Improvement of Mechanical Properties in Polypropylene- and Glass-Fibre-Reinforced Peach Shell Lightweight Concrete

Table 4

Compressive strength of concretes.

Mix	Compressive strength (MPa)				% increase in compressive strength (28 days)
	3 days	7 days	28 days	56 days
Control	16.8 (68.3%)	22.6 (91.9%)	24.6	26.3 (106.9%)	—
PP25	17.6 (66.2%)	23.3 (87.6%)	26.6	27.6 (103.8%)	8.1
PP50	19.1 (70.7%)	23.7 (87.8%)	27.0	28.5 (105.6%)	9.8
PP75	19.2 (68.3%)	24.4 (86.8%)	28.1	28.8 (102.5%)	14.2
G25	18.7 (71.6%)	23.6 (90.4%)	26.1	27.3 (104.6%)	6.1
G50	21.0 (74.5%)	25.1 (89.0%)	28.2	29.3 (103.9%)	14.6
G75	21.5 (73.4%)	25.5 (87.0%)	29.3	30.2 (103.1%)	19.1

Note. Values in brackets denote the percentages of compressive strength to the corresponding 28-day compressive strength.