◽  
Manufactured Sand ◽  
Sea Sand ◽  
Masonry Mortar

Study on the Threshold Value and Test Methods for Chloride Ion Content in Sea Sand

2016 ◽  
Vol 680 ◽  
pp. 482-485
Author(s):  
Fei Long Sun ◽  
Shuai Wu ◽  
Quan Jiang ◽  
Ting Ting Liu
Keyword(s):  
Early Stage ◽  
Chloride Ion ◽  
Threshold Value ◽  
Test Methods ◽  
Chloride Ions ◽  
International Standards ◽  
National Standards ◽  
Ion Content ◽  
River Sand ◽  
Sea Sand

The building sand is mainly composed of river sand at early stage. Recently, with the depletion of river sand, the new mined river sand cannot meet the demands for building sand. The sea sand is resourceful and can remedy the deficiency of sand for construction. However, the sea sand contains high content of chlorine salt, shell and lightweight matters. They are harmful for the strength and durability of concrete and will lead to premature corrosion of rebar. This will endanger the safety of construction. The studies demonstrate that high content of chlorine salt in sea sand is the main factor led to the deterioration of sea sand concrete. Therefore, in order to ensure the safety of construction, the threshold value of chloride content is specified in standards about concrete and aggregate. And methods testing the content of chloride ions are provided. However, the criterion in different standards differs from one another, which means their different viewpoints about the harm of chloride ions. In this work, the threshold value and test methods of chloride ion content for the building sand in the national standards and the international standards are summarized. The research has great significant for setting standards about sea sand, determining the rational threshold value of chloride ion content and improving the method testing the content of chloride ions.

Study on the Properties of Sea Sand Concrete with Fly Ash

2014 ◽  
Vol 1065-1069 ◽  
pp. 1854-1857 ◽  
Author(s):  
Yi Jiang ◽  
Jun Zhe Liu ◽  
Wu Sun ◽  
Chao Yi Zheng ◽  
Si Yun Wu
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Chloride Ion ◽  
Main Issue ◽  
Microscopic Structure ◽  
Hydration Products ◽  
Ion Content ◽  
Sea Sand ◽  
Early Strength ◽  
Chlorine Ion

The harmful chloride ion in sea sand concrete is the main issue that hinders its application, proposing a method using fly ash the active mineral, chloride ion content of harmful curing of sea sand concrete, to improve the durability of sea sand concrete. The experiment studies the influence of sand in the chlorine ion and fly ash on the strength of concrete, and analyzes microscopic structure and hydration products of concrete. Research results show that: the sea sand concrete with 20% fly ash prepared has good mechanical properties and durability; the existence of Cl- on the early strength of sea sand concrete has a positive promoting role, but has negative effective on the later development.

Fracture behaviors of HVFA-SCC mixed with seawater and sea-sand under three-point bending

2022 ◽  
pp. 136943322110273
Author(s):  
Lingzhu Zhou ◽  
Yu Zheng ◽  
Linsheng Huo ◽  
Yuxiao Ye ◽  
Xiaolu Wang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Fly Ash ◽  
Unstable Fracture ◽  
Replacement Ratio ◽  
Three Point Bending ◽  
Model Code ◽  
Softening Curve ◽  
Sea Sand ◽  
Fracture Behaviors ◽  
Tensile Softening

This paper aims to study the fracture behaviors of high-volume fly ash-self-compacting concrete (HVFA-SCC) mixed with seawater and sea-sand (SWSS) or freshwater and river sand (FWRS). Three-point bending test were performed on 24 notched beams fabricated with varying in replacement ratio of fly ash (0%, 30%, 50%, and 70%) and the type of water and sand (SWSS and FWRS). The initial and unstable fracture toughness of these test specimens are determined by the double- K fracture model. The effect of fly ash replacement ratio and type of water and sand on the fracture parameters is analyzed and discussed. In addition, the cohesive fracture toughness of all the test specimens is calculated by using Gauss–Chebyshev integral method and the weight function method based on the bilinear tensile softening curve given in CEP-FIP Model Code. A comparison of fracture toughness parameters of determined from the experimental approach and analytical approaches is presented in these SCC specimens. Results show that SCC mixed with SWSS replacing FWRS can improve the unstable fracture toughness and fracture energy, and decrease its brittleness behavior. The cohesive fracture toughness of SWSS-SCC specimens is underestimated by these analytical methods based on the tensile softening curve given in CEP-FIP Model Code.

Research on FRP-Reinforced Concrete Exposure Test

2011 ◽  
Vol 250-253 ◽  
pp. 1177-1182 ◽  
Author(s):  
Ye Fan Chen ◽  
Chao He Chen ◽  
Hong Wang ◽  
Chuan Min Zhang
Keyword(s):  
Reinforced Concrete ◽  
Marine Environment ◽  
Chloride Ion ◽  
Ultimate Capacity ◽  
Endurance Test ◽  
Ion Content ◽  
Exposure Test ◽  
The Real ◽  
Different Depths ◽  
Selected Location

The paper makes an analysis of the selected location and feasibility of the exposure test ground in the real marine environment, and the endurance test of the FRP- reinforced concrete built-up beam has been carried out on the exposure test ground. After 6 month and 12 month’s exposure test, the beams' mechanic performance and the chloride ion content in different depths have been determined. The results show that after the exposure test, the beams' ultimate capacity has been greatly decreased to a certain extent, and the FRP board can effectively prevent chloride from penetrating.

scholarly journals Compressive Strength, Chloride Ion Penetrability, and Carbonation Characteristic of Concrete with Mixed Slag Aggregate

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 940
Author(s):  
Se-Jin Choi ◽  
Young-Uk Kim ◽  
Tae-Gue Oh ◽  
Bong-Suk Cho
Keyword(s):  
Compressive Strength ◽  
Steel Slag ◽  
Chloride Ion ◽  
Fine Aggregate ◽  
Test Results ◽  
Replacement Ratio ◽  
Concrete Aggregates ◽  
The Social ◽  
Ferronickel Slag ◽  
Natural Aggregates

The shortage of natural aggregates has recently emerged as a serious problem owing to the tremendous growth of the concrete industry. Consequently, the social interest in identifying aggregate materials as alternatives to natural aggregates has increased. In South Korea’s growing steel industry, a large amount of steel slag is generated and discarded every year, thereby causing environmental pollution. In previous studies, steel slag, such as blast furnace slag (BFS), has been used as substitutes for concrete aggregates; however, few studies have been conducted on concrete containing both BFS and Ferronickel slag (FNS) as the fine aggregate. In this study, the compressive strength, chloride ion penetrability, and carbonation characteristic of concrete with both FNS and BFS were investigated. The mixed slag fine aggregate (MSFA) was used to replace 0, 25%, 50%, 75%, and 100% of the natural fine aggregate volume. From the test results, the highest compressive strength after 56 days was observed for the B/F100 sample. The 56 days chloride ion penetrability of the B/F75, and B/F100 samples with the MSFA contents of 75% and 100% were low level, approximately 34%, and 54% lower than that of the plain sample, respectively. In addition, the carbonation depth of the samples decreased with the increase in replacement ratio of MSFA.

Analyse the Difference of the Performance between Masonry Mortar Mixed with Manufactured Sand and Natural Sand

2013 ◽  
Vol 368-370 ◽  
pp. 1039-1042
Author(s):  
Cheng Xian Cen ◽  
Cheng Han Cen ◽  
Jing Qi Bai
Keyword(s):  
Experimental Study ◽  
Water Retention ◽  
Engineering Practice ◽  
Natural Sand ◽  
Manufactured Sand ◽  
The Difference ◽  
The One ◽  
Masonry Mortar

With the development of various infrastructure construction, the demand of sand is increasing. The supply of natural sand could not meet the requirements of engineering due to the excessive exploitation and using the Manufactured sand which instead of natural sand is one of the effective methods to resolve the shortage of natural sand. Based on the experimental study of mechanism of used sand and natural sand masonry mortar in water retention, density and consistence, this paper analyzed the difference between the masonry mortar mixed manufactured sand and the one mixed by Natural sand. The result of study can provide the reference in engineering practice which use the masonry mortar mixed manufactured sand not but mixed by Natural sand.

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