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        Investigation of Properties of Lightweight Concrete with Calcined Diatomite Aggregate

        Patcharapol Posi,Surasit Lertnimoolchai,Vanchai Sata,Tanakorn Phoo-ngernkham,Prinya Chindaprasirt 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5

        This paper reports the investigation of the properties of Lightweight Concrete (LWC) made from Portland cement and diatomiteaggregate. The chemical and physical properties of diatomite and the mechanical properties of LWC with regard to the effects ofcalcined temperature and gradation were studied. The uncalcined diatomite was crushed and calcined at 400, 600, and 800°C for 4hours and used as lightweight aggregate. A constant Water to Cement ratio (W/C) of 2.0 and Aggregate to Cement ratio (A/C) of 1.6were used for all mixes. The 28-day compressive strength of LWC of 6.4-11.9 MPa, porosity and water absorption of 34.0-49.4%,modulus of elasticity of 2.0-4.3 GPa, thermal conductivity of 0.166-0.192 W/mK, and unit weight of 1170-1300 kg/m3 wereobtained. The results indicated that the strength of concrete increased when the calcined temperature of diatomite and the amount ofsmall-size aggregate were increased. The increase in temperature ridded the burnable elements and improved the properties ofdiatomite. The small-size aggregate produced good matrix-aggregate bonding and enhanced the strength of concrete. The calcineddiatomite could, therefore, be used as good aggregate in making lightweight concrete.

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        Structural Lightweight Concrete Containing Recycled Lightweight Concrete Aggregate

        Athika Wongkvanklom,Patcharapol Posi,Banlang Khotsopha,Chetsada Ketmala,Natdanai Pluemsud,Surasit Lertnimoolchai,Prinya Chindaprasirt 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8

        In this paper, Structural Lightweight Concrete (SLC) containing Recycled Lightweight Aggregate (RLA) is described. Damagedlightweight concrete was used as RLA by crushing it into fine particles, and used to replace fine limestone aggregate of up to 45% byweight. To enhance the strength development of SLC, silica fume and a superplasticizer were incorporated into the mixture. Thecompressive strength, density, water absorption, porosity, modulus of elasticity, and thermal conductivity of the concrete were tested. The results show that SLC with satisfactory 28-day compressive strengths of between 16.5 and 30.5 MPa, and densities of between1600 and 1800 kg/m3, were obtained. The compressive strength, modulus of elasticity, and thermal conductivity decreased with anincrease in RLA content, and the water absorption and porosity increased. Water absorption of 3.28–7.87%, porosity of 6.82–13.87%, modulus of elasticity of 16.5–25.2 GPa, and thermal conductivity of 0.49–0.75 W/mK were found to be within the workingrange of SLC.

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