Durability of Concrete for Thermal Insulation Composite Wall

2013 ◽  
Vol 438-439 ◽  
pp. 314-317
Author(s):  
Feng Lan Li ◽  
Hai Na Chen ◽  
Xue Zhen Feng ◽  
Su Yang
Keyword(s):  
Thermal Insulation ◽  
Coarse Aggregate ◽  
Cement Mortar ◽  
Chloride Penetration ◽  
Fine Aggregate ◽  
Volume Percent ◽  
Water Penetration ◽  
Aggregate Concrete ◽  
Ordinary Concrete ◽  
Composite Wall

Tests were carried out to study the durability of fine aggregate concrete and composite concrete simultaneously provided by the wet-sieving technique for the thermal insulation composite wall as building envelops. The workability of every concrete satisfied the basic requirement of cast quality. The composition analyses of concrete showed that compared with the ordinary concrete, the volume percent of coarse aggregate was increased and the volume percent of cement mortar was decreased due to that the residual coarse aggregate stayed on the sieve was blended with ordinary concrete, which increased the resistances of composite concrete to chloride penetration, water penetration and carbonization. Meanwhile, the resistances of fine aggregate concrete to chloride penetration, water penetration and carbonization were reduced due to the obvious increase of the volume percent of cement mortar.

Experiment of Carbonization for Wet-Sieving Fine Aggregate Concrete Made from Ordinary Concrete

2011 ◽  
Vol 201-203 ◽  
pp. 2887-2890
Author(s):  
Shun Bo Zhao ◽  
Na Liang ◽  
Xiao Lu Ma ◽  
Su Yang
Keyword(s):  
Grain Size ◽  
Coarse Aggregate ◽  
Cement Content ◽  
Standard Test ◽  
Test Method ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Ordinary Concrete ◽  
Composite Wall ◽  
Wet Sieving

The research in this paper is part of wet-sieving concrete technique for building thermal insulated reinforced concrete composite wall. The carbonized depths of fine aggregate concrete and ordinary concrete were measured by the carbonization test method. Based on the test, in standard test environmental conditions, the carbonization changes of fine aggregate concrete rely on its inherent combination changes. The lower carbonized depth takes place in fine aggregate concrete comparing with ordinary concrete, which is resulted from the increasing cement content and the reduction of grain size of coarse aggregate in fine aggregate concrete. Finally, the carbonization of fine aggregate concrete is evaluated according to the relative specification, and the reasonable service life of fine aggregate concrete is precast.

Experimental Study on Mechanical Properties of Fine Aggregate Concrete Made after Wet-Sieving Coarse Aggregate

2010 ◽  
Vol 168-170 ◽  
pp. 2200-2203 ◽  
Author(s):  
Shun Bo Zhao ◽  
Na Liang ◽  
Li Xin Liu ◽  
Li Sun ◽  
Su Yang
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Coarse Aggregate ◽  
Fine Aggregate ◽  
Concrete Wall ◽  
Aggregate Concrete ◽  
Structural Wall ◽  
Ordinary Concrete ◽  
Reinforced Composite ◽  
Wet Sieving

The validity of the wet-sieving concrete technique for building the reinforced composite concrete wall are demonstrated in the paper. The fine aggregate concrete made by ordinary concrete passing the sieve with square mash of 15 mm was cast for the surface layer, the recomposed concrete mixed by the residual concrete stayed on the sieve with the ordinary concrete was cast for the reinforced concrete structural wall. The mechanical properties such as the cubic and compressive strengths, the elastic modulus and the splitting and flexural tensile strengths of the fine aggregate concrete, the recomposed concrete and the ordinary concrete were tested and analyzed. The results show that the elastic modulus and splitting tensile strength of fine aggregate concrete reduce in some extent compared with that of ordinary concrete, the mechanical properties of recomposed concrete are almost the same as that of ordinary concrete.

Influence of Quality and Replacement Rate of Recycled Coarse Aggregate on the Frost Resistance of Recycled Concrete

2017 ◽  
Vol 898 ◽  
pp. 2046-2049 ◽  
Author(s):  
Gong Bing Yue ◽  
Qiu Yi Li ◽  
Jian Lin Luo ◽  
Yuan Xin Guo
Keyword(s):  
Frost Resistance ◽  
Coarse Aggregate ◽  
Mass Loss Rate ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Fine Aggregate ◽  
Freezing And Thawing ◽  
Aggregate Concrete ◽  
Ordinary Concrete ◽  
Recycled Coarse Aggregate

Compared with natural aggregate, the content of hardening cement in recycled aggregate is larger, which leads that the water absorption of recycled aggregate is larger and its performance such as robustness is poorer. And the engineering field pays much attention to the problem of the recycled fine aggregate which can be used in the durability requirements of recycled concrete or not. Using the method of fast freezing and thawing the influence of quality and replacement ratio of recycled coarse aggregate on the frost resistance of recycled concrete was researched basing on ordinary concrete frost resistance performance. The results showed that, in terms of the frost resistance capacity, the order is in: ordinary concrete>high-quality recycled coarse aggregate concrete>normal quality recycled coarse aggregate concrete. After 250 freeze-thaw cycles, the mass loss rate of general quality recycled coarse aggregate concrete is 5%, relative dynamic elastic modulus is 60% when replace rate was 100%.

Experimental Study on Shrinkage of Wet-Sieving Fine Aggregate Concrete Made from Ordinary Concrete

2011 ◽  
Vol 197-198 ◽  
pp. 915-918
Author(s):  
Shun Bo Zhao ◽  
Shan Zhao ◽  
Su Yang ◽  
Xiao Lu Ma ◽  
Li Sun
Keyword(s):  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
Fine Aggregate ◽  
Test Results ◽  
Casting Surface ◽  
Aggregate Concrete ◽  
Ordinary Concrete ◽  
Concrete Layer ◽  
Composite Wall ◽  
Wet Sieving

The research is part of wet-sieving concrete technique for building thermal insulated reinforced concrete composite wall. The fine aggregate concrete is made from ordinary concrete passing sieve with square mash of 15 mm for casting surface concrete layer of the wall. Tests were conducted to determine drying shrinkage and autogenous shrinkage of fine aggregate concrete and ordinary concrete. On the basis of test results, the variations of these shrinkages are analyzed. It shows that the shrinkage is almost resulted from drying shrinkage; the drying shrinkages of fine aggregate concrete and ordinary concrete increase rapidly in the early ages before 14 d, the former takes place with large value 1.61 times of the later; the increments of drying shrinkage of fine aggregate concrete and ordinary concrete are almost the same after 14 d. The drying shrinkage of fine aggregate concrete is about 1.23 times of ordinary concrete. The formulas are proposed for calculating the drying shrinkage of fine aggregate concrete and ordinary concrete.

Effect of some Key Factors on the Strength of Recycled Concrete

2012 ◽  
Vol 503-504 ◽  
pp. 576-581
Author(s):  
Xue Bing Zhang ◽  
Zhi Fang
Keyword(s):  
Coarse Aggregate ◽  
Cement Mortar ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Key Factors ◽  
Ordinary Concrete ◽  
Concrete Mix ◽  
Rate Maximum ◽  
Cement Strength ◽  
Granule Diameter

Because there exists a used cement mortar layer outside the recycled aggregate, there are more interfaces inside recycled concrete, which would result in recycled concrete has different properties from ordinary concrete. In this paper, the effect of such key factors for recycled concrete mix ratio as water-cement ratio, cement strength, sand rate, maximum granule diameter and gradation on the properties of concrete with recycled coarse aggregate was studied by experiment, and the some useful suggestion for mix ratio of recycled concrete was provided.

scholarly journals Development of Ultra High Strength Concrete Using Silica Fume and its Mechanical & Durability Properties - Experimental Investigation

2021 ◽  
Author(s):  
Sathyakumar N ◽  
Arun M ◽  
Arunachalam N
Keyword(s):  
Experimental Investigation ◽  
Flexural Strength ◽  
Silica Fume ◽  
High Strength Concrete ◽  
Coarse Aggregate ◽  
High Strength ◽  
Chloride Penetration ◽  
Fine Aggregate ◽  
Strength Concrete ◽  
Super Plasticizer

Abstract This experimental investigation is aimed to develop an ultra-high strength concrete with minimum of 100 MPa as compressive strength.In order to obtain this, twenty different concrete mixes have been tried, using cement, river sand, coarse aggregate, water, silica fume and super plasticizer. During the preparation of trial mixes of concrete, the water / binder ratio of 0.2, silica fume of 10% to the weight of cement, super plasticizer of 10 litres per cubic metre of concrete and coarse aggregate of 1000 kg/m3 were kept as constant. The amount of cement content (as 600-, 650-, 700-, 750- and 800 kg/m3) and the fine aggregate content (as 500-, 600-, 700- and 800 kg/m3) was varied. Totally 300 specimens were cast and tested in this investigation.The100 x 100 x 100 mm size of cubes, 150 x 300 mm size of cylinders, 100 x 100 x 500 mm size of prisms, 100 x 200 mm size of cylinders, 60 x 100 mm size of cylinders were used to test compressive, split tensile, flexural strength, chloride penetration and water penetration tests respectively at the age of 7-, 14- and 28 days. Based on the test results, a suitable mix proportion to produce an ultra-high strength concrete has been identified. Subsequently, from this investigation, the maximum cube compressive strength of 130 MPa, split tensile strength of 6.94 MPa, flexural strength of 21.39 MPa, chloride penetration 36 Coulombs which is lesser than 100 and sorptivity coefficient valueof 0.582 has been achieved.

Vehicle Trajectory Test on Interlocking Pavement Made From No Fine Agregate Concrete

2021 ◽  
Vol 27 (1) ◽  
pp. 143-150
Author(s):  
Adityo Budi Utomo ◽  
Bhima Dhanardono ◽  
Laely Fitria Hidayatiningrum
Keyword(s):  
Water Absorption ◽  
Coarse Aggregate ◽  
Pavement Performance ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Drainage Layer ◽  
Wheel Loader ◽  
Cement Ratio ◽  
Drainage Capacity ◽  
Vehicle Trajectory

In rainy season, many cases of roads being submerged in water because of a lack of drainage capacity and low water absorption by the subgrade. This study makes no fine aggregate concrete as an interlocking pavement to increase water absorption to the drainage layer and subgrade. No fine aggregate concrete is made from mix of cement : coarse aggregate = 1 : 6 with water cement ratio 0,4. The results showed the value of specific gravity, water absorption, compressive strength, and Na2SO4 resistance are 1,703 gr/cm3, 2.57%, 10.8 MPa, and 0.79%. To see the level of interlocking pavement performance, no fine aggregate concrete  is arranged above the drainage layer and the levelling layer, and then a trajectory and inundation test is performed. The result of inundation and trajectory tests shows that interlocking pavement can pass water to subgrade without inundation and can withstand the wheel loader that is equivalent to 13,000 kg so that it can be used for sidewalks, park lanes, and pavement with a maximum axle load of 8 tons.

Technique Development of Recycling and Utilizing Waste Concrete as Building Material

2012 ◽  
Vol 174-177 ◽  
pp. 275-279
Author(s):  
Da Xing Qian ◽  
Ying Wei Yun ◽  
Il Young Jang ◽  
Woo Young Park
Keyword(s):  
Building Material ◽  
Coarse Aggregate ◽  
Recycled Concrete ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate ◽  
Recycled Fine Aggregate ◽  
Waste Concrete ◽  
Technique Development ◽  
Recycled Material

In this paper shucking technique is developed to improve the performance of recycled coarse aggregate concrete. Comparison test has been done to demonstrate the good performance of shucking recycled coarse aggregate concrete than that of common recycled concrete. Simultaneously recycled fine aggregate concrete and recycled finely grinded admixture are extracted and studied too. Results show that this new technique can not only improve the performance of recycled material and enlarge recycled material type, but also make waste concrete to be reused completely.

Impermeability of Wet-Sieving Fine Aggregate Concrete Made from Ordinary Concrete

2011 ◽  
Vol 201-203 ◽  
pp. 2883-2886
Author(s):  
Xiao Ke Li ◽  
Shan Zhao ◽  
Li Sun ◽  
Shun Bo Zhao
Keyword(s):  
Reinforced Concrete ◽  
Chloride Ion ◽  
Fine Aggregate ◽  
Ion Diffusion ◽  
Aggregate Concrete ◽  
Structural Wall ◽  
Water Permeation ◽  
Ordinary Concrete ◽  
Concrete Layer ◽  
Wet Sieving

The research is part of wet-sieving concrete technique for building thermal insulated reinforced concrete composite wall. The fine aggregate concrete is made from ordinary concrete passing sieve with square mash of 15 mm for casting surface concrete layer of the wall, the recomposed concrete is made of residual concrete stayed on sieve and ordinary concrete for casting reinforced concrete structural wall. The impermeability of fine aggregate concrete and recomposed concrete are measured by water permeation method and chloride-ion permeation method, the relative permeability and chloride-ion diffusion coefficients of concrete are determined. Based on the test, the effects of the changes of aggregate series, sand ratio and cement paste on the impermeability of concrete are analyzed.

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