The objective of this study is to examine the pattern of water hyacinths which is a plant that is suitable for making lightweight concrete and can be used to replace sand in lightweight concrete production. The proportion of cement: sand: water: foam is 1: 1: 0.65: 44.08 and the proportion of water hyacinths that will replace the sand by the cement’s weight is 0%, 2.5%, 5%, 7.5% and 10%. The density, water absorption, compressive strength (by the standard of TIS 1505-2541) and heat conduction of the lightweight concrete at 14 days will be studied. The results of the compressive strength of the lightweight concrete (LC) and the cellular lightweight concrete (CLC) are 167.56 ksc and 284.94 ksc, respectively. Both the compressive strength of the cellular lightweight concrete mixed water hyacinth (CLCH) and the lightweight concrete mixed water hyacinth (LCH) were investigated. The compressive strength of the CLCH and the LCH are 156.37 ksc and 172.45 ksc, respectively. The results are that the percentage loss of the CLC and the LC compressive strength are 6.68% and 39.83%. As for the physical properties, which are density and thermal conductivity, decreased. In contrast, water absorption increased by the percentage of water hyacinth by sand replacement. The optimal water hyacinth ratio in this study is 5%. Moreover, the CLC block is specified by the Thai Industrial Standards Institute 1505-2541 and is classified as C16 of the CLC block.
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