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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

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Design And Control Of Concrete Mixtures

With the advancement of technology and the economic crisis in Malaysia, has been promoting the development of infrastructure in the use of new structural materials but overall is unsatisfactory in terms of cost savings. One of the alternatives that can be used is to use fly ash as a cement replacement in manufacturing mortar. Replacement of cement with geopolymerization mortar can reduce manufacturing costs and could reduce global warming arising from the production of cement for the production of Portland cement for the release of CO2 into the atmosphere, where CO2 gas gives the largest contribution to global warming . The study will be focused on the effect of microwave curing with various durations and temperature to the mechanical and physical properties of fly ash based geopolymer mortar. For the conventional heating technique, heat is distributed in the specimen from the exterior to the interior leading to the non-uniform and long heating period to attain the required temperature. Application of microwave to the fresh concrete results in removal of water, collapse of capillary pore and densification of sample. Heat curing has been applied to construction materials especially for the precast concrete to improve the strength development process. This concrete attains sufficient strength in short curing time, so the molds can be reused, and the final products can be rapidly delivered to the site. The effect of curing temperature together with their aging days of the cured product will also be investigated. Mechanical properties of the product will be tested using compressive test, and density of the samples.

Effect of Microwave Curing to the Compressive Strength of Fly Ash Based Geopolymer Mortar

Infrastructure industry is still dominant in developing countries. These activities requires a large number of aggregates. To make cement concrete and asphalt concrete, itrequires60% to 75% of aggregate in total volume of the mixture. This high volume of aggregates may cause reduction on availability of natural aggregate. Another problem is that not all area in Indonesia has the ability to provide adequate aggregates so that it can support the infrastructure development, especially in remote areas. The aggregate mobilization may face disruption. This research attempts to present an idea of creating an artificial aggregate. The artificial aggregate is made of power plant waste that is mixed with alkali silica, named as fly ash geopolymer. Previous study indicates that the use of fly ash geopolymer as filler replacement in asphalt concrete mixture, is able to double the stability of Marshall test. This experiment serves a role to design an artificial aggregate.

/pdf/potential-use-of-fly-ash-base-geopolymeras-aggregate-4oame6rv21.pdf

Potential Use of Fly Ash Base-Geopolymeras Aggregate Substitution in Asphalt Concrete Mixtures

Light weight buildings are required in Indonesia to reduce the risk due to the earthquakes. Therefore, the presence of lightweight materials are needed. Moreover, fly ash that is a waste of coal combustion process, has a basic ingredient of geopolymer binder. If the geopolymer binder is mixed with a foaming agent, it will be a lightweight geopolymer binder, in which it can be used as wall elements that have light weight. Furthermore, the utilization of fly ash will reduces the pollution due to the release of CO2 during production of Portland cement. Thus the use of fly ash results in environmental safety. This study investigate about fibrous lightweight geopolymer binder, in which the main materials used was fly ash with the alkali activator such as NaOH and Na2SiO3. Foaming agent was used to form micro-pores. Abaca fiber was used as a reinforcement to avoid cracks. Normal curing and steamed curing were utilized at temperature 60°C for 6 hours. Meanwhile, tests conducted were compressive strength, density and porosity. Steam curing method resulted an increase in strength and gives less density even though the same amount of pores was formed.

Lightweight Geopolymer Binder with Abaca Fiber in Different Curing

Using Blast Furnace Slag (BFS) with low water-binder ratio in concrete mixture to improve the performance of concrete can cause early-age cracks due to autogeneous shrinkage. In this study, the internal relative humidity (IRH) of mortar under ambient condition was measured by using new proposed method to study the effect of water-binder ratio and BFS in mixture on moisture loss. Decrement of IRH in mortar specimens at low water-binder ratio depends on moisture diffusion and self desiccation. Using BFS in mortar mixture leads lower IRH compare to pure Portland cement.

/pdf/internal-relative-humidity-measurement-on-moisture-mev9fumae0.pdf

Internal relative humidity measurement on moisture distribution of mortar considering self-dessication at early ages

A caution procedure to use embedded sensor to measure internal RH of low W/C ratio mortars is proposed in this paper. Specimens made from OPC mortar and the one made with 40% BFS replacement cured under a sealed condition at 20°C. The results showed higher internal RH decrement when BFS was applied. The slag content, the creation of the early hydrated products, pore structures of OPC mortars introduced with BFS are considered as the main factors.

Januarti Jaya Ekaputri

Papers

Effect of Microwave Curing to the Compressive Strength of Fly Ash Based Geopolymer Mortar

Potential Use of Fly Ash Base-Geopolymeras Aggregate Substitution in Asphalt Concrete Mixtures

Lightweight Geopolymer Binder with Abaca Fiber in Different Curing

Internal relative humidity measurement on moisture distribution of mortar considering self-dessication at early ages

Experimental Study on Internal RH of BFS Mortars at Early Age