Pretreatment of Sawdust for Producing Sawdust Concrete

Abstract

Sawdust concrete has some shortcomings due to the harmful effects of some organic soluble components existing in the sawdust which affects setting and strength of sawdust concrete. Also, volume changes of sawdust as an aggregate due to variation of moisture content, cause large volume changes in the sawdust concrete. In this work, sawdust was treated before using as an aggregate for making sawdust concrete. The treatment included boiling the sawdust in water containing hydrated lime in order to dissolve all soluble organic components. To reduce water absorption of sawdust, it was dried and treated with waterproofing material. Two types of waterproofing materials were used (cutback asphalt and classic varnish). The properties of sawdust concrete were highly improved using pretreated sawdust. The increase of compressive strength was up to 50% for moderate sawdust ratios. Flexural strength is also increased, water absorption and thermal conductivity were highly reduced, while the basic advantages of sawdust concrete such as lightness of weight, sawability and nailability were not affected. ‫اﻟﺧﺷب‬ ‫ﻧﺷﺎرة‬ ‫ﺧرﺳﺎﻧﺔ‬ ‫اﻧﺗﺎج‬ ‫ﻓﻲ‬ ‫ﻟﻠﻧﺷﺎرة‬ ‫اﻟﻣﺳﺑﻘﺔ‬ ‫اﻟﻣﻌﺎﻟﺟﺔ‬ ‫اﻟﺧﻼﺻﺔ‬ ‫ﺧرﺳﺎﻧﺔ‬ ‫ﺑب‬ ‫ﺑﺳ‬ ‫ﻠﺑﯾﺎت‬ ‫اﻟﺳ‬ ‫ﺑﻌض‬ ‫ﻟﮭﺎ‬ ‫اﻟﺧﺷب‬ ‫ﻧﺷﺎرة‬ ‫ض‬ ‫ﺑﻌ‬ ‫ﻰ‬ ‫ﻋﻠ‬ ‫ﺎرة‬ ‫اﻟﻧﺷ‬ ‫واء‬ ‫اﺣﺗ‬ ‫ﺎرة‬ ‫اﻟﺿ‬ ‫واد‬ ‫اﻟﻣ‬ ‫اﻟﻣﺎء‬ ‫ﻓﻲ‬ ‫ﻟﻠذوﺑﺎن‬ ‫اﻟﻘﺎﺑﻠﺔ‬ ‫و‬ ‫اﻟﻌﺿوﯾﺔ‬ ‫اﻟطﺑﯾﻌﺔ‬ ‫ذات‬ ‫ﺗﺻ‬ ‫ﻰ‬ ‫ﻋﻠ‬ ‫ﺗؤﺛر‬ ‫واﻟﺗﻲ‬ ‫ﺎرة‬ ‫ﻧﺷ‬ ‫ﺎﻧﺔ‬ ‫ﺧرﺳ‬ ‫ﺔ‬ ‫ﻣﻘﺎوﻣ‬ ‫و‬ ‫ﻠب‬ ‫اﻟﺧﺷب‬. ‫رات‬ ‫ﺗﻐﯾ‬ ‫ﺑب‬ ‫ﺗﺳ‬ ‫ﺎ‬ ‫ﻓﯾﮭ‬ ‫ﺔ‬ ‫اﻟرطوﺑ‬ ‫وى‬ ‫ﻣﺣﺗ‬ ‫ر‬ ‫ﺗﻐﯾ‬ ‫ن‬ ‫ﻋ‬ ‫ﺔ‬ ‫اﻟﻧﺎﺟﻣ‬ ‫ﺎرة‬ ‫ﻟﻠﻧﺷ‬ ‫اﻟﺣﺟﻣﯾﺔ‬ ‫اﻟﺗﻐﯾرات‬ ‫ان‬ ‫ﻛﻣﺎ‬ ‫اﻟﺧرﺳﺎﻧﺔ‬ ‫ﻓﻲ‬ ‫ﺣﺟﻣﯾﺔ‬ ‫اﻟﻧﺷﺎرة‬ ‫ھذه‬ ‫ﻋﻠﻰ‬ ‫ﺗﺣﺗوي‬ ‫اﻟﺗﻲ‬. ‫ل‬ ‫ﻗﺑ‬ ‫ب‬ ‫اﻟﺧﺷ‬ ‫ﺎرة‬ ‫ﻧﺷ‬ ‫ﺔ‬ ‫ﻣﻌﺎﻟﺟ‬ ‫ﺗﻣت‬ ‫اﻟﺑﺣث‬ ‫ھذا‬ ‫ﻓﻲ‬ ‫اﻟﺧرﺳﺎﻧﺔ‬ ‫ﻓﻲ‬ ‫ﻛرﻛﺎم‬ ‫اﺳﺗﺧداﻣﮭﺎ‬. ‫ﺔ‬ ‫اﻟﻣﻌﺎﻟﺟ‬ ‫ﺔ‬ ‫ﻋﻣﻠﯾ‬ ‫ﺗﺿﻣﻧت‬ ‫ﻲ‬ ‫ﻏﻠ‬ ‫ﺎ‬ ‫اﻟﻧﺷ‬ ‫ر‬ ‫اﻟﺟﯾ‬ ‫ﻰ‬ ‫ﻋﻠ‬ ‫وي‬ ‫ﯾﺣﺗ‬ ‫ﺎء‬ ‫ﻣ‬ ‫ﻲ‬ ‫ﻓ‬ ‫رة‬ ‫ﺄ‬ ‫اﻟﻣطﻔ‬ ‫رض‬ ‫ﻟﻐ‬ ‫ﺎرة‬ ‫اﻟﻧﺷ‬ ‫ﻲ‬ ‫ﻓ‬ ‫ودة‬ ‫اﻟﻣوﺟ‬ ‫ﺎرة‬ ‫اﻟﺿ‬ ‫واد‬ ‫اﻟﻣ‬ ‫ل‬ ‫ﻛ‬ ‫ن‬ ‫ﻣ‬ ‫ﺗﺧﻠص‬ ‫اﻟ‬ ‫و‬ ‫ﺔ‬ ‫اذاﺑ‬. ‫ل‬ ‫ﺗﻘﻠﯾ‬ ‫رض‬ ‫وﻟﻐ‬ ‫ﻟﻠﻣﺎء‬ ‫اﻟﻧﺷﺎرة‬ ‫اﻣﺗﺻﺎص‬ ، ‫ﻟﻠرطوﺑﺔ‬ ‫ﻣﺎﻧﻌﺔ‬ ‫ﺑﻣواد‬ ‫ﺗﺟﻔﯾﻔﮭﺎ‬ ‫ﺑﻌد‬ ‫اﻟﻧﺷﺎرة‬ ‫ﻣﻌﺎﻟﺟﺔ‬ ‫ﺗﻣت‬. ‫وﻋﯾن‬ ‫ﻧ‬ ‫ﺗﺧدام‬ ‫اﺳ‬ ‫م‬ ‫ﺗ‬ ‫اﻟﻣواد‬ ‫ﻣن‬ ‫و‬ ‫ري‬ ‫اﻟﻘﯾ‬ ‫ت‬ ‫اﻟزﻓ‬ ‫ﺎ‬ ‫وھﻣ‬ ‫ﺔ‬ ‫ﻟﻠرطوﺑ‬ ‫اﻟﻣﺎﻧﻌﺔ‬ ‫ورﻧﯾش‬ ‫اﻟ‬ ‫اﻟﺗﻘﻠ‬ ‫دي‬ ‫ﯾ‬. ‫ان‬ ‫د‬ ‫وﺟ‬ ‫ث‬ ‫اﻟﺑﺣ‬ ‫ﻼل‬ ‫ﺧ‬ ‫ن‬ ‫ﻣ‬ ‫و‬ ‫ﺔ‬ ‫ﻣﻌﺎﻟﺟ‬ ‫ﺎرة‬ ‫ﻧﺷ‬ ‫ﺗﺧدام‬ ‫ﺑﺎﺳ‬ ‫ر‬ ‫ﻛﺑﯾ‬ ‫ﻛل‬ ‫ﺑﺷ‬ ‫ﺗﺣﺳﻧت‬ ‫اﻟﺧﺷب‬ ‫ﻧﺷﺎرة‬ ‫ﺧرﺳﺎﻧﺔ‬ ‫ﺧواص‬ ‫ﺔ‬ ‫ﻣﻘﺎوﻣ‬ ‫ت‬ ‫ارﺗﻔﻌ‬ ‫ث‬ ‫ﺣﯾ‬ ‫دو‬ ‫ﺑﺣ‬ ‫ﻐﺎط‬ ‫اﻻﻧﺿ‬ ‫د‬ ٥٠ % ‫ﺎرة‬ ‫اﻟﻧﺷ‬ ‫ن‬ ‫ﻣ‬ ‫طﺔ‬ ‫ﻣﺗوﺳ‬ ‫ب‬ ‫ﻧﺳ‬ ‫ط‬ ‫ﺑﺧﻠ‬. ‫ﻛ‬ ‫ﺎء‬ ‫اﻟﻣ‬ ‫ﺎص‬ ‫اﻣﺗﺻ‬ ‫ﺑﺔ‬ ‫ﻧﺳ‬ ‫ﺎن‬ ‫ﻓ‬ ‫ك‬ ‫ذﻟ‬ ‫ﻛل‬ ‫ﺑﺷ‬ ‫ت‬ ‫ﻗﻠ‬ ‫ﺔ‬ ‫اﻟﺣﺟﻣﯾ‬ ‫رات‬ ‫واﻟﺗﻐﯾ‬ ‫وظ‬ ‫ﻣﻠﺣ‬ ، ‫اﻻﺳ‬ ‫زات‬ ‫اﻟﻣﯾ‬ ‫و‬ ‫ﺎت‬ ‫اﻻﯾﺟﺎﺑﯾ‬ ‫ﺄﺛر‬ ‫ﺗﺗ‬ ‫م‬ ‫ﻟ‬ ‫ﺎ‬ ‫ﺑﯾﻧﻣ‬ ‫ﺎﻧﺔ‬ ‫ﻟﺧرﺳ‬ ‫ﯾﺔ‬ ‫ﺎﺳ‬ ‫اﻟﺧﺷب‬ ‫ﻧﺷﺎرة‬-‫ﻓﯾﮭﺎ‬ ‫اﻟﻣﺳﺎﻣﯾر‬ ‫دق‬ ‫و‬ ‫ﺑﺎﻟﻣﻧﺷﺎر‬ ‫ﻗﺻﮭﺎ‬ ‫اﻣﻛﺎﻧﯾﺔ‬ ‫و‬ ‫اﻟوزن‬ ‫ﻛﺧﻔﺔ‬-‫ﺔ‬ ‫ﺟ‬ ‫ﻟ‬ ‫ﺎ‬ ‫ﻌ‬ ‫ﻣ‬ ‫ﻟ‬ ‫ﺎ‬ ‫ﺑ‬ .