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American Society for Testing and Materials

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Properties Of Concrete

Construction and demolition waste generation and properties of recycled aggregate concrete: A global perspective

A critical review and assessment for usage of recycled aggregate as sustainable construction material

Thank you for reading design and control of concrete mixtures. Maybe you have knowledge that, people have look numerous times for their chosen books like this design and control of concrete mixtures, but end up in infectious downloads. Rather than enjoying a good book with a cup of tea in the afternoon, instead they cope with some infectious virus inside their desktop computer. design and control of concrete mixtures is available in our digital library an online access to it is set as public so you can download it instantly. Our book servers saves in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Kindly say, the design and control of concrete mixtures is universally compatible with any devices to read.

Design And Control Of Concrete Mixtures

This paper studies the effect of curing temperature and curing duration to the flood mud based geopolymer on compressive strength properties. Flood mud was used as a raw material for geopolymer and geopolymer samples were synthesized by using sodium silicate and sodium hydroxide 14M solution. These samples were cured at different temperature (100°C, 150°C, 200°C and 250°) for different curing duration (6h, 12h and 24h) respectively. Compressive strength tests were carried out at after 28 days. The compressive strength and SEM analysis of geopolymer products were evaluated. Result showed that the maximum compressive strength was 24 MPa at temperature of 150°C for 24 hours. With increasing ageing day, densification of geopolymer gel was observed.

Flood Mud as Geopolymer Precursor Materials: Effect of Curing Regime on Compressive Strength

This paper is study about using paper filter Whatman no.42 for measuring water retention on cement paste. The research is conducted as experiment in laboratory by making two types of specimens. The first speciment is cement paste with variation of water cement ratio and the second one is foam cement paste. There are two step for measuring water retention on cement paste. The first step is specimen immersed with immersion duration (t1). The second step is searching of filter paper weight to obtain water content after contact with two specimen. t1is time of consistency water content on specimens. The parameters (t1) must be searched before measuring water retention. The result of measurement water retention be shown in a curve.

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Study of Using Paper Filter Whatman no.42 for Measuring Water Retention in Cement Paste

AbstractSkid resistance is required to prevent vehicle wheels from slipping on a road surface. The skid resistance is influenced by surface texture of the road, which is a function of aggregate properties and grading characteristics. This study aimed to examine the effect of using artificial aggregates on the texture depth and the skid resistance of two asphalt concrete surface course (ACSC) mixtures (dense and open graded). The artificial aggregate, which was made from a mixture of a locally sourced fly ash geopolymer paste and an alkaline activator, was used to partially substituting the coarse aggregate in these ACSC mixtures. ACSC slab samples, without and with 25% artificial aggregate, were produced in laboratory. The texture depth and skid resistance characteristics were subsequently determined. This study found that the differences in texture depth and skid resistance of the two ACSC mixtures were contributed by the difference in gradation of the mixtures and the properties of the coarse aggregate in the mixtures. The ACSC mixture containing 100% natural coarse aggregate (crushed stone) has a deeper and rougher texture depth than those containing 25% rounded artificial aggregate. Post-wheel track loading, the texture depth and skid resistance of open graded ACSC were found to be higher than those of dense graded ACSC. These trends were consistent regardless the type of aggregates used in these ACSC samples. Overall, all tested samples showed skid resistance values meeting the requirements for heavily trafficked roads in urban areas where the traffic speed does not exceed 95 km/h.KeywordsArtificial aggregateAsphalt concreteGeopolymerSkid resistanceTexture depth 

Texture and Skid Resistance of Asphalt Concrete Surface Course Incorporating Geopolymer Artificial Aggregates

The drying cycle can affect embankments based ontheir physical properties and induce soil cracks. This paper investigates the unsaturated physical behavior of material from ﬂood embankments located at the Bengawan Solo River, Pelangwot village, Bojonegoro, East Java, Indonesia. The volumetric shrinkage and degree of compactedness of the soil are important factors that control the soil behavior due to dry conditions. Some tests were conducted to study the desiccation process, in which soil samples were placed in a circular desiccation plate with soil thickness of 10 mm and a 100 mm plate diameter. A water retention curve was obtained to analyze the material properties during shrinkage. Next, the effect of the drying process on geometric characteristics of crack patterns was analyzed by image processing. Then, photo records of cracked soil from laboratory tests were assessed to determine the soil crack intensity via a Fuzzy C-Means (FCM) method using MATLAB software. The image analysis results show that the geometric characteristics of crack patterns were influenced by the drying process with a decrease in water content at 10% intervals until the air-dried condition was achieved. This is consistent with field observations; this indicates that image processing can be used quantitatively to analyze the drying process dependency of soil cracking behavior.

Cracked soils behavior due to drying conditions using a fuzzy c-means method

This paper presents the experimental study on the penetration of chloride ions in fly ash based-geopolymer concrete in the salt-water. To determine the corrosion possibility of reinforcement, lollipop-shape specimens with the size of 10x10x15 cm were prepared with the plain steel bar in the middle of concrete. The specimens were exposed to chloride ion penetration for 30-120 days. The mixtures were varied with alkali concentration of 8M-12M with the mass ratio of Na2SiO3 to NaOH was varied from 1.5 to 2.5. Specimens made with portland cement concrete was also prepared as the control. The best performance was showed by specimens made with 12M of NaOH. Due to ion exchange on the surface of geopolymer concrete, less chloride ion was found in geopolymer made with high alkali concentration. After 90 days, Portland cement concrete showed less performance while geopolymer concrete showed the strength increasing. High binding capacity due to soluble silicate content in geopolymer concrete was one of the reasons why geopolymer specimens are more resistant to chloride ion penetration.

https://iopscience.iop.org/article/10.1088/1757-899X/615/1/012114/pdf

Januarti Jaya Ekaputri

Papers

Flood Mud as Geopolymer Precursor Materials: Effect of Curing Regime on Compressive Strength

Study of Using Paper Filter Whatman no.42 for Measuring Water Retention in Cement Paste

Texture and Skid Resistance of Asphalt Concrete Surface Course Incorporating Geopolymer Artificial Aggregates

Cracked soils behavior due to drying conditions using a fuzzy c-means method

The effect of alkali concentration on chloride penetration in geopolymer concrete