Experimental Study on Nutrient Slow-Release Performance of Nutrient Aggregate Ecological Concrete

doi:10.16552/j.cnki.issn1001-1625.2025.0716

Abstract

Abstract:

Ecological concrete used in riparian environments necessitates needs to enhance nutrient retention capacity， extend fertiliser efficacy cycles， and improve ecological restoration performance. Nutrient slow-release aggregates were prepared using materials containing fertiliser components， which were then substituted for natural coarse aggregates at varying substitution rates of nutrient aggregate to produce nutrient aggregate ecological concrete with different porosities. Tests measured nutrient release amount in aquatic environments， analysing how porosity and nutrient aggregate substitution rates influenced nutrient slow-release performance， mechanical properties， and water permeability of nutrient aggregate ecological concrete. Concurrently， vegetation performance tests were conducted to investigate how slow-release properties of ecological concrete influence vegetation performance. Results indicate that granulated nutrient aggregates effectively reduce nutrient loss through their stable structure. Slurry coating reduces nutrient release rates without blocking nutrient availability， achieving slow-release fertilization and sustain nutrient supply. Nutrient aggregate ecological concrete dynamically regulates nutrient release. Specimens with lower porosity exhibit superior mechanical performance at equivalent substitution rate of nutrient aggregate. Porosity and nutrient aggregate substitution rate can serve as key indicators for regulating the vegetation performance of ecological concrete.

Key words: nutrient aggregate, ecological concrete, porosity, nutrient slow-release, vegetation performance

CLC Number:

TU528.59

LEI Jinsheng, TAN Jiawei, SHI Xiaoyu, LEI Junjie, LIU Jinxin. Experimental Study on Nutrient Slow-Release Performance of Nutrient Aggregate Ecological Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(1): 133-144.

Figures/Tables 18

References 29

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Material	Fineness/%	Setting time/min		Flexural strength/MPa		Compressive strength/MPa
Material	Fineness/%	Initial	Final	3 d	28 d	3 d	28 d
SAC	2.4	15	30	5.7	7.5	38.4	46.2

Material	Fineness/%	Setting time/min		Flexural strength/MPa		Compressive strength/MPa
Material	Fineness/%	Initial	Final	3 d	28 d	3 d	28 d
SAC	2.4	15	30	5.7	7.5	38.4	46.2

Material	Fineness/%	Setting time/min		Flexural strength/MPa		Compressive strength/MPa
Material	Fineness/%	Initial	Final	3 d	28 d	3 d	28 d
OPC	2.1	132	180	5.2	8.8	29.2	54.4

Material	Fineness/%	Setting time/min		Flexural strength/MPa		Compressive strength/MPa
Material	Fineness/%	Initial	Final	3 d	28 d	3 d	28 d
OPC	2.1	132	180	5.2	8.8	29.2	54.4

Material	Particle size/mm	Porosity/%	Apparent density/（ kg·m^-3）	Stacking density/（ kg·m^-3）	Water absorption/%
Crushed stone	5~20	41.3	2 700	1 612	2.1
Crushed stone	10~20	40.9	2 657	1 570	2.1