ﺗﺎﺛﯿﺮ ﻧﻮع ﺳﻨﮕﺪاﻧﻪ ﻫﺎ ﺑﺮ وﯾﮋﮔﯽ ﻫﺎي ﻣﻘﺎوﻣﺘﯽ ﺑﺘﻦ ﮔﻮﮔﺮدي و ﻣﻌﻤﻮﻟﯽ

Effect of type and texture of aggregates on strength properties of sulfur concrete and portland concrete

ﺑﺘﻦ ﮐﻪ ﭘﺮﮐﺎرﺑﺮدﺗﺮﯾﻦ ﻣﺎده در ﺳﺮاﺳﺮ ﺟﻬﺎن ﺑﺮاي ﺳﺎﺧﺖ ﺳﺎزهﻫﺎ ﻣﯽﺑﺎﺷﺪ. در ﺑﯿﻦ ﺧﺼﻮﺻﯿﺎت ﺑﺘﻦ، ﻣﻘﺎوﻣﺖ ﺑﺘﻦ ﯾﮑﯽ از وﯾﮋﮔﯽ ﻫﺎﯾﯽ ﻣﯽ ﺑﺎﺷﺪ ﮐﻪ ﺑﯿﺸﺘﺮﯾﻦ ارزش را در ﺑﯿﻦ ﻣﻬﻨﺪﺳﺎن و ﻃﺮاﺣﺎن دارد و از اﯾﻦ رو ﺑﺎ ﻧﺴﺒﺖ ﮐﯿﻔﯽ ﺑﺎﻻﯾﯽ ﮐﻨﺘﺮل ﻣﯽﺷﻮد. ﺑﺘﻦ از ﺗﺮﮐﯿﺐ ﭼﻨﺪﯾﻦ ﻣﺼﺎﻟﺢ ﺷﺎﻣﻞ ﺳﯿﻤﺎن، ﺳﻨﮕﺪاﻧﻪ، ﻣﻮاد اﻓﺰودﻧﯽ و آب ﺗﺸﮑﯿﻞ ﺷﺪه اﺳﺖ. ﺗﻘﺮﯾﺒﺎً %75 ﺣﺠﻢ ﺑﺘﻦ ﻣﺘﻌﺎرف را ﺳﻨﮕﺪاﻧﻪﻫﺎ ﺗﺸﮑﯿﻞ ﻣﯽدﻫﻨﺪ ﺑﺪﯾﻬﯽ اﺳﺖ ﻣﺎده ﻣﺘﺸﮑﻠﻪاي ﮐﻪ ﭼﻨﯿﻦ درﺻﺪ ﺑﺰرﮔﯽ از ﺑﺘﻦ را ﺗﺸﮑﯿﻞ ﻣﯽدﻫﺪ ﺑﺎﯾﺪ ﻧﻘﺶ ﻣﻬﻤﯽ در ﺧﻮاص ﺑﺘﻦ ﺗﺎزه و ﺳﺨﺖ ﺷﺪه داﺷﺘﻪ ﺑﺎﺷﺪ. در اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﻪ ﻣﻨﻈﻮر ﺑﺮرﺳﯽ ﺗﺄﺛﯿﺮ وﯾﮋﮔﯽﻫﺎي اﻧﻮاع ﺳﻨﮕﺪاﻧﻪﻫﺎ ﺑﺮ ﺑﺘﻦﻫﺎي ﮔﻮﮔﺮدي و ﻣﻌﻤﻮﻟﯽ از 7 ﻧﻤﻮﻧﻪ ﺳﻨﮕﯽ ﮐﻪ ﺷﺎﻣﻞ ﻣﺼﺎﻟﺢ ﻣﻌﻤﻮﻟﯽ، ﮔﺮاﻧﯿﺖ، 2 ﻧﻤﻮﻧﻪ آﻫﮏ، ﻟﻮﻣﺎﺷﻞ، ﺗﺮاورﺗﻦ و ﻟﯿﮑﺎ اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. از اﯾﻦ ﻧﻤﻮﻧﻪﻫﺎي ﺳﻨﮕﯽ، ﺳﻨﮕﺪاﻧﻪﻫﺎﯾﯽ ﺑﺎ داﻧﻪﺑﻨﺪي ﯾﮑﺴﺎن ﺗﻬﯿﻪ و وﯾﮋﮔﯽﻫﺎي ﻓﯿﺰﯾﮑﯽ و ﻣﮑﺎﻧﯿﮑﯽ ﻧﻤﻮﻧﻪﻫﺎ ﺑﺪﺳﺖ آﻣﺪه اﺳﺖ. در ﻣﺮﺣﻠﻪ ﺑﻌﺪ ﻃﺮح اﺧﺘﻼط ﻣﻨﺎﺳﺒﯽ ﻣﺸﺨﺺ ﮔﺮدﯾﺪ ﮐﻪ ﺑﺮاي ﻫﺮ 2 ﻧﻮع ﺑﺘﻦ ﻣﻌﻤﻮﻟﯽ و ﮔﻮﮔﺮدي ﻗﺎﺑﻞ اﺳﺘﻔﺎده ﺑﺎﺷﺪ و ﺳﭙﺲ ﻧﻤﻮﻧﻪﻫﺎ ﺳﺎﺧﺘﻪ ﺷﺪه و ﺑﺮرﺳﯽ ﻧﺘﺎﯾﺞ ﻧﺸﺎن داده اﺳﺖ ﮐﻪ ﻣﺼﺎﻟﺢ ﺳﻨﮕﯽ ﮐﻪ ﺑﺮاي اﺳﺘﻔﺎده در ﺑﺘﻦ ﻣﻌﻤﻮﻟﯽ ﻣﻨﺎﺳﺐ ﻧﻤﯽﺑﺎﺷﻨﺪ در ﺑﺘﻦﻫﺎي ﮔﻮﮔﺮدي ﺑﺎ ﺗﻐﯿﯿﺮاﺗﯽ ﮐﻪ در ﻃﺮح اﺧﺘﻼط داده ﺷﺪ، ﻣﻘﺎوﻣﺖ ﻣﻨﺎﺳﺒﯽ را ﮐﺴﺐ ﮐﺮده، ﺑﻪ ﻋﻨﻮان ﻣﺜﺎل ﻟﻮﻣﺎﺷﻞ از ﻣﻘﺎوﻣﺖ MPa 17/6 در ﺑﺘﻦﻫﺎي ﻣﻌﻤﻮﻟﯽ ﺑﻪ MPa 43/6 در ﺑﺘﻦﻫﺎي ﮔﻮﮔﺮدي رﺳﯿﺪه اﺳﺖ. ﻫﻤﭽﻨﯿﻦ ﺗﺨﻠﺨﻞ و ﺑﺎﻓﺖ ﺳﻄﺤﯽ ﺳﻨﮕﺪاﻧﻪﻫﺎ در ﺑﺘﻦﻫﺎي ﮔﻮﮔﺮدي ﻧﻘﺶ ﭘﺮرﻧﮕﺘﺮي دارﻧﺪ.

Concrete is the most widely used materials in construction throughout the world. Among its properties, strength is the most important, controlled with utmost care by engineers and designers. Concrete is made of different materials: aggregate, water, cement and admixture. Aggregate occupies approximately 75% of the concrete mass; as a result it definitely has an important role in the properties of fresh and hardened concrete. In this research, in order to study the effect of different aggregates in sulfur and conventional concrete, 7 types of rock have been selected including River material, Granite, 2 types of Limestone, Coquina , Travertine and expanded clay. Having designed the machine, the aggregate was prepared from these rock types; then the physical and mechanical characteristics of the samples were determined. After selecting an appropriate mix design which could be applied to both types of concrete, samples were prepared and investigation showed that weak aggregates which are not used in conventional concrete, can, with changes in the mix design, be used in sulfur concrete and provide the needed strength(Coquina that gained 17.6 MPa in conventional concrete reach to 43.6 MPa in sulfur concrete). Furthermore, texture and porosity play an important role in sulfur compared to conventional concrete.