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Gold Science and Technology >

2022 , Vol. 30 >Issue 2: 243 - 253

DOI: https://doi.org/10.11872/j.issn.1005-2518.2022.02.082

Mining Technology and Mine Management

Study on Proportion and Mechanical Properties of Geopolymer Concrete

  • Qin DING , 1 ,
  • Ming TAO , 1 ,
  • Xiang LI 2
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  • 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China
  • 2. School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, Guangdong, China

Received date: 2021-06-30

  Revised date: 2021-11-19

  Online published: 2022-06-17

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Highlights

Concrete is an important building material in roadway support，but there are often quality problems in roadway construction，such as honeycomb surface，cracks，holes and large area damage，which need to be repaired in order not to affect the normal production.Geopolymer concrete has the characteristics of fast setting time，high early strength，strong interface bonding ability，low permeability，high temperature resistance，frost resistance，corrosion resistance，excellent durability and low energy consumption，low pollution and low cost in the preparation process，and has the potential to be used as concrete repair materials.At present，there is no consensus on the proportion design of geopolymer concrete.The fly ash and slag were activated using sodium silicate and sodium hydroxide as alkalin-activator solution for the preparation of geopolymer mortar.The effects of different alkali-activator modulus （1.0，1.2，1.4） and content （10%，15%，20%） on the mechanical properties of mortar at different ages （3 d，7 d，28 d） were studied.The results show that the modulus and content of alkali-activator have a significant effect on the mechanical properties of geopolymers.Too large or too small alkali-activator modulus and content are not conducive to the strength development of geopolymer mortar.When the ratio of fly ash to slag is 1∶1，the modulus of water glass is 1.2，the content of alkali is 15%，the flexural and compressive strength of geopolymer mortar reaches the best value.The 28 d flexural strength is 7.6 MPa，the 28 d compressive strength is 72.3 MPa.In order to further explore the mechanical properties of geopolymer concrete with different mix ratios，the orthogonal experiment with three factors and three levels was designed to study the effects of different water-binder ratio （0.45，0.50，0.55），fly ash content （30%，50%，70%） and sand ratio （30%，35%，40%） on the workability and mechanical properties of geopolymer concrete at different ages （7 d，28 d）.Taking the compressive strength as the evaluation index，the results show that fly ash content has the most significant effect on compressive strength，followed by water-binder ratio，and sand ratio has almost no effect on strength development.The results of variance analysis of 7 d and 28 d show that the content of fly ash has a highly significant effect on the compressive strength of geopolymer concrete，the water-binder ratio has a significant effect on the compressive strength of geopolymer concrete，but the sand ratio has no significant effect on the compressive strength of geopolymer concrete.Considering the workability and mechanical properties of geopolymer concrete，combined with the results of microstructure analysis，geopolymer concrete with water-binder ratio of 0.50 and fly ash content of 50% is a promising rapid repair material.

Cite this article

Qin DING , Ming TAO , Xiang LI . Study on Proportion and Mechanical Properties of Geopolymer Concrete[J]. Gold Science and Technology, 2022 , 30(2) : 243 -253 . DOI: 10.11872/j.issn.1005-2518.2022.02.082

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利用金属切削废料制作低成本金属3D打印粉末

近期，印度科学研究所（IISc）的研究人员发现，金属加工领域产生的切屑废料在精炼后的性能与常见气雾化粉末一样好，能够满足金属增材制造（SLM技术）的使用要求。

切屑通常作为废品丢弃。它通常呈细丝状，就像金属碎片一样，但它有时候也会呈现出完美的球形颗粒。由机械工程系助理教授Koushik Viswanathan领导的IISc研究小组发现，这小部分球形粉末颗粒是由于在切削过程中表面层的氧化（放热反应）产生的高热而熔化的结果。然后，他们改进了这一工艺以生产大量球形粉末，这些粉末被收集并进一步加工，用作增材制造的原料。他们的研究表明，这些颗粒在金属增材制造方面的性能与商业气体雾化粉末一样好。该工艺可用作生产金属粉末的替代技术。

IISc产品设计和制造中心的博士生、该研究的作者之一Priti Ranjan Panda补充说：“我们有一种替代的、低成本和可调控的制造金属粉末的方法，以及保证最终粉末的高质量。与传统的气体雾化粉末相比，这似乎非常具有竞争力。”

Viswanathan解释说：“最近人们对采用金属增材制造产生了浓厚的兴趣，因为从本质上讲，它可以实现大量定制并允许设计自由。然而，现有金属粉末的高昂成本一直是绊脚石。我们希望我们的工作将为制造更便宜、更容易获得的金属粉末打开新的大门。”

机械系博士生Harish Singh Dhami（本研究的参与者）补充说：“降低增材制造工艺的成本（通过经济的粉末）可以扩大材料范围，例如制造生物医学植入物，这可能变得更便宜、更容易获得。”

研究人员表示，使用磨损制造金属粉末在其他高性能应用中也具有潜力，例如飞机发动机，在这些应用中需要高度的特异性和复杂性。

用于3D打印的传统金属粉末存在缺陷。AM的主要来源材料是金属粉末，主要使用称为雾化的技术生产，其中熔融金属流使用空气或水射流分解成细小液滴。

然而，尽管它被广泛使用，但雾化的产量很低，价格昂贵，而且它可以处理的材料类型不灵活。然而，这种新技术回避了这些问题。

http://www.goldsci.ac.cn/article/2022/1005-2518/1005-2518-2022-30-2-243.shtml

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