Experimental Investigation on Mechanical Properties of Hybrid Steel and Polyethylene Fiber-Reinforced No-Slump High-Strength Concrete

Table 5

Test results of compressive and flexural strength.

	Compressive strength										Flexural strength
	7 days (MPa)					28 days (MPa)					28 days (MPa)					Toughness index
	Mean	COV	Test results			Mean	COV	Test results			Mean	COV	Test results
U16.4-NF	90.9	4.0%	92.9	85.9	94.1	120.9	4.3%	126.8	114.3	121.5	6.0	29.0%	8.3	5.6	4.1	—	—	—
U16.8-NF	89.1	2.3%	90.9	86.2	90.2	109.1	2.3%	109.2	105.9	112.1	3.6	18.6%	4.3	3.7	2.7	—	—	—
U17.2-NF	91.9	0.6%	92.1	91.2	92.4	122.0	1.8%	125.0	119.7	121.3	5.7	15.7%	5.3	4.9	6.9	—	—	—
U16.4-18PE1.5	80.9	4.7%	80.3	76.6	85.7	121.9	4.5%	120.1	129.4	116.2	15.3	4.0%	15.8	15.5	14.4	4.9	11.0	43.3
U16.8-18PE1.5	79.0	4.2%	83.3	75.2	78.5	120.8	3.1%	125.0	116.0	121.4	15.2	15.4%	18.2	14.7	12.6	5.2	11.2	41.9
U17.2-18PE1.5	81.0	1.5%	82.3	81.3	79.4	124.9	0.1%	125.0	124.7	125.0	23.1	19.3%	23.1	28.6	17.7	5.3	12.2	62.2
U16.4-PP1.5	81.2	1.7%	80.9	79.7	83.1	116.2	3.1%	118.9	111.1	118.4	19.6	17.0%	13.4	20.5	16.8	4.9	10.4	32.4
U17.2-PP1.5	81.9	1.6%	80.2	83.3	82.1	117.3	1.6%	119.5	117.2	115.0	22.1	11.6%	19.2	24.3	22.8	5.5	11.8	48.4
U16.4-12SP0.5	86.0	3.9%	82.5	85.0	90.6	123.2	0.7%	122.9	124.5	122.3	19.0	8.6%	20.3	28.1	19.5	5.5	17.1	71.1
U17.2-12SP0.5	86.3	5.0%	82.6	92.3	84.0	123.4	0.3%	123.9	123.1	123.1	21.9	8.5%	24.1	19.6	22.1	5.4	12.2	58.8
U16.4-18SP1.0	85.9	1.5%	80.9	79.7	83.1	123.3	0.7%	122.0	123.9	123.9	14.7	5.1%	13.9	14.3	15.8	4.8	11.2	51.5
U17.2-18SP1.0	86.0	1.6%	80.2	83.3	82.1	122.9	3.5%	128.4	122.2	118.1	18.5	10.5%	21.0	18.3	16.3	5.3	15.7	59.3

Note: mean = mean value of test strength; COV = coefficient of variation.