Prediction of Compressive Strength of Concrete Using the Spearman and PCA-Based BP Neural Network

Table 4

PCA of real-time monitoring data on the mixing-based production of concrete.

Principal component	Characteristic value	Contribution rate (%)	Cumulative contribution rate (%)
	6.7604	75.1154	75.1154
	1.2500	13.8884	89.0038
	0.3458	3.8423	92.8461
	0.2765	3.0724	95.9185
	0.2200	2.4443	98.3628
	0.0819	0.9096	99.2724
	0.0493	0.5475	99.8199
	0.0162	0.1801	100.0000