عوامل مؤثر بر مقاومت فشاري و خمشي ملات سيمان در مجاورت محلول سديمكلريد با استفاده از روش سطح پاسخ

Optimization Effective Factors on Compressive and Flexural Strength of Mortars using Response Surface Method

ﻣﻘﺎوﻣﺖ ﻓﺸﺎري و ﺧﻤﺸﯽ ﻣﻼت از ﻣﻬﻢﺗﺮﯾﻦ ﺧﻮاص ﻣﮑﺎﻧﯿﮑﯽ ﺑﺘﻦ اﺳﺖ و در ﻃﺮح اﺧﺘﻼط ﻣﻼت ﻧﺴﺒﺖ آب ﺑﻪ ﺳﯿﻤﺎن، ﺳﻨﮕﺪاﻧﻪ ﺑﻪ ﺳﯿﻤﺎن و ﻧﻮع رده ﻣﻘﺎوﻣﺘﯽ ﺳﯿﻤﺎن از ﭘﺎراﻣﺘﺮﻫﺎي ﺗﻌﯿﯿﻦﮐﻨﻨﺪه اﯾﻦ ﺧﻮاص اﺳﺖ. اﻣﺮوزه ﻋﻠﻢ ﺑﻬﯿﻨﻪﺳﺎزي در ﻓﻨﺎوري ﺑﺘﻦ و ﻃﺮح اﺧﺘﻼط آن ﻧﻘﺶ ﻣﻬﻤﯽ دارد و ﯾﮑﯽ از روشﻫﺎي آﻣﺎري ﮐﻪ اﺧﯿﺮاً ﺑﻪﻣﻨﻈﻮر ﺑﻬﯿﻨﻪﺳﺎزي ﻣﻮردﺗﻮﺟﻪ ﻣﺤﻘﻘﯿﻦ ﻗﺮارﮔﺮﻓﺘﻪ اﺳﺖ روش ﺳﻄﺢ ﭘﺎﺳﺦ )RSM ( اﺳﺖ ﮐﻪ در اﯾﻦ ﻣﻘﺎﻟﻪ ﺑﺮاي دﺳﺘﯿﺎﺑﯽ ﺑﻪ ﻃﺮح اﺧﺘﻼط ﺑﻬﯿﻨﻪ و ﺑﺮرﺳﯽ ﻋﻮاﻣﻞ ﻣﺆﺛﺮ ﺑﺮ ﺧﻮاص ﮐﯿﻔﯿﺖ ﻣﻼت، از اﯾﻦ روش اﺳﺘﻔﺎدهﺷﺪه اﺳﺖ. در اﯾﻦ راﺳﺘﺎ، 12 ﻃﺮح ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮارﮔﺮﻓﺘﻪاﻧﺪ و ﻧﻤﻮﻧﻪﻫﺎ در ﻣﺠﺎورت ﻣﺤﻠﻮلﻫﺎي ﺣﺎوي 0 ﺗﺎ 5 درﺻﺪ ﺳﺪﯾﻢ ﮐﻠﺮﯾﺪ ﻗﺮارﮔﺮﻓﺘﻪاﻧﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎندﻫﻨﺪه اﻣﮑﺎن ﺑﻪﮐﺎرﮔﯿﺮي اﯾﻦ روش در ﺑﻬﺒﻮد ﻣﺪاوم ﻃﺮح اﺧﺘﻼط ﺑﺘﻦ اﺳﺖ ﮐﻪ ﻣﯽﺗﻮاﻧﺪ ﺑﻪﻋﻨﻮان اﺑﺰاري ﻣﻨﺎﺳﺐ در واﺣﺪﻫﺎي ﺗﻮﻟﯿﺪ ﺑﺘﻦ و واﺣﺪﻫﺎي ﺗﻮﻟﯿﺪ ﻗﻄﻌﺎت ﭘﯿﺶﺳﺎﺧﺘﻪ ﺑﺘﻨﯽ ﻣﻮرداﺳﺘﻔﺎده ﻗﺮار ﮔﯿﺮد. ﺑﺮرﺳﯽ ﻧﺘﺎﯾﺞ ﺑﻬﯿﻨﻪﺳﺎزي ﺑﺎ روش ﺳﻄﺢ ﭘﺎﺳﺦ ﺑﺮاي ﻣﻘﺎوﻣﺖ ﻓﺸﺎري و ﺧﻤﺸﯽ ﻧﺸﺎن ﻣﯽدﻫﻨﺪ ﮐﻪ ﻃﺮح اﺧﺘﻼط ﺑﻬﯿﻨﻪ ﺑﺮاي دﺳﺘﯿﺎﺑﯽ ﺑﻪ ﺑﯿﺸﯿﻨﻪ ﻣﻘﺎوﻣﺖ ﻓﺸﺎري و ﺧﻤﺸﯽ ﻧﻤﻮﻧﻪﻫﺎ، ﻃﺮﺣﯽ ﻣﯽ ﺑﺎﺷﺪ ﮐﻪ در آن درﺻﺪ ﮐﻠﺮ اﺳﺘﻔﺎدهﺷﺪه ﺑﻪ ﻣﯿﺰان 5 درﺻﺪ، رده ﻣﻘﺎوﻣﺘﯽ ﺳﯿﻤﺎن ﻣﻘﺪار ﺑﺎﻻﺗﺮ ﻣﯽﺑﺎﺷﺪ ﮐﻪ ﻣﻘﺪار آن در اﯾﻦ ﻣﻘﺎﻟﻪ 42/5 ﻣﮕﺎﭘﺎﺳﮑﺎل اﺳﺖ و ﻧﺴﺒﺖ ﺳﻨﮕﺪاﻧﻪ ﺑﻪ ﺳﯿﻤﺎن در ﻣﻘﺪار ﺑﯿﺸﺘﺮ و ﻧﺴﺒﺖ آب ﺑﻪ ﺳﯿﻤﺎن ﺣﺪاﻗﻞ ﻣﻘﺪار اﺳﺖ.

Compressive strength and flexural properties of the cement mortar, and Water-cement ratio in the mix design, the ratio of aggregates to cement and cement strength class are the main parameters determining the properties of cement mortar. The optimization of the concrete mix design technology plays an important role, recently statistical method that has been considered by researchers to optimize the response surface methodology (RSM). In this article to achieve an optimal mix of factors affecting the quality of the mortar properties of this method has been used. In this regard, 12 mix design has been evaluated. The samples in the vicinity of solutions containing 0, 5 and 10% sodium chloride are located. The result of the paper represents the possibility of using this method is the continuous improvement of concrete mix design. Which can serve as a useful tool in concrete production units and production units used prefabricated concrete. Search optimization results with response surface method for compressive strength and flexural show that optimal mix design to achieve maximum compressive and flexural strength a mix design which the percentage of chlorine used at a rate of 5%, cement strength class is highest (42.5 MPa) and water to cement ratio is the minimum amount.