Lightweight self-consolidating concrete at high temperatures

U radu su prikazani rezultati eksperimentalnog ispitivanja laganog samozbijajućeg betona s dodatkom kokosovih ljuski krupnom agregatu, pod utjecajem visokih temperatura. Nakon izlaganja betona temperaturi od 800 °C, zabilježene su promjene svojstava betona, poput tlačne čvrstoće i gubitka težine. Istraživanje je provedeno na uzorcima betona s dodatkom kokosovih ljuski u različitim omjerima kao zamjenu za krupni agregat. Za pripremanje mješavina betona upotrijebljeni su pepeo rižinih ljuski i silikatna prašina. Rezultati su pokazali da se svojstva očvrsnulog betona smanjuju na temperaturama većim od 400 °C.Results of experimental investigation of the lightweight self-consolidating concrete subjected to elevated temperatures, with coconut shells added to coarse aggregate, are presented in this paper. Variations in the concrete properties, such as the compressive strength and weight loss, were observed after the concrete was subjected to the temperature of 800 °C. The investigation was carried out on concrete samples with varying proportions of coconut shells. The rice husk ash and silica fume were used to develop two reference concrete mixtures. The results show that the properties of hardened concrete decrease at temperatures of more than 400 °C

Lightweight self-consolidating concrete at high temperatures

U radu su prikazani rezultati eksperimentalnog ispitivanja laganog samozbijajućeg betona s dodatkom kokosovih ljuski krupnom agregatu, pod utjecajem visokih temperatura. Nakon izlaganja betona temperaturi od 800 °C, zabilježene su promjene svojstava betona, poput tlačne čvrstoće i gubitka težine. Istraživanje je provedeno na uzorcima betona s dodatkom kokosovih ljuski u različitim omjerima kao zamjenu za krupni agregat. Za pripremanje mješavina betona upotrijebljeni su pepeo rižinih ljuski i silikatna prašina. Rezultati su pokazali da se svojstva očvrsnulog betona smanjuju na temperaturama većim od 400 °C.Results of experimental investigation of the lightweight self-consolidating concrete subjected to elevated temperatures, with coconut shells added to coarse aggregate, are presented in this paper. Variations in the concrete properties, such as the compressive strength and weight loss, were observed after the concrete was subjected to the temperature of 800 °C. The investigation was carried out on concrete samples with varying proportions of coconut shells. The rice husk ash and silica fume were used to develop two reference concrete mixtures. The results show that the properties of hardened concrete decrease at temperatures of more than 400 °C

Permeability properties of lightweight self-consolidating concrete made with coconut shell aggregate

Liquid substance intrusion into concrete is one of the issues that gradually damage its phys- ical and structural integrity. The permeability properties of lightweight self-consolidating concrete containing coconut shell aggregate was investigated in this study. A partial replace- ment of crushed rock (granite) with coconut shell from 0 to 100% in step of 25% was considered for the mixtures. Rice husk ash (RHA) and Silica fume (SF) were considered for developing binary and ternary blended self-consolidating concrete with total powder content of 450 kg/m3 and 550 kg/m3. The testing of concrete involved the saturated water absorption, sorptivity and chloride ingress, which were used to examine the permeability properties of the concrete developed. The laboratory investigations showed encouraging results with better performance up to 75% replacement of crushed granite with coconut shell aggregate