Abstract
This present paper aims to investigate strength characteristics of cement mortar using natural sea sand as fine aggregate in different curing conditions. Research was carried out with making mortar mixtures by two types of cement, Portland Composite Cement (PCC) and Pozzolana Portland Cement (PPC) with tap water as mixing water. Characteristics of fine aggregate and strength of cement mortar use river sand (RS), sea sand (SS), and washed sea sand (WS) were observed. Further, specimens of cube mortar in size of 50 mm x 50 mm x 50 mm of six mortar mixture series were casted according to Indonesian Standard. At 24 hours after cube specimens were casted, cube mortar specimens were cured in three curing conditions such as tap water curing (TC), seawater curing (SC) and air curing (AC). After curing at certain period (3-day, 7-day, 14-day, and 28-day), cube mortar samples were tested in compressive strength. Results concluded that sea sand aggregate improve characteristic of mortar in compressive strength up to 28 days in all curing conditions, and there was no significant effect of type of curing water (TC and SC) on 28-day strength performance of mortar was obtained. In addition, sea sand could potentially be utilized as an aggregate in production of mortar and/or concrete.
Highlights
Indonesia is a large archipelago country in the world that consists of 17.580 islands with a coastline of 81.000 km
It suggests that consistency of mortar mixed by river sand (RS), sea sand (SS), and washed sea sand (WS) is not affected by type of cement (PCC and Pozzolana Portland Cement (PPC)) and type of sand (SR, SS, and WS)
No significance difference was obtained in initial setting time of Portland Composite Cement (PCC) sea sand mortar (CM-SS) and PCC washed sea sand mortar (CM-WS)
Summary
Indonesia is a large archipelago country in the world that consists of 17.580 islands with a coastline of 81.000 km. This geographical condition leads a lot of demand for development of infrastructures, such as ports, road pavements, bridges, etc. Reported that concrete has generally become used material for construction which is about 30 billion tons used annually. Aggregate is mainly material for mix concrete, which are reached aggregate proportion in concrete approximately 75% - 80% [3]. Properties of aggregate are can limit the compressive strength of concrete, and aggregate properties greatly affect durability of concrete [4]. The properties and chemical content of sand aggregate and water are important characteristics to develop strength and durability of concrete [5]
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