scholarly journals Quality control of lightweight aggregate concrete based on initial and final water absorption tests

2017 ◽  
Vol 210 ◽  
pp. 012022 ◽  
Author(s):  
M. Maghfouri ◽  
P. Shafigh ◽  
Z. Binti Ibrahim ◽  
V. Alimohammadi
Keyword(s):  
Quality Control ◽  
Water Absorption ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete

Surface Modification for Porous Artificial Lightweight Aggregate and Mechanical Properties of the Resulting Concrete

2011 ◽  
Vol 117-119 ◽  
pp. 1302-1305
Author(s):  
Ning Liao ◽  
Hong Zhi Cui
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Water Absorption ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
High Water ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
High Water Absorption ◽  
Change Material

This research is one part of preliminary work for integrated structural-functional energy storage concrete by using porous artificial lightweight aggregate and phase change material. Lightweight aggregate concrete (LWAC) has been applied more and more extensively in recent years, but high water absorption of porous artificial lightweight aggregate (LWA) is inconvenient for LWAC production. In order to improve LWA application, in this paper, two aspects of lightweight aggregate (LWA) study have been carried out, namely, a) LWA surface modification. The effects of different concentration of surface modifier on water absorption of modified LWA were studied. b) Mechanical properties of lightweight aggregate concrete made of the unmodified and modified LWAs Through comparing the water absorption of unmodified and modified LWAs, it can be known that the surface modification for LWA can reduce the water absorption obviously. The three kinds of lightweight concrete possess nearly same strength at 7-day and, at 28-day, the strength of LWAC using 1:20 modified LWA is highest and that of LWAC using 1:5 modified LWA is lowest. 28 days compressive strength of LWAC using 1:20 modified LWA could be up to 46.1MPa.

An Experimental Research on Basic Properties of Ceramsite Cellular Concrete

2017 ◽  
Vol 1142 ◽  
pp. 329-333 ◽  
Author(s):  
Yan Gang Zhang ◽  
Yun Xing Shi ◽  
Jing Bin Shi ◽  
Qing Xuan Wang ◽  
Kun Ni ◽  
...  
Keyword(s):  
Quality Control ◽  
Compressive Strength ◽  
Lightweight Aggregate ◽  
National Standards ◽  
Lightweight Aggregate Concrete ◽  
Masonry Structures ◽  
Aggregate Concrete ◽  
Mix Proportion ◽  
Selection Of ◽  
Cellular Concrete

Ceramsite cellular concrete (CCC for short) is a kind of lightweight aggregate concrete. In this paper, the selection of materials and design of mix proportion have been discussed, and basic property tests has been done. The compressive strength was proved up to the National Standards of P. R. GB50003-2001(code for design of masonry structures), furthermore, elastic modulus and Poisson's ratio were also introduced. Questions remain regarding the quality control of the product, and further work is needed to resolve this contradiction.

Test Machinery System of the Pressure Water Absorption Inside the Lightweight Aggregate Concrete

2013 ◽  
Vol 671-674 ◽  
pp. 1950-1953
Author(s):  
Gui Ling Wang ◽  
Ming Lei Ma ◽  
Dong Mei Miao ◽  
Hong Juan Ma
Keyword(s):  
Water Absorption ◽  
Construction Material ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Light Weight ◽  
Dead Load ◽  
Aggregate Concrete ◽  
Accuracy Test ◽  
Pressure Water ◽  
Machinery System

Concrete is a composite construction material composed primarily of aggregate, cement, and water. While different formulations provided varied properties. Some times engineering structure need to expand its span length, the commonly thinking is how to decrease the dead load by no harming the structure capacity. The lightweight aggregate concrete focus on the light weight of the aggregate and it can be obtained by using nature stone or artificial stones. The application can decrease the weight by lowering the structure body with 20%-30% total weight. This article proposed an accuracy test machinery system for the lightweight aggregate concrete to determine the water absorption behavior while in pumping pressure.

scholarly journals Effect of Aggregate Roughness on Strength and Permeation Characteristics of Lightweight Aggregate Concrete

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Ameer A. Hilal
Keyword(s):  
Surface Roughness ◽  
Water Absorption ◽  
Particle Surface ◽  
Surface Profile ◽  
Lightweight Aggregate ◽  
Optical Microscope ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Imagej Software ◽  
Permeation Properties

This paper aims to examine the effect of surface roughness of lightweight aggregate particles (LWA) on the strength and permeation characteristics of lightweight aggregate concrete (LWAC). Changing the smooth surface texture of LWA particles was achieved by applying surface polishing to make rough texture of the aggregate particle surface. LWAC mixes with different LWA surface roughness (smooth and rough) were produced, and their strength and permeation properties were investigated. Cut section method was adopted to measure the surface roughness of LWA particles. The surface profile was measured by using ImageJ software on images captured using the optical microscope (OM) and scanning electron microscope (SEM) with different magnifications. The ability of making the surface of LWA particles rough by polishing them was proved by means of 2D roughness measurements. From the results, it was found that using treated LWA with rough surface helped in enhancing the strength (compressive) and the permeation properties (water absorption and sorptivity) of lightweight aggregate concrete (LWAC). Making the LWA rough helped in improving the compressive strength by about 13.5% owing to enhancing the ITZ between the LWA particles and the cement paste as well as improving the chemical bonding and mechanical interlocking forces between them. In addition, using rough lightweight aggregate led to reduce the water absorption and cumulative volume of water absorbed by about 9% and 12%, respectively, compared to values of mix with original (smooth) LWA.

scholarly journals Mechanical Properties of Chopped Basalt Fiber-Reinforced Lightweight Aggregate Concrete and Chopped Polyacrylonitrile Fiber Reinforced Lightweight Aggregate Concrete

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1715 ◽  
Author(s):  
Yusheng Zeng ◽  
Xianyu Zhou ◽  
Aiping Tang ◽  
Peng Sun
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Shear Strength ◽  
Water Absorption ◽  
Basalt Fiber ◽  
Lightweight Aggregate ◽  
Splitting Tensile Strength ◽  
Lightweight Aggregate Concrete ◽  
Polyacrylonitrile Fiber ◽  
Aggregate Concrete

In this study, an experimental investigation was conducted on the mechanical properties of lightweight aggregate concrete (LWAC) with different chopped fibers, including basalt fiber (BF) and polyacrylonitrile fiber (PANF). The LWAC performance was studied in regard to compressive strength, splitting tensile strength and shear strength at age of 28 days. In addition, the oven-dried density and water absorption were measured as well to confirm whether the specimens match the requirement of standard. In total, seven different mixture groups were designed and approximately 104 LWAC samples were tested. The test results showed that the oven-dried densities of the LWAC mixtures were in range of 1.819–1.844 t/m3 which satisfied the definition of LWAC by Chinese Standard. Additionally, water absorption decreased with the increasing of fiber content. The development tendency of the specific strength of LWAC was the same as that of the cube compressive strength. The addition of fibers had a significant effect on reducing water absorption. Adding BF and PANF into concrete had a relatively slight impact on the compressive strength but had an obvious effect on splitting tensile strength, flexural strength and shear strength enhancement, respectively. In that regard, a 1.5% fiber volume fraction of BF and PANF showed the maximum increase in strength. The use of BF and PANF could change the failure morphologies of splitting tensile and flexural destruction but almost had slight impact on the shear failure morphology. The strength enhancement parameter β was proposed to quantify the improvement effect of fibers on cube compressive strength, splitting tensile strength, flexural strength and shear strength, respectively. And the calculation results showed good agreement with test value.

scholarly journals Impact of Fly Ash on Time-Dependent Properties of Agro-Waste Lightweight Aggregate Concrete

2021 ◽  
Vol 5 (6) ◽  
pp. 156
Author(s):  
Mehdi Maghfouri ◽  
Vahid Alimohammadi ◽  
Pejman Azarsa ◽  
Iman Asadi ◽  
Yashar Doroudi ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Drying Shrinkage ◽  
Lightweight Aggregate ◽  
Time Dependent ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Shrinkage Crack ◽  
Concrete Mixtures

The utilization of by-products and waste materials to substitute for the natural or manufactured resources is considered as a practical way to obtain green building materials. In concrete mixtures, amongst the many available options, Fly Ash (FA) as a by-product pozzolan has been used as a partial replacement of cement. As for the aggregates, lightweight agro-waste oil palm shell (OPS) can be used as a replacement to conventional aggregate for the production of lightweight aggregate concrete. The present communication aims to investigate the impact of FA on time-dependent development properties of OPS lightweight aggregate concrete, including density, water absorption, compressive strength up to 120-days, and drying shrinkage up to the age of 365-days under standard moist curing, partially early curing, and non-curing conditions. Additionally, drying shrinkage crack development was investigated. In this study, two series of concrete mixtures with different substitution levels of OPS (0%, 50%, and 100%) and FA were tested. From the obtained results, it was concluded that the incorporation of fly ash in OPS concrete reduces the density and compressive strength values. Dually, the initial and final water absorption values plus the rate of drying shrinkage at early and long-term ages increased. On top of that, a high potential of drying shrinkage crack, especially for mixtures with 100% OPS, was identified.

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