Dredged marine sand as constructive material
Dredged marine sand as constructive material
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DOI：
10.5150/jngcgc.2010.095-l
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Jussara Limeira de Araujo;L. A. Fité;M. Larrañaga
中科院分区：
文献类型：
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作者：
Jussara Limeira de Araujo;L. A. Fité;M. Larrañaga
疏浚工程通常需要在世界各地的许多港口的维护活动，并代表了大量的处置材料。疏浚集料的使用可以考虑在侵蚀过程控制、海岸稳定、海滩补给、建筑材料（粘土、砖、集料）生产或建筑工程（地基填料、堤坝等）等几个应用中使用。研究揭示了疏浚海砂（DMS）在建造基础和底基港口路面中的可行性，将这种材料与水硬性粘合剂混合物（水泥或石灰）结合，以改善骨料的级配并纠正颗粒骨架。其主要目的是改善填料并获得岩土工程应用所需的压缩性能。在这项工作中，DMS从港口的圣卡洛斯-德拉拉皮塔（塔拉戈纳，西班牙）作为建筑材料的研究。分析了其对净浆、砂浆和混凝土生产的影响。一旦确定DMS的化学和物理特性，就进行两个实验阶段。首先，使用CEM II/A-M 42，5 R水泥，不同百分比的DMS代替原砂和增塑剂添加剂，以获得所研究的混合物的新鲜和硬化性能，制成浆体和砂浆。此后，DMS作为细骨料用于混凝土生产。在工业规模生产的混凝土港口路面上进行了试验。混凝土的新鲜和硬化性能进行了测定，并与控制混合。结果表明，DMS作为建筑材料，在混凝土中作为精细的修正砂时，表现出令人满意的性能。
Dredging works are usually required to maintenance activities in many ports all over the world and represents a huge volume of disposal material. The use of dredged aggregates can be considered in several applications as erosive process control, coastal stabilization, beach replenishment, production of construction materials (clay, bricks, aggregates) or construction works (foundation fill, dikes, etc.). Researches revealed the feasibility of dredged marine sand (DMS) in the construction of base and sub-base harbour pavements incorporating this material to hydraulic binder mixes (cement or lime) in order to improve the grading of aggregates and correct the granular skeleton. Its main objective is to improve the packing and to obtain the compressive properties required for geotechnical applications. In this work the study of DMS from the Port of Sant Carles de la Rapita (Tarragona, Spain) as construction material is presented. The analysis of its influence on paste, mortar and concrete production is described. Two experimental phases were carried out once chemical and physical characteristics of DMS were determined. At first, pastes and mortars were made using CEM II/A-M 42,5R cement, different percentages of DMS on replacement of raw sand and plasticizer additive in order to obtain fresh and hardened properties of the mixes studied. After that, DMS was used in the production of concretes as fine aggregates. A pilot experience was carried out with concrete port pavements produced in industrial scale. Fresh and hardened properties of the concretes were determined and compared to the control mix. Results show satisfactory behaviour of DMS as construction material when incorporated in concrete as fine corrective sand.