scholarly journals EFFECT OF WATER ABSORPTION PROPERTY OF COARSE AGGREGATE ON DRYING SHRINKAGE OF CONCRETE

2021 ◽  
Vol 74 (1) ◽  
pp. 178-184
Author(s):  
Toshinari HAYASHI ◽  
Atsushi SAITO ◽  
Shinichi MIYAZATO
Keyword(s):  
Water Absorption ◽  
Coarse Aggregate ◽  
Drying Shrinkage ◽  
Absorption Property ◽  
Effect Of Water ◽  
Water Absorption Property

Plasma Activated Acrylamide Initiated Polymerization of Acrylamide

2011 ◽  
Vol 391-392 ◽  
pp. 1168-1172
Author(s):  
Xiao Chun Fang ◽  
Sheng Gao Wang ◽  
Ming Yang Wang ◽  
Kai Wei Xu
Keyword(s):  
Molecular Weight ◽  
Water Absorption ◽  
Plasma Discharge ◽  
Polymerization Temperature ◽  
Absorption Property ◽  
Discharge Time ◽  
Water As Solvent ◽  
Water Absorption Property

A study was made on plasma-initiated polymerization of polyacrylamide (PAM) with high superabsorbent property. The viscosity-averaged molecular weight Mη of this PAM was 6.2×106g/mol in the measurement of viscosity by using water as solvent. Its conversion and water absorption calculated are 70% and 300g/g respectively. The effects of plasma discharge time, polymerization temperature and duration on the conversion and the molecular weight of the products were also investigated. The results of this study suggested that the method of plasma initiated polymerization could greatly enhance the molecular weight and water absorption property of the polymer.

Experimental Study on Manufacturing Environmental Protection Baking Free Brick of Waste Concrete

2014 ◽  
Vol 584-586 ◽  
pp. 1188-1191
Author(s):  
Peng Fei Li ◽  
Xian Chun Zheng ◽  
Ling Feng Ji
Keyword(s):  
Experimental Study ◽  
Water Absorption ◽  
Environmental Protection ◽  
Absorption Property ◽  
Paper Test ◽  
Waste Concrete ◽  
Maintenance Time ◽  
The Matrix ◽  
Water Absorption Property ◽  
Material Studies

This paper test the strength intensity,water absorption property of 10 baking—free bricks using the matrix cementing component in waster concrete as the material,studies the effect of m~ing ratio and maintenance time on pmpe~y to get the best mKing ratio of this kind of brick.It also analyzes the intension resources of this brick.

scholarly journals Effects of Two Pre-Treatment Methods on Water Absorption Property of Polyester-Fibre Composites

2020 ◽  
Vol 5 (12) ◽  
pp. 92-95
Author(s):  
Pauline N. Obianuko ◽  
Tessy U. Onuegbu
Keyword(s):  
Water Absorption ◽  
Unsaturated Polyester ◽  
Polyester Fibre ◽  
Treatment Method ◽  
Fibre Volume ◽  
Absorption Property ◽  
Treatment Methods ◽  
Fibre Composites ◽  
Pre Treatment ◽  
Water Absorption Property

The use of plant fibres as reinforcement in composite materials is finding increasing interest in the automotive and building industry, and the properties of plant fibre composites have been addressed in numerous research studies. The replacement of synthetic fibres with natural fibres in composites is based on their renewable and environmentally friendly nature. The aim of this work is to investigate the effects of two chemical pre-treatment methods on the water absorption property of polyester-fibre composites. Fully grown kenaf (hibiscus cannabalis) bast fibres were manually retted from the stalk, washed, and cut into short fibre lengths of about 10 cm. One portion of the fibres was pre-treated with 5% pbw NaOH solution before immersing it in glacial acetic acid and then in acetic anhydride. The second portion was pre-treated with 5%pbw of NaOH and 0.125% of KMnO4 in acetone. The third portion of fibres was untreated to serve as control. The ground fibre was incorporated into ortho unsaturated polyester and cast with Teflon square shaped mould. The cured samples were weighed and immersed in water at room temperature until no further gain in weight was observed. The SEM of the fibres and the composites was taken. The results showed that the acetylation pre-treatment method reduced the water absorption property of the composites by a minimum of 46.0% across all fibre volume fractions while the permanganate pre-treatment reduced it by at least 25.5%. Chemical pre-treatment of fibres can therefore

Experimental Study on Drying Shrinkage Performance of Solid Concrete Bricks Made from Recycled Coarse Aggregate

2013 ◽  
Vol 753-755 ◽  
pp. 762-770 ◽  
Author(s):  
Xi Xi He ◽  
Tao Zhang
Keyword(s):  
Moisture Content ◽  
Water Absorption ◽  
Coarse Aggregate ◽  
Drying Shrinkage ◽  
Recycled Aggregate ◽  
Test Results ◽  
Replacement Rate ◽  
Recycled Coarse Aggregate ◽  
The Impact ◽  
The Relationship

Solid recycled coarse aggregate concrete bricks were produced by QTY4-40 brick machine with strength grades of MU15-MU30. Recycled aggregate replacement rate was up to 100%. Water absorption and moisture content were tested. Two methods were taken to test the drying shrinkage. The impact of recycled aggregate replacement rate and curing period on the drying shrinkage rate, water absorption, moisture content, density was analyzed, and the relationship between them was presented. The results indicate that recycled aggregate can increase the shrinkage of solid concrete brick. The shrinkage of recycled solid concrete bricks' (fully substitute) is larger than ordinary concrete bricks' by 1.6-2 times. Water reducer is helpful to improve the water retention and decrease the shrinkage of brick. One of the test results of shrinkage got by the methods recommended in relevant specification is smaller.

Experimental Study on Drying Shrinkage and Water Absorption Rate of Recycled Concrete Hollow Block

2011 ◽  
Vol 250-253 ◽  
pp. 1058-1061
Author(s):  
Zhi Xing Zeng ◽  
Li Xing Su
Keyword(s):  
Water Absorption ◽  
Absorption Rate ◽  
Coarse Aggregate ◽  
Drying Shrinkage ◽  
Maximum Dosage ◽  
Recycled Concrete ◽  
Primary Study ◽  
Recycled Coarse Aggregate ◽  
Water Absorption Rate ◽  
Hollow Block

On the premise of using the five dosage levels of recycled coarse aggregate, the paper primary study on the drying shrinkage and water absorption rate of recycled concrete hollow block in order to determine the maximum dosage of recycled coarse aggregate, then find out the relationship between the drying shrinkage and the water absorption rate of recycled concrete hollow block. The results showed that: the maximum dosage of recycled coarse aggregate can reach 100%; there is a quadratic relationship between the drying shrinkage and the water absorption rate of the block.

scholarly journals Properties of Cement Brick with Partial Replacement of Sand and Cement with Oil Palm Empty Fruit Bunches and Silica Fume

2019 ◽  
Vol 5 (3) ◽  
pp. 289 ◽  
Author(s):  
Jen Hua Ling ◽  
Yong Tat Lim ◽  
Wen Kam Leong ◽  
Euniza Jusli ◽  
How Teck Sia
Keyword(s):  
Water Absorption ◽  
Construction Industry ◽  
Silica Fume ◽  
Oil Palm ◽  
Partial Replacement ◽  
Absorption Property ◽  
Empty Fruit Bunches ◽  
Negative Implication ◽  
Water Absorption Property ◽  
By Products

Oil palm empty fruit bunches (EFB) and silica fume (SF) are the by-products of the oil palm plantation and the ferroalloy smelting industries, respectively. Improper disposal of these materials leads to negative implication to the environment. This study was carried out to investigate the potential application of EFB and SF in cement bricks. EFB fibre and SF replaced up to 25% of sand and cement in the mix, respectively, in several groups of specimens that distinguished the normal, EFB-, SF- and EFB-SF-cement bricks. The specimens were tested for the compressive strength, density and water absorption property. The results reveal that SF, at an optimum amount of 10% cement replacement, increased 10% of the strength of the cement brick. EFB fibre reduced the strength and density but increased water absorption property of the cement brick. For application in the construction industry, SF and EFB fibre contents should be kept within 10% and 20% respectively.

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