Scholarlink

Purpose <p>Soil acidification causes a decline in soil health and productivity globally. To combat soil acidification, liming materials capable of neutralizing soil acidity are commonly applied as amendments. Concrete, the most used synthetic material on Earth, has potential as a liming material, and no known studies exist that explore the liming potential of concrete. The objective of this research was to determine the calcium carbonate equivalency (CCE) of concrete to determine if it could be an effective liming material.</p> Methods <p>A factorial experiment was conducted with concrete age and concrete fragment size as factors; the levels of concrete age were New (ca. 1 year old) and Old (ca. 100 years old), and the levels of concrete fragment size were 2–8&#xa0;mm, 0.25–2&#xa0;mm, and &lt; 0.25&#xa0;mm. Four replications of the six treatment combinations were tested using the Indicator Titration Method from ASTM C25-24 Sect. 33.</p> Results <p>Significant differences in CCE were observed between treatments of varying fragment sizes (New 2–8&#xa0;mm = 56 ± 1.6%; Old 2–8&#xa0;mm = 58 ± 6.2%; New 0.25–2&#xa0;mm = 64 ± 4.7%; Old 0.25–2&#xa0;mm = 69 ± 3.0%; New &lt; 0.25&#xa0;mm = 71 ± 1.9%; Old &lt; 0.25&#xa0;mm = 74 ± 3.2%). No significant differences were observed in CCE between different aged concretes. The CCE of concrete was estimated as the weighted sum of the CCE values of the individual concrete constituents, calculated to be 69%, which is comparable to the measured values for the two smaller fragment sizes.</p> Conclusions <p>This study supports the notion that concrete has potential as a liming material and should be explored further as a material to combat soil acidification.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Calcium Carbonate Equivalency and Effective Neutralizing Power of Concrete

  • 期刊论文

  • 发表日期：

    2026年5月30日

查看全文
  • Brittany Multer Hopkins,
  • Rattan Lal

摘要

Purpose

Soil acidification causes a decline in soil health and productivity globally. To combat soil acidification, liming materials capable of neutralizing soil acidity are commonly applied as amendments. Concrete, the most used synthetic material on Earth, has potential as a liming material, and no known studies exist that explore the liming potential of concrete. The objective of this research was to determine the calcium carbonate equivalency (CCE) of concrete to determine if it could be an effective liming material.

Methods

A factorial experiment was conducted with concrete age and concrete fragment size as factors; the levels of concrete age were New (ca. 1 year old) and Old (ca. 100 years old), and the levels of concrete fragment size were 2–8 mm, 0.25–2 mm, and < 0.25 mm. Four replications of the six treatment combinations were tested using the Indicator Titration Method from ASTM C25-24 Sect. 33.

Results

Significant differences in CCE were observed between treatments of varying fragment sizes (New 2–8 mm = 56 ± 1.6%; Old 2–8 mm = 58 ± 6.2%; New 0.25–2 mm = 64 ± 4.7%; Old 0.25–2 mm = 69 ± 3.0%; New < 0.25 mm = 71 ± 1.9%; Old < 0.25 mm = 74 ± 3.2%). No significant differences were observed in CCE between different aged concretes. The CCE of concrete was estimated as the weighted sum of the CCE values of the individual concrete constituents, calculated to be 69%, which is comparable to the measured values for the two smaller fragment sizes.

Conclusions

This study supports the notion that concrete has potential as a liming material and should be explored further as a material to combat soil acidification.