Effect of elevated temperature on the properties of silica fume and recycled rubber-filled high strength concretes (RHSC)

Peer review under responsibility of Housing and Building National Research Center.

Figures & data

Fig. 1 Fine and coarse rubber used in present research study.

Fig. 2 Sieve analysis of gravel and dolomite aggregates.

Fig. 3 Sieve analysis of sand and rubber.

Table 1 Composition of concretes (kg/m³).

Group	Mixes^∗∗	Cement	Silica Fume	Water	Sp.^∗	Coarse agg.			Sand	Rubber
						Gravel (20 mm)	Dolomite			Fine (2 mm)	Coarse (5 mm)
							Size 1	Size 2
І	MS0-G	500	–	150	10	1260	–	–	630	–	–
	MS10-G	450	50	150	10	1260	–	–	630	–	–
	MS15-G	425	75	150	12.5	1260	–	–	630	–	–
	MS20-G	400	100	150	15	1260	–	–	630	–	–
П	MS20-D-R0	400	100	150	12	–	440	880	440	–	–
	MS20-D-R3	388	100	150	12	–	440	880	440	12	–
	MS20-D-R5	380	100	150	12	–	440	880	440	20	–
	MS20-DRC3	388	100	150	12	–	440	880	440	–	12

Mix^∗∗ code: MX##-Y-P#; Sp.^∗: Superplasticizer.

MX = concrete mix with silica fume.

## = silica fume ratio of cement weight %.

Y = G for gravel, D for dolomite aggregate.

P = R for fine rubber, R_C for coarse rubber.

# = ratio of rubber by weight of cement %.

Fig. 4 Effect of silica fume % on compressive strength with increasing temperature.

Fig. 5 Retained compressive strength % with increasing temperature (different SF %).

Fig. 6 Effect of coarse aggregate type on compressive strength with increasing temperature.

Fig. 7 Retained compressive strength % with increasing temperature (different aggregates).

Fig. 8 Compressive, rupture and tensile strength of rubber-filled HSC at room temperature.

Fig. 9 Effect of rubber content % on compressive strength with increasing temperature.

Fig. 10 Retained compressive strength % with increasing temperature (different rubber %).

Fig. 11 Specimens with different % of rubber after heating to 600, 800 °C.

Fig. 12 Effect of rubber % on weight loss % of concrete with increasing temperature.