基于关键工程性质的地聚合物混合参数响应面优化

IF 1.4 4区 工程技术 Revista de la Construccion Pub Date : 2022-01-01 DOI:10.7764/rdlc.21.3.631
Şevin Ekmen, Kasım Mermerdaş, Z. Alğın, Yusuf Işıker
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引用次数: 1

摘要

本研究的主要目的是研究变基质相特征对粉煤灰轻质地聚合物砂浆(LWGM)的影响。另一个研究范围是通过响应面法(RSM)获得以性能为导向的最佳混合比例。为了实现低单位重量,采用了浮石骨料作为骨料的一部分。研究了其吸水性、干收缩率和导热性等工程性能。通过优化分析,针对不同的输入变量,得到最能代表实验结果的数值模型。降低液(碱)粉(粉煤灰)比、Na2SiO3溶液与NaOH溶液比、增加氢氧化钠的摩尔浓度,均能提高材料的抗压强度。干燥状态下的干导热系数小于饱和状态下的干导热系数。此外,较高的氢氧化钠摩尔浓度和较低的Na2SiO3溶液与NaOH溶液的比、液粉比均可进一步降低收缩率。根据最大抗压强度、最小吸水率和干燥收缩率的目标,确定了物质浓度、SS/SH和l/p因子的最佳值分别为14 M、1.586和0.45。
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Response surface optimization of geopolymer mix parameters in terms of key engineering properties
The main aim of the current study is to search the impact of variable matrix phase features on fly ash based lightweight geopolymer mortars (LWGM). Another scope of the study is to obtain performance oriented optimum mixture proportions through response surface method (RSM). In order to have low unit weight for LWGMs, pumice aggregate was utilized as a part of the aggregate. The investigated engineering properties are water absorption, drying shrinkage and thermal conductivity. By performing optimization analysis, it was aimed to obtain the best numerical models representing the experimental results depending on the input variables. The decrease of liquid (alkali activators) to powder (fly ash) ratio, Na2SiO3 solution to NaOH solution ratio and increase of sodium hydroxide molarity led to improvement of compressive strength. Dry thermal conductivity values in dry state were observed to be less than those of saturated ones. Moreover, the higher sodium hydroxide molarity and lower Na2SiO3 solution to NaOH solution ratios, and liquid to powder ratios resulted in further shrinkage reduction. Depending on the goals of maximum compressive strength, minimum water absorption, and drying shrinkage, optimum values for molarity, SS/SH, and l/p factors were determined as 14 M, 1.586, and 0.45, respectively.
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来源期刊
Revista de la Construccion
Revista de la Construccion 工程技术-工程:土木
CiteScore
2.30
自引率
21.40%
发文量
0
期刊介绍: The Journal of Construction is aimed at professionals, constructors, academics, researchers, companies, architects, engineers, and anyone who wishes to expand and update their knowledge about construction. We therefore invite all researchers, academics, and professionals to send their contributions for assessment and possible publication in this journal. The publications are free of publication charges. OBJECTIVES The objectives of the Journal of Construction are: 1. To disseminate new knowledge in all areas related to construction (Building, Civil Works, Materials, Business, Education, etc.). 2. To provide professionals in the area with material for discussion to refresh and update their knowledge. 3. To disseminate new applied technologies in construction nationally and internationally. 4. To provide national and foreign academics with an internationally endorsed medium in which to share their knowledge and debate the topics raised.
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